WO2004004899A1 - 排ガス浄化用触媒の製造方法 - Google Patents
排ガス浄化用触媒の製造方法 Download PDFInfo
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- WO2004004899A1 WO2004004899A1 PCT/JP2003/008440 JP0308440W WO2004004899A1 WO 2004004899 A1 WO2004004899 A1 WO 2004004899A1 JP 0308440 W JP0308440 W JP 0308440W WO 2004004899 A1 WO2004004899 A1 WO 2004004899A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- alumina
- composite oxide
- type composite
- exhaust gas
- solution
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 128
- 239000003054 catalyst Substances 0.000 title claims abstract description 118
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 310
- 239000002131 composite material Substances 0.000 claims abstract description 299
- 239000000203 mixture Substances 0.000 claims abstract description 174
- 239000000843 powder Substances 0.000 claims abstract description 151
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 90
- 229910052746 lanthanum Inorganic materials 0.000 claims description 105
- 239000007789 gas Substances 0.000 claims description 99
- 239000013078 crystal Substances 0.000 claims description 81
- 150000004703 alkoxides Chemical class 0.000 claims description 72
- 150000003839 salts Chemical class 0.000 claims description 51
- 238000002156 mixing Methods 0.000 claims description 40
- 229910052763 palladium Inorganic materials 0.000 claims description 38
- 125000004432 carbon atom Chemical group C* 0.000 claims description 29
- 238000000746 purification Methods 0.000 claims description 24
- 229910052742 iron Inorganic materials 0.000 claims description 21
- 125000000217 alkyl group Chemical group 0.000 claims description 19
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 229910052703 rhodium Inorganic materials 0.000 claims description 13
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 12
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 12
- 229910052697 platinum Inorganic materials 0.000 claims description 12
- 229910052779 Neodymium Inorganic materials 0.000 claims description 10
- 229910052727 yttrium Inorganic materials 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 7
- 125000003118 aryl group Chemical group 0.000 claims description 7
- 125000003709 fluoroalkyl group Chemical group 0.000 claims description 7
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 7
- 125000003545 alkoxy group Chemical group 0.000 claims description 6
- 125000004429 atom Chemical group 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- KPPVNWGJXFMGAM-UUILKARUSA-N (e)-2-methyl-1-(6-methyl-3,4-dihydro-2h-quinolin-1-yl)but-2-en-1-one Chemical compound CC1=CC=C2N(C(=O)C(/C)=C/C)CCCC2=C1 KPPVNWGJXFMGAM-UUILKARUSA-N 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 30
- 238000000034 method Methods 0.000 abstract description 30
- 230000003197 catalytic effect Effects 0.000 abstract description 12
- 230000007423 decrease Effects 0.000 abstract description 8
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 252
- 239000000243 solution Substances 0.000 description 144
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 110
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 98
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- 239000008367 deionised water Substances 0.000 description 60
- 229910021641 deionized water Inorganic materials 0.000 description 60
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 58
- 238000003756 stirring Methods 0.000 description 58
- 239000002002 slurry Substances 0.000 description 46
- 239000011259 mixed solution Substances 0.000 description 43
- 239000007864 aqueous solution Substances 0.000 description 41
- 239000010948 rhodium Substances 0.000 description 41
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 32
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 32
- 238000009423 ventilation Methods 0.000 description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 26
- 239000002244 precipitate Substances 0.000 description 25
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 23
- 229910052726 zirconium Inorganic materials 0.000 description 21
- 238000011068 loading method Methods 0.000 description 20
- 229910052788 barium Inorganic materials 0.000 description 19
- 238000001035 drying Methods 0.000 description 19
- 229910052684 Cerium Inorganic materials 0.000 description 18
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 18
- 230000007062 hydrolysis Effects 0.000 description 18
- 238000006460 hydrolysis reaction Methods 0.000 description 18
- 229910015187 FePd Inorganic materials 0.000 description 17
- -1 caseida Chemical class 0.000 description 17
- 238000010304 firing Methods 0.000 description 17
- 239000000047 product Substances 0.000 description 17
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 16
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 15
- 229910018967 Pt—Rh Inorganic materials 0.000 description 15
- 229910002651 NO3 Inorganic materials 0.000 description 13
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 13
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 13
- 229910052878 cordierite Inorganic materials 0.000 description 13
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 13
- 239000012266 salt solution Substances 0.000 description 13
- 239000011572 manganese Substances 0.000 description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 10
- 239000011575 calcium Substances 0.000 description 10
- 229910052791 calcium Inorganic materials 0.000 description 9
- 239000000446 fuel Substances 0.000 description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- IXSUHTFXKKBBJP-UHFFFAOYSA-L azanide;platinum(2+);dinitrite Chemical compound [NH2-].[NH2-].[Pt+2].[O-]N=O.[O-]N=O IXSUHTFXKKBBJP-UHFFFAOYSA-L 0.000 description 8
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 8
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 7
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 239000011268 mixed slurry Substances 0.000 description 7
- 229910017604 nitric acid Inorganic materials 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000001354 calcination Methods 0.000 description 6
- 229910052749 magnesium Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 description 6
- 229910052712 strontium Inorganic materials 0.000 description 6
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000003960 organic solvent Substances 0.000 description 5
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- 229910000029 sodium carbonate Inorganic materials 0.000 description 5
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 description 5
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
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- 239000003795 chemical substances by application Substances 0.000 description 4
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- 238000004090 dissolution Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 230000003472 neutralizing effect Effects 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- 125000002524 organometallic group Chemical group 0.000 description 4
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 4
- 231100000572 poisoning Toxicity 0.000 description 4
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- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 4
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- 239000006104 solid solution Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- UAEJRRZPRZCUBE-UHFFFAOYSA-N trimethoxyalumane Chemical compound [Al+3].[O-]C.[O-]C.[O-]C UAEJRRZPRZCUBE-UHFFFAOYSA-N 0.000 description 4
- KLFRPGNCEJNEKU-FDGPNNRMSA-L (z)-4-oxopent-2-en-2-olate;platinum(2+) Chemical compound [Pt+2].C\C([O-])=C\C(C)=O.C\C([O-])=C\C(C)=O KLFRPGNCEJNEKU-FDGPNNRMSA-L 0.000 description 3
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
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- CFYGEIAZMVFFDE-UHFFFAOYSA-N neodymium(3+);trinitrate Chemical compound [Nd+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O CFYGEIAZMVFFDE-UHFFFAOYSA-N 0.000 description 3
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- JKDRQYIYVJVOPF-FDGPNNRMSA-L palladium(ii) acetylacetonate Chemical compound [Pd+2].C\C([O-])=C\C(C)=O.C\C([O-])=C\C(C)=O JKDRQYIYVJVOPF-FDGPNNRMSA-L 0.000 description 3
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- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 description 2
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- IGRCZGNAQXWXMV-UHFFFAOYSA-N acetyl acetate;rhodium Chemical compound [Rh].CC(=O)OC(C)=O IGRCZGNAQXWXMV-UHFFFAOYSA-N 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
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- 238000005191 phase separation Methods 0.000 description 2
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- LCLCVVVHIPPHCG-UHFFFAOYSA-N 5,5-dimethylhexane-2,4-dione Chemical compound CC(=O)CC(=O)C(C)(C)C LCLCVVVHIPPHCG-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
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- 101100194322 Caenorhabditis elegans rei-1 gene Proteins 0.000 description 1
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- 125000005594 diketone group Chemical group 0.000 description 1
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- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QAMFBRUWYYMMGJ-UHFFFAOYSA-N hexafluoroacetylacetone Chemical compound FC(F)(F)C(=O)CC(=O)C(F)(F)F QAMFBRUWYYMMGJ-UHFFFAOYSA-N 0.000 description 1
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- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
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- UYXRCZUOJAYSQR-UHFFFAOYSA-N nitric acid;platinum Chemical compound [Pt].O[N+]([O-])=O UYXRCZUOJAYSQR-UHFFFAOYSA-N 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
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- 150000003057 platinum Chemical class 0.000 description 1
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- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 description 1
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 1
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- SONJTKJMTWTJCT-UHFFFAOYSA-K rhodium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Rh+3] SONJTKJMTWTJCT-UHFFFAOYSA-K 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 159000000008 strontium salts Chemical class 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 150000003754 zirconium Chemical class 0.000 description 1
- ATYZRBBOXUWECY-UHFFFAOYSA-N zirconium;hydrate Chemical compound O.[Zr] ATYZRBBOXUWECY-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
- C01P2002/52—Solid solutions containing elements as dopants
- C01P2002/54—Solid solutions containing elements as dopants one element only
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
- C01P2006/13—Surface area thermal stability thereof at high temperatures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S502/00—Catalyst, solid sorbent, or support therefor: product or process of making
- Y10S502/525—Perovskite
Definitions
- the present invention relates to a method for producing an exhaust gas purifying catalyst, and more particularly, to a method for producing an exhaust gas purifying catalyst containing a perovskite-type composite oxide used as an exhaust gas purifying catalyst.
- Pt (platinum) and Rh (rhodium) have been used as three-way catalysts that can simultaneously purify carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (Nx) contained in exhaust gas.
- a perovskite-type composite oxide carrying a noble metal such as Pd (palladium) is known.
- Such Berobusukai preparative composite oxide is represented by the general formula AB 0 3, it can be expressed in a good good catalytic activity of noble metal supported.
- an aqueous solution obtained by mixing a heat-resistant composite oxide powder with a nitrate of a metal constituting the perovskite-type composite oxide at a predetermined stoichiometric ratio is used. in addition, dried for about 1 0 0 ° C in 5-1 2 hour, further, by 3 calcined 0 hour 7 0 0 to 8 0 0 S C, heat-resistant composite oxide of Berobusukai preparative composite oxide It has been proposed to be carried on objects.
- the method for producing a purification catalyst for exhaust gas of the present invention comprises the steps of: preparing a pre-crystal composition containing an element component constituting a perovskite-type composite oxide containing a noble metal; And / or a step of preparing a mixture by mixing with ⁇ -alumina powder, and a step of heat-treating the mixture.
- the Beguchi buskite-type composite oxide is one represented by the general formula (1).
- A represents at least one element selected from rare earth elements and alkaline earth metals
- B represents a transition element excluding rare earth elements and noble metals
- N represents a noble metal
- m represents an atomic ratio of N in a numerical range of 0 ⁇ m ⁇ 0-5.
- N in the general formula (1) is selected from the group consisting of Rh, Pd and Pt. It is preferable that at least one kind is selected.
- the perovskite-type composite oxide represented by the above general formula (1) is a Rh-containing perovskite-type composite oxide represented by the following general formula (2), and represented by the following general formula (3) It is preferably at least one selected from the group consisting of a Pd-containing perovskite-type composite oxide and a Pt-containing perovskite-type composite oxide represented by the following general formula (4).
- A represents at least one element selected from L a, N d, Y, A ′ represents C e and ⁇ or Pr, and B represents F e, Mn, A 1 Represents at least one element selected, p represents the atomic ratio of A 'in the numerical range of 0 ⁇ p ⁇ 0.5, and q represents the atom of Rh in the numerical range of 0 ⁇ ci ⁇ 0.8. Indicates the ratio.
- A represents at least one element selected from La, Nd, and Y, ⁇ represents at least one element selected from Fe, Mn, and A1, and r represents 0 ⁇ r ⁇ 0.5 indicates the atomic ratio of Pd in the numerical range of 0.5.
- A represents at least one element selected from La, Nd, and Y, and ⁇ ′ represents at least one element selected from Mg, Ca, Sr, Ba, and Ag.
- B represents at least one element selected from Fe, Mn, and A 1
- B ′ represents at least one element selected from Rh and Ru
- s represents 0 ⁇ s ⁇ 0.5 indicates the atomic ratio of A 'in the numerical range of t
- t indicates the atomic ratio of B' in the numerical range of 0 ⁇ t ⁇ 0.5
- u indicates the atomic ratio of 0 ⁇ u ⁇ 0.5 Shows the atomic ratio of Pt in the numerical range.
- the 0-alumina and / or ⁇ -alumina is represented by the following general formula (5).
- the pre-crystal composition may be a solution containing an alkoxide of an element component constituting the perovskite-type composite oxide other than the noble metal, and a solution containing the organometallic salt of the noble metal. Is preferably prepared by mixing
- the organometallic salt of the noble metal is a / 3-diketone compound or a / 3-ketoester compound represented by the following general formula (6) and Z, or represented by the following general formula (7)] It is preferably a complex of a noble metal formed from a 3-dicarboxylic acid ester compound.
- R 3 is an alkyl group having 1 to 6 carbon atoms, a fluoroalkyl group or an aryl group having 1 to 6 carbon atoms
- R 4 is an alkyl group having 1 to 6 carbon atoms
- a fluoroalkyl having 1 to 6 carbon atoms A group, an aryl group or an alkyloxy group having 1 to 4 carbon atoms
- R 5 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- R 6 represents an alkyl group having 1 to 6 carbon atoms
- R 7 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- a perovskite-type composite oxide is supported on alumina and Z or a-alumina powder.
- the composite oxide is stable, has a small decrease in specific surface area, and can sufficiently secure the heat resistance of the belovskite-type composite oxide. Therefore, a decrease in catalyst performance can be effectively prevented.
- the method for producing an exhaust gas purifying catalyst according to the present invention comprises the steps of: This is a method for producing an exhaust gas purifying catalyst by supporting a g-type composite oxide on 0-alumina and Z or ⁇ -alumina.
- base mouth Busukai preparative-type composite oxide containing a noble metal is represented by the general formula ⁇ has Bae Robusukai Bok structure represented by 0 3, composite oxides having free precious metals as composition (i.e. This does not include the case where a noble metal is later supported on the belovskite-type composite oxide.)
- ⁇ has Bae Robusukai Bok structure represented by 0 3
- composite oxides having free precious metals as composition i.e. This does not include the case where a noble metal is later supported on the belovskite-type composite oxide.
- it is represented by the following general formula (1).
- A represents at least one element selected from rare earth elements and alkaline earth metals
- B represents a transition element excluding rare earth elements and noble metals
- N indicates a noble metal
- m indicates an atomic ratio of N in a numerical range of 0 ⁇ m ⁇ 0.5.
- the rare earth element represented by A for example, Sc (scandium), Y (yttrium), La (lanthanum), Ce (cerium), Pr (praseodymium), N d (neodymium), Pm (promethium), Sm (samarium), Eu (europium), Gd (gadolinium), Tb (terbium), Dy (dysprosium), Ho (holmium), Er (e) Rubidium), Tm (thulium), Yb (ytterbium), and Lu (lutetium).
- alkaline earth metal represented by A examples include, for example, Be (beryllium), Mg (magnesium), Ca (calcium), Sr (strontium), Ba (barium), and Ra (radium). And the like. These may be used alone or in combination of two or more.
- the element number 22 (T i) to the atom Number 30 (Zn), atomic number 40 (Zr) to atomic number 48 (Cd), and atomic number 72 (Hf) to atomic number 80 (Hg) (Except for noble metals (atomic numbers 44 to 47 and 76 to 78)). These may be used alone or in combination of two or more.
- the transition elements other than the rare earth elements and noble metals represented by B and A 1 are preferably Ti (titanium), Cr (chromium), Mn (manganese), Fe (iron), and Co (cobalt). , Ni (nickel), Cu (copper), Zn (zinc) and A 1 (aluminum).
- the noble metal represented by N for example, Ru (ruthenium), Rh (rhodium), Pd (palladium), Ag (silver), O s (osmium), Ir (Iridium), Pt (platinum) and the like.
- Ru ruthenium
- Rh rhodium
- Pd palladium
- Ag silver
- O s osmium
- Ir Iridium
- Pt platinum
- Rh, Pd, and Pt are mentioned. These may be used alone or in combination of two or more.
- m is a numerical range of 0 ⁇ m ⁇ 0.5, that is, N is an essential component, and the atomic ratio of N is less than 0.5, and the atomic ratio of B is 0.5 or more. It is.
- N in the general formula (1) is R h,? (It is preferably at least one selected from the group consisting of 1 and 1;
- a Rh-containing perovskite-type composite oxide represented by the following general formula (2) is preferably used.
- A represents at least one element selected from La, Nd, and Y
- a ′ represents Ce and / or Pr
- B represents Fe
- Mn A1
- p indicates the atomic ratio of A, in the numerical range of 0 ⁇ p ⁇ 0.5
- ci indicates the atom of R h in the numerical range of 0 ⁇ q ⁇ 0.8. Indicates the ratio.
- the noble metal when it is Pd, it contains Pd represented by the following general formula (3).
- Verovskite-type composite oxides are preferably used.
- A represents at least one element selected from La, Nd, and Y, ⁇ represents at least one element selected from Fe, Mn, and A1, and r represents 0 ⁇ r ⁇ 0.5 indicates the atomic ratio of Pd in the numerical range of 0.5.
- a Pt-containing perovskite-type composite oxide represented by the following general formula (4) is preferably used.
- A represents at least one element selected from L a, N d, and Y
- a ′ is M g , C a, S r, B a, and at least one element selected from A g
- B represents at least one element selected from F e, Mn
- a 1 and B ′ represents R h
- Ru represents at least one element selected from the group consisting of s
- s represents the atomic ratio of A 'in the numerical range of 0 ⁇ s ⁇ 0.5
- t represents the atomic ratio of 0 ⁇ t ⁇ 0.5
- u represents the atomic ratio of Pt in the numerical range of 0 to u ⁇ 0.5.
- 0-alumina has a ⁇ phase as a crystal phase and is a kind of intermediate (transition) alumina before transition to ⁇ -alumina.
- a-alumina activated alumina
- Such 0-alumina is obtained, for example, by subjecting S PHERAL ITE 531 P (trade name, ⁇ ⁇ ⁇ ⁇ -alumina, manufactured by Prokia-Lize Co., Ltd.) to heat treatment at 100 ° C. for 1 to 10 hours in the air. And the like.
- ⁇ -alumina has an ⁇ -phase as a crystal phase, and examples thereof include ⁇ -53 (trade name, high-purity alumina, manufactured by Sumitomo Chemical Co., Ltd.).
- Such ⁇ alumina can be obtained by a method such as an alkoxide method, a sol-gel method, and a coprecipitation method.
- the 0-alumina and / or a-alumina may contain La and / or Ba, that is, those represented by the following general formula (5) are preferably used.
- D represents L a and Z or B a
- g represents an atomic ratio of D satisfying 0 ⁇ g ⁇ 0.5.
- D represents La and / or Ba
- the atomic ratio of D represented by g ranges from 0 to 0.5. That is, La and Ba are not essential components but optional components that are arbitrarily included, and if included, have an atomic ratio of 0.5 or less. If the atomic ratio of La or Ba exceeds 0.5, the crystal phase may not be able to maintain the 0 phase and the Z or a phase.
- La and Ba to alumina and Z or alumina
- it can also be obtained by impregnating 0 alumina and / or ⁇ alumina with a solution of a La or Ba salt, followed by drying and firing.
- such alumina and / or ⁇ -alumina preferably have a specific surface area of 5 m 2 / g or more, and more preferably 10 m 2 / g or more.
- a plurality of L a B a having different atomic ratios can be used in combination.
- the weight ratio of the perovskite-type composite oxide supported on 6-alumina and / or alumina is not particularly limited.
- 0 alumina and Z or ⁇ -alumina are used. Is 0.5 to 20 parts by weight, preferably 0.5 to 10 parts by weight. If the amount of 0 alumina and / or ⁇ -alumina is less than this, bevelskite-type composite oxidation In some cases, the effect of dispersing the substances becomes insufficient, and grain growth cannot be suppressed in a high-temperature atmosphere. If the amount of e-alumina and Z or ⁇ -alumina is larger than this, cost and production may be disadvantageous.
- the method for producing an exhaust gas purifying catalyst of the present invention comprises preparing a pre-crystal composition containing an element component constituting the above-mentioned noble metal-containing belovskite-type composite oxide, and the pre-crystal composition and the above-mentioned pre-crystal composition.
- ⁇ Mix the powder with alumina and / or Q! Alumina to prepare a mixture, and then heat treat the mixture.
- the pre-crystal composition is crystallized, and the noble metal-containing perovskite-type composite oxide is supported on alumina and / or ⁇ -alumina.
- Such production methods can be more specifically classified into a coprecipitation method, a citrate complex method, an alkoxide method, and the like.
- a mixed salt aqueous solution containing a salt of each of the above-mentioned elements (element components) at a predetermined stoichiometric ratio is prepared, and then a neutralizing agent is added to coprecipitate.
- a coprecipitate pre-crystal composition
- drying and heat-treating the dried product pre-crystal composition
- the pre-crystal composition before heat treatment is added to ⁇ alumina and And / or mix alpha alumina powder.
- the salt of each element examples include inorganic salts such as sulfate, nitrate, chloride and phosphate, and organic salts such as acetate and oxalate.
- the mixed salt aqueous solution can be prepared, for example, by adding a salt of each element to water at a ratio so as to have a predetermined stoichiometric ratio, and stirring and mixing.
- the neutralizing agent examples include organic bases such as ammonia, triethylamine, pyridine and the like, and inorganic bases such as caseida, casei, potassium carbonate and ammonium carbonate.
- organic bases such as ammonia, triethylamine, pyridine and the like
- inorganic bases such as caseida, casei, potassium carbonate and ammonium carbonate.
- the obtained coprecipitate is washed with water if necessary, and dried by, for example, vacuum drying or ventilation drying to obtain a dried product.
- the dried product is mixed with a solution of a noble metal organometallic salt to prepare a uniform mixing slurry, and the uniformly mixed slurry is dried to obtain a dried product (pre-crystal composition). .
- the mixture is prepared by adding a crab, if necessary, as a slurry or a solution, and the mixture is prepared, for example, at about 500 to 100 ° C, preferably at about 600 to 950 ° C.
- citrate is mixed with a salt of each of the above-described elements (elemental components) so that the salt of each of the above-described elements has a predetermined stoichiometric ratio.
- An aqueous salt solution (pre-crystal composition) is prepared, and then the aqueous solution of citrate mixed salt is dried to form a dried product (pre-crystal composition) of the above-described citrate complex of each element.
- powder of 0 alumina and / or ⁇ -alumina is mixed with the pre-crystal composition before heat treatment.
- Examples of the salt of each element include the same salts as described above, and the aqueous citrate mixed salt solution is prepared, for example, by preparing an aqueous mixed salt solution in the same manner as described above, and adding the aqueous solution of citrate to the aqueous mixed salt solution.
- Drying removes water at a temperature at which the formed citrate complex does not decompose, for example, at room temperature to about 150 ° C. Thereby, a dried product of the citric acid complex of each element described above can be obtained.
- a mixed aqueous solution of citrate of each element except for the noble metal was prepared and dried to form a citrate complex. Then, a solution of an organic metal salt of the noble metal was mixed with a heat-treated product of the citrate complex. To prepare a uniform mixed slurry, and then dry the uniform mixed slurry to obtain a dried product (pre-crystal composition). You.
- the powder of 0 alumina and Z or a alumina is converted into at least one of an aqueous solution of mixed salt of citrate (pre-crystal composition), a dried product (pre-crystal composition), and a slurry or A solution is prepared and added to prepare a mixture, and the mixture is heated at, for example, 250 ° C. or more under vacuum or an inert atmosphere, and then, for example, about 500 ° C. to 100 ° C. ( : Preferably, the heat treatment is performed at about 600 to 950 ° C. to produce a catalyst for purifying exhaust gas comprising zero alumina and Z or a alumina supporting a belovskite-type composite oxide. it can.
- a mixed alkoxide solution (pre-crystal composition) containing the alkoxides of the above-described elements (elemental components) except for the noble metal in the above stoichiometric ratio is prepared, and then the noble metal salt is added.
- a precipitate is obtained by adding an aqueous solution containing the solution and subject to hydrolysis to obtain a precipitate (pre-crystal composition). After drying, at least one of the steps of heat-treating the dried substance (pre-crystal composition) is performed before the heat treatment.
- the alkoxide of each element which is obtained by mixing powders of 0-alumina and alumina or a-alumina in the composition, includes, for example, an alcoholate formed from each element and an alkoxy such as methoxy, ethoxy, propoxy, isopropoxy, butoxy, and the like.
- Examples include alkoxy alcohols of each element represented by the following general formula (8).
- E [O CH (R 1 ) (CH 2 ); -OR 2 ] j (8) (wherein E represents each element, and R 1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. R 2 represents an alkyl group having 1 to 4 carbon atoms, i represents an integer of 1 to 3, and j represents an integer of 2 to 4.)
- the alkoxy alcoholate includes, for example, methoxyxylate, methoxypropylate, methoxybutyrate, ethoxyxylate, ethoxypropylate, proboxixylate, butoxyxylate, and the like. I can do it.
- the mixed alkoxide solution can be prepared, for example, by adding an alkoxide of each element to an organic solvent so as to have the above stoichiometric ratio and stirring and mixing.
- the organic solvent is not particularly limited as long as the alkoxide of each element can be dissolved, and examples thereof include aromatic hydrocarbons, aliphatic hydrocarbons, alcohols, ketones, and esters.
- aromatic hydrocarbons such as benzene, toluene and xylene are exemplified.
- an aqueous solution containing a salt of a noble metal is added to the mixed alkoxide solution at a predetermined stoichiometric ratio to cause precipitation, thereby obtaining a precipitate.
- the aqueous solution containing a salt of a noble metal include an aqueous nitrate solution, an aqueous chloride solution, an aqueous hexammine chloride solution, an aqueous dinitrodiammine nitric acid solution, hexacroic acid hydrate, and potassium cyanide salt.
- pre-crystal composition is dried by, for example, vacuum drying or ventilation drying to obtain a dried product (pre-crystal composition).
- the powder of 0-alumina and / or ⁇ -alumina is mixed with at least one of a mixed alkoxide solution (pre-crystal composition), a precipitate (pre-crystal composition), and a dried product (pre-crystal composition).
- pre-crystal composition a mixed alkoxide solution
- pre-crystal composition a precipitate
- pre-crystal composition a dried product
- a homogeneous mixed solution (pre-crystal composition) can be prepared by mixing a solution containing an organic metal salt of a noble metal with the mixed alkoxide solution described above.
- organic metal salt of the noble metal examples include, for example, an S-diketone compound or a] 3-ketoester compound represented by the following general formula (6), and a ⁇ -dicarboxylic acid ester compound represented by the following general formula (7): Precious metal formed And a metal chelate complex of
- R 3 is an alkyl group having 1 to 6 carbon atoms, a fluoroalkyl group or an aryl group having 1 to 6 carbon atoms
- R 4 is an alkyl group having 1 to 6 carbon atoms
- a fluoroalkyl having 1 to 6 carbon atoms A group, an aryl group or an alkyloxy group having 1 to 4 carbon atoms
- R 5 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- R 6 represents an alkyl group having 1 to 6 carbon atoms
- R 7 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- examples of the alkyl group having 1 to 6 carbon atoms of R 3 , R 4 and R 6 include, for example, methyl, ethyl, propyl, isopropyl, n-butyl, Examples include s-butyl, t-butyl, t-amyl, and t-hexyl. Also, as the alkyl group for R 5 and the carbon number of R 7. 1 to 4, for example, methyl, Echiru, propyl, isopropyl, n- heptyl, s _ heptyl, t - like butyl.
- Examples of the fluoroalkyl group having 1 to 6 carbon atoms for R 3 and R 4 include trifluoromethyl and the like.
- Examples of the aryl groups of R 3 and R 4 include, for example, phenyl.
- Examples of the alkyloxy group having 1 to 4 carbon atoms for R 4 include methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, s-butoxy, and t-butoxy.
- diketone compounds include, for example, 2,4-pentenyl, 2,4-hexanedione, 2,2-dimethyl-3,5-hexanedione, 1-phenyl-1,3- Butanedione, 1-trifluoromethyl-1,3-butanedione, hexafluoroacetylacetone, 1,3-diphenyl-1,3-propanedione, dipivaloylmethane and the like.
- ⁇ -ketoester compound include, for example, methyl acetate acetate, ethyl acetate acetate, t-butyl acetate acetate, and the like.
- ⁇ _ di examples of the carboxylic acid ester compound include dimethyl malonate and methyl malonate.
- a solution containing an organic metal salt of a noble metal can be prepared, for example, by adding an organic metal salt of a noble metal to an organic solvent so as to have the above stoichiometric ratio and stirring and mixing.
- organic solvent include the above-mentioned organic solvents.
- the solution containing the organometallic salt of the noble metal thus prepared is mixed with the mixed alkoxide solution described above to prepare a homogeneous mixed solution (pre-crystal composition), and then water is added to precipitate the solution.
- a precipitate pre-crystal composition
- a mixture is prepared by adding a solution, and the resulting mixture is heat-treated at, for example, about 400 to 100 ° C., preferably about 500 to 850 ° C.
- an exhaust gas purifying catalyst comprising S-alumina and Z or ⁇ -alumina carrying a perovskite-type composite oxide can be produced.
- the perovskite-type composite oxide is supported in a sufficiently dispersed state with respect to ⁇ alumina and ⁇ or ⁇ -alumina.
- the catalyst activity can be improved. That is, mixing the homogeneous mixed solution with the powder of 0 alumina and ⁇ ⁇ ⁇ ⁇ or ⁇ -alumina, rather than mixing the mixed alkoxide solution with the powder of 0 alumina and / or ⁇ -alumina,
- the perovskite-type composite oxide can be further supported in a sufficiently dispersed state, and the catalytic activity can be significantly improved.
- the belovskite-type composite oxide is supported on the powder of 0-alumina and Z or ⁇ -alumina.
- the complex oxide is stable, the specific surface area is not reduced much, and the heat resistance of the belovskite complex oxide can be sufficiently secured. Therefore, it is possible to effectively prevent the catalyst performance from lowering.
- an exhaust gas purifying catalyst can be industrially efficiently produced.
- the exhaust gas purifying catalyst thus obtained furthermore, zirconyl two ⁇ -based composite oxide, ceria composite oxide, 0 alumina, alpha alumina, Aarumi Na, S r Z ⁇ 3 Oyobi a
- At least one heat-resistant oxide selected from the group consisting of 1 to 3 can be mixed.
- the heat resistance of the belovskite-type composite oxide can be further improved. Therefore, by mixing such a heat-resistant oxide, for example, the exhaust gas purification obtained by the production method of the present invention in an environment where a very severe high-temperature atmosphere such as a hot water bath is used. The use of a catalyst for use can be easily realized.
- the zirconia-based composite oxide is preferably represented by the following general formula (9).
- R represents a rare earth element excluding Al earth metal and / or C e
- a represents an atomic ratio of C e of 0.1 l ⁇ a ⁇ 0.65
- b ⁇ 0.55 indicates the atomic ratio of R
- 1 (a + b) indicates the atomic ratio of Zr of 0.35 ⁇ 1 — (a + b) ⁇ 0.9
- c indicates Shows the amount of oxygen vacancies.
- alkaline earth metal represented by R examples include, for example, Be, Mg, Ca, S r, Ba, and Ra.
- Mg, Ca, Sr and Ba are mentioned.
- the rare earth element represented by R is a rare earth element other than Ce, and is, for example, Sc, Y, La, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.
- Sc, Y, La, Pr, and Nd are used.
- the atomic ratio of Ce represented by a is in the range of 0.1 to 0.65.
- the atomic ratio of R represented by b is in the range of 0 to 0.55 (that is, R is not an essential component but an optional component that is optionally contained. The atomic ratio is 5 or less). If it exceeds 0.55, phase separation or other complex oxide phases may be formed.
- the atomic ratio of Zr represented by 1— (a + b) is in the range of 0.35 to 0.9.
- the atomic ratio of Zr is preferably in the range of 0.5 to 0.9, and more preferably in the range of 0.6 to 0.9.
- the zirconia-based composite oxide represented by the general formula (9) preferably has an atomic ratio of Ce of 0.5 or less.
- the zirconium-based composite oxide represented by (9) and the ceria-based composite oxide represented by the following general formula (10) are used in combination, the zirconium-based composite oxide represented by the general formula (9) is used. It is preferable that the atomic ratio of Zr of the composite oxide be higher than the atomic ratio of Zr of the ceria-based composite oxide represented by the general formula (10).
- c indicates the amount of oxygen vacancies, which means the proportion of vacancies formed in the olivine-type crystal lattice normally formed by oxides of Zr, Ce and R. I do.
- Such a zirconia-based composite oxide is not particularly limited and can be produced by a known method.
- ceria-based composite oxide is preferably represented by the following general formula (10).
- L represents an alkaline earth metal and / or a rare earth element excluding Ce
- e represents 0 ⁇ e ⁇ 0 2 indicates the atomic ratio of L
- 1 (d + e) indicates the atomic ratio of 0.3 ⁇ 1 — (d + e) ⁇ 0.8
- ': f indicates the oxygen defect Indicate the amount.
- Examples of the alkaline earth metal and / or rare earth element represented by L include the same as the alkaline earth metal and rare earth element represented by R described above.
- Preferred examples of the alkaline earth metal include Mg, Ca, Sr, and Ba.
- Preferred examples of the rare earth element include Sc, Y, La, Pr, and Nd. . These alkaline earth metals and rare earth elements may be used alone or in combination of two or more.
- the atomic ratio of Zr represented by d is in the range of 0.2 to 0.7. If it is less than 0.2, the specific surface area may be too small to exhibit the catalytic performance, and if it exceeds 0.7, the oxygen storage capacity may be low and the catalytic performance may not be exhibited.
- the atomic ratio of L represented by e is in the range of 0 to 0.2 (that is, L is not an essential component but an optional component that is arbitrarily included. The atomic ratio is 2 or less). If it exceeds 0.2, phase separation and other complex oxide phases may be formed.
- the atomic ratio of C e represented by 1 — (d + e) is in the range of 0.3 to 0.8.
- the atomic ratio of Ce is preferably in the range of 0.4 to 0.6.
- the ceria-based composite oxide represented by the general formula (10) preferably has an atomic ratio of Zr of 0.5 or less.
- the atomic ratio of Ce in the ceria-based composite oxide represented by the general formula (10) is It is preferable that the ratio is higher than the atomic ratio of Ce in the zirconia-based composite oxide represented by (9).
- F indicates the amount of oxygen vacancies, which means the percentage of vacancies formed in the olivine-type crystal lattice normally formed by oxides of Ce, Zr, and L. I do.
- Such a seria composite oxide can also be obtained by a known method in the same manner as the method for producing a zirconia composite oxide described above.
- the range of the atomic ratio of each element of the zirconium-based composite oxide represented by the general formula (9) depends on the range of the atomic ratio of each element of the zirconium-based composite oxide or the ceria-based composite oxide actually used. In the case where it overlaps with any of the ranges of the atomic ratios of the respective elements of the ceria-based composite oxide represented by, it may be classified without any particular limitation. For example, when a plurality of zirconia-based composite oxides and / or ceria-based composite oxides are used, they are appropriately determined depending on the formulation to be mixed. For example, when a noble metal is supported, by supporting only Pt without using Rh on the seria composite oxide, the seria composite oxide can be used separately from the zirconia composite oxide.
- alumina may contain La and ⁇ or Ba similarly to the above, that is, those represented by the following general formula (5) are preferably used.
- D represents L a and Z or B a
- g represents an atomic ratio of D satisfying 0 ⁇ g ⁇ 0.5.
- D represents La and Z or Ba
- the atomic ratio of D represented by g is 0 to It is in the range of 0.5. That is, La and Ba are not essential components but optional components included arbitrarily, and if included, have an atomic ratio of 0.5 or less.
- the alumina is not particularly limited, and a known alumina used as an exhaust gas purifying catalyst is used.
- S r Z r 0 3 for example, zirconium salts and scan strontium salt, Or, etc. using alkoxide zirconium alkoxide Ya strontium, may be obtained by known methods.
- L a A 1 0 3 for example, lanthanum salts and aluminum salts or, etc. using alkoxide lanthanum alkoxide Ya aluminum, obtained by the same manufacturing method as for Jirukonia composite oxide noted above be able to.
- the mixing ratio of such a heat-resistant oxide is not particularly limited.
- ⁇ The heat-resistant oxide is mixed with 1 part by weight of alumina and / or ⁇ -alumina supporting the lobskite-type composite oxide. (Total amount) is 0.5 to 30 parts by weight, preferably 0.5 to 10 parts by weight. If the amount of the heat-resistant oxide is less than this, the heat resistance may not be sufficiently improved. In addition, when the amount of the heat-resistant oxide is larger than this, the heat-resistant oxide may be contained more than necessary, which may be disadvantageous in cost and production.
- the mixing of the heat-resistant oxide is not particularly limited, and may be physically mixed with S-alumina and / or ⁇ -alumina on which the perovskite-type composite oxide is supported.
- perovskite-type composite oxide The powder of 0-alumina and ⁇ or ⁇ -alumina, on which the powder is supported, and the powder of the heat-resistant oxide may be dry-mixed or wet-mixed.
- the heat-resistant oxide preferably contains a heat-resistant oxide carrying a noble metal.
- a heat-resistant oxide carrying a noble metal By adding a heat-resistant oxide carrying a noble metal, it is possible to further increase the catalytic activity in addition to the noble metal contained in the perovskite-type composite oxide, thereby further improving the catalytic performance. This Can be.
- noble metal examples include Pd, Rh, and Pt.
- R h and P t are used. These noble metals may be used alone or in combination of two or more.
- No particular limitation is imposed on the method of supporting the noble metal on the heat-resistant oxide, and a known method can be used.
- a solution of a salt containing a noble metal may be prepared, the salt-containing solution may be impregnated with a heat-resistant oxide, and then fired.
- a solution of the salt exemplified above may be used, and practically, a nitrate aqueous solution, a dinitrodiammine nitric acid solution, a chloride aqueous solution and the like can be mentioned.
- a palladium salt solution for example, palladium nitrate aqueous solution, dinitrodiammine palladium nitrate solution, tetravalent palladium amine nitrate solution, etc.
- a rhodium salt solution for example, rhodium nitrate solution, rhodium chloride solution, etc.
- the platinum salt solution include dinitrodiammineplatinum nitric acid solution, chloroplatinic acid solution, and tetravalent platinum ammine solution.
- the refractory oxide After the refractory oxide is impregnated with the noble metal, for example, it is dried at 50 to 200 ° C. for 1 to 48 hours, and then at 350 to 100 ° C.! Bake for ⁇ 12 hours.
- the heat-resistant oxide is a zirconia-based composite oxide / a seria-based composite oxide, zirconium, cerium, an alkaline earth metal
- a noble metal salt solution is added, and the noble metal is co-precipitated with each component of the zirconia-based composite oxide / ceria-based composite oxide.
- An example is a method in which the material is precipitated and then fired.
- the heat-resistant oxide is 0-alumina or ⁇ -alumina-dia-alumina
- the aluminum oxide, ⁇ -alumina or ⁇ -alumina is precipitated from an aqueous aluminum salt solution using ammonia or the like in the production process of the noble metal
- Add salt solution and co-precipitate noble metal with 0 alumina, Q! Alumina is exemplified.
- two or more types of noble metals When two or more types of noble metals are supported, two or more types of noble metals may be supported at one time, or may be separately supported in a plurality of times.
- the amount is appropriately determined depending on the purpose and use. For example, 0.01 to 3.0% by weight, and preferably 0.05 to 1.0% by weight, based on the total amount of the heat-resistant oxide. %.
- Examples of the heat-resistant oxide carrying a noble metal obtained in this manner include a zirconia-based composite oxide carrying a noble metal, a ceria-based composite oxide carrying a noble metal, and a noble metal. And alumina supported with a noble metal.
- the zirconia-based composite oxide carrying a noble metal preferably, a zirconia-based composite oxide carrying Pt and / or Rh is used.
- the supported amount of Pt and Rh or Rh is 0.01 to 2.0% by weight, preferably 0.05 to 1.0% by weight, based on the zirconia-based composite oxide. is there.
- the ceria-based composite oxide carrying a noble metal preferably, a ceria-based composite oxide carrying Pt is exemplified.
- the supported amount of Pt is 0.01 to 2.0% by weight, preferably 0.05 to 1.0% by weight, based on the ceria-based composite oxide.
- the S-alumina carrying a noble metal preferably, alumina containing Pt and Z or Rh is used.
- the supported amount of Pt and Z or Rh is from 0.01 to 2.0% by weight, preferably from 0.05 to 0.5% by weight, based on 0 alumina.
- the ⁇ -alumina on which the noble metal is supported preferably, alumina which supports Pt and Z or Rh is mentioned.
- the loading amount of Pt and Z or Rh was 0.01 with respect to alumina.
- a ceria-based composite oxide supporting a noble metal is preferable. The use of a seria composite oxide carrying a noble metal can improve oxygen storage performance.
- noble metal may be supported on all the heat-resistant oxides as a whole, and the heat-resistant oxide supporting the noble metal and the noble metal are not supported. It may contain both of a heat-resistant oxide.
- the exhaust gas purifying catalyst obtained by the production method of the present invention can be formed, for example, as a coat layer on a catalyst carrier.
- the catalyst carrier is not particularly limited, and a known catalyst carrier such as a honeycomb-shaped monolith carrier made of cordierite or the like is used.
- the above-mentioned belovskite-type composite oxide is supported. ⁇ Alumina and Z or ⁇ -alumina; The oxide was slurried by adding water, coated on the catalyst support, dried at 50 to 200 ° C for 1 to 48 hours, and then dried at 350 to 100 ° C. And bake for 1 to 12 hours. Further, after adding water to each of the above-mentioned components to form slurries, these slurries are mixed, coated on a catalyst carrier, and dried at 50 to 200 ° C. for 1 to 48 hours, Further, at 350 to 100 ° C .; It may be fired for up to 12 hours.
- the exhaust gas purifying catalyst obtained by the production method of the present invention may be formed on a catalyst carrier as a multilayer having an outer layer formed on the surface and an inner layer formed inside the outer layer. it can.
- the inner layer may be formed by coating the slurry containing each component on the catalyst carrier, drying and sintering the slurry, as described above.
- the outer layer is formed by coating a slurry containing each component on the inner layer formed on the catalyst carrier in the same manner as described above, and drying the slurry. After drying, it may be fired.
- the inner layer carries a belovskite-type composite oxide. Is preferably contained.
- 0 alumina and / or ⁇ -alumina on which a belovskite-type composite oxide is supported can be used alone. They may be used, or two or more kinds may be used in combination. That is, for example, ⁇ -alumina and / or ⁇ -alumina carrying a belovskite-type composite oxide may be contained only in the inner layer, or may be contained only in the outer layer, or may be the same or different.
- Alumina and / or alumina may be contained in the same layer in plurals, and the same or different types of perovskite-type composite oxides are supported.
- the 0-alumina and the ⁇ or ⁇ -alumina may be contained in both the inner layer and the outer layer.
- the exhaust gas purifying catalyst obtained by the production method of the present invention is formed as a multilayer as described above, a Pd-containing perovskite-type composite oxide is supported.6> Alumina and / or Preferably, ⁇ -alumina is contained in the inner layer.
- the inner layer contains 0-alumina and / or ⁇ -alumina on which a Pd-containing viscous composite oxide is supported, the poisoning of Pd contained in the perovskite-type composite oxide and Thermal deterioration can be prevented, and durability can be improved.
- the exhaust gas purifying catalyst obtained by the production method of the present invention When formed as a multilayer, the outer layer preferably contains 0 alumina and Z or ⁇ -alumina supporting the Rh-containing perovskite-type composite oxide. Rh-containing perovskite-type composite oxide is carried on the outer layer.By containing 0-alumina and Z or ⁇ -alumina, the Pd-containing perovskite-type composite oxide is contained in the inner layer. In some cases, alloying with Pd can be prevented.
- the alumina containing Pt-containing perovskite-type composite oxide supports 0 alumina and Z or ⁇ or ⁇ .
- Alumina is preferably included in the inner layer and / or the outer layer.
- the noble metal contained in the outer layer (the noble metal contained in the perovskite-type composite oxide, and , And the noble metal supported on the refractory oxide) are Rh and ⁇ or Pt
- the noble metal contained in the inner layer (the noble metal contained in the belovskite-type composite oxide, and Including a noble metal supported on a heat-resistant oxide.) Is preferably at least Pd.
- Pd is contained in the inner layer to prevent poisoning and thermal deterioration, and the catalyst performance is further improved by Rh, Z or Pt contained in the outer layer. Can be.
- the inner layer contains a seria-based composite oxide carrying a noble metal and / or zero alumina.
- Zirconium-based composite oxide carrying a noble metal, seria-based composite oxide carrying a noble metal, »Alumina and a precious metal being carried It is preferable that at least two kinds of heat-resistant oxides of the alumina are contained in the outer layer.
- the exhaust gas purifying catalyst obtained by the production method of the present invention further contains one or more of sulfates, carbonates, nitrates or acetates of Ba, Ca, Sr, Mg, and La. May be.
- a sulfate, carbonate, nitrate or acetate is formed as a multilayer, it is preferable to include it in a layer containing Pd.
- a Sulfate, carbonate, nitrate and acetate it is possible to suppress poisoning of Pd hydrocarbons (HC) and the like, and to prevent a decrease in catalytic activity.
- B a S_ ⁇ 4 is preferably used.
- the proportion of one or more of sulfate, carbonate, nitrate and acetate is appropriately selected depending on the purpose and use.
- the formation of the inner layer and the Z or outer layer containing at least one of sulfates, carbonates, nitrates or acetates is performed, for example, by adding sulfuric acid to the slurry for forming the inner layer and the Z or the outer layer. Salts, carbonates, nitrates and / or acetates may be mixed.
- the inner layer can be further formed as a multilayer according to its purpose and application.
- To form the inner layer as a multilayer the same method as described above is used.
- the noble metal is stable in the perovskite-type composite oxide because the perovskite-type composite oxide is supported on alumina and / or ⁇ -alumina.
- the heat resistance of the perovskite-type composite oxide can be significantly increased by ⁇ alumina and ⁇ or ⁇ -alumina.
- the solid solution of the noble metal with respect to the berobes force-type structure in an oxidizing atmosphere and the precipitation in a reducing atmosphere are repeated. Due to the self-regenerating function, the noble metal is kept fine and highly dispersed in the perovskite-type composite oxide even during long-term use in a high-temperature atmosphere, and high catalytic activity can be maintained. In addition, due to the self-regeneration function of solid solution precipitation of a noble metal in a redox atmosphere with respect to a bevelskite-type structure, catalytic activity can be realized even if the amount of noble metal used is significantly reduced.
- the heat resistance of the perovskite-type composite oxide is enhanced by 0-alumina and / or ⁇ -alumina, for example, 900 ° (: up to 100 ° (:, It is possible to suppress the grain growth of the belovskite-type composite oxide in a high-temperature atmosphere exceeding 50 ° C., thereby preventing the specific surface area from decreasing.
- the exhaust gas purifying catalyst obtained by the production method of the present invention can maintain the catalytic activity of a noble metal at a high level over a long period of time even under a high-temperature atmosphere exceeding 900 ° C to 100 ° C. And excellent exhaust gas purification performance can be realized. Therefore, it can be suitably used as an exhaust gas purifying catalyst for automobiles.
- This zirconia-based composite oxide powder is impregnated with a dinitrodiammineplatinum nitrate solution, dried at 100 ° C, then impregnated with a rhodium nitrate solution, dried at 100 ° C, and dried at 500 ° C.
- a powder of a Pt—Rh-supported zirconia-based composite oxide (Production Example A1-1) having a C-supporting amount of 0.27% by weight and an Rh-supporting amount of 1.33% by weight was obtained.
- the above components were dissolved in 100 mL of deionized water to prepare a mixed salt aqueous solution.
- the mixed salt aqueous solution was gradually added dropwise to an alkaline aqueous solution prepared by dissolving 25.0 g of sodium carbonate in 200 mL of deionized water to obtain a coprecipitate.
- the coprecipitate was sufficiently washed with water and filtered, and then dried at 80 ° C. under vacuum to be sufficiently dried.
- This zirconia-based composite oxide powder is impregnated with a dinitrodiammineplatinum nitrate solution, dried at 100 ° C, then impregnated with a rhodium nitrate solution, dried at 100 ° C, and dried at 500 ° C.
- Pt—Rh supported zirconia-based composite oxide with a supported amount of 1.0% by weight and a 111 supported amount of 1.0% by weight (Production Example A2-1) or? 1;
- a powder of a Pt—Rh-supported zirconia-based composite oxide (Production Example A2-2) with a loading of 0.27% by weight and a Rh loading of 1.33% by weight was obtained. .
- the mixed salt aqueous solution was gradually added dropwise to an alkaline aqueous solution prepared by dissolving 25.0 g of sodium carbonate in 200 mL of deionized water to obtain a coprecipitate.
- the coprecipitate was sufficiently washed with water and filtered, and then dried at 80 ° C. under vacuum to be sufficiently dried.
- the above components were dissolved in 100 mL of deionized water to prepare a mixed salt aqueous solution.
- the aqueous mixed salt solution was gradually dropped into an alkaline aqueous solution prepared by dissolving 25.0 g of sodium carbonate in 200 mL of deionized water to obtain a coprecipitate.
- the coprecipitate was sufficiently washed with water and filtered, and then dried under vacuum at 80 to fully dry.
- This zirconia-based composite oxide powder is impregnated with a dinitrodiammineplatinum nitrate solution, dried at 100 ° C, then impregnated with a rhodium nitrate solution, dried at 100 ° C, and dried at 500 ° C.
- a powder of a Pt—Rh-supported zirconium-based composite oxide (Production Example A4-1) having a supported amount of 1.25% by weight was obtained.
- the above components were dissolved in 100 mL of deionized water to prepare a mixed salt aqueous solution.
- the mixed salt aqueous solution was gradually added dropwise to an alkaline aqueous solution prepared by dissolving 25.0 g of sodium carbonate in 200 mL of deionized water to obtain a coprecipitate.
- the coprecipitate was sufficiently washed with water and filtered, and then dried at 80 ° C. under vacuum to be sufficiently dried.
- a powder of a seria-based composite oxide (Preparation Example B 1) composed of 0.30 Y 10 .
- the cell oxide powder was impregnated with a dinitrodiammineplatinum nitric acid solution, dried at 100 ° C., and calcined at 500 ° C., so that the Pt carrying amount was 1.0% by weight.
- % Of Pt-supported ceria-based composite oxide (Production Example B1-1), Pt-supported ceria-based composite oxide of 0.33% by weight (Production Example B1-2), Or 1: Pt-loaded ceria-based composite oxide with a loading of 0.67% by weight (Production Example B1-3), Pt-loaded ceria with a Pt loading of 1.38% by weight
- a powder of a Pt-supported ceria-based composite oxide (Production Example B1-5) having a loading of 1.50% by weight was obtained.
- This cell oxide powder is impregnated with a dinitrodiammineplatinum nitric acid solution, dried at 100 ° C., then impregnated with a rhodium nitrate solution, dried at 100 ° C., and dried at 500 ° C.
- the Pt supported amount becomes 2.0% by weight and the Rh supported amount becomes 1.0% by weight.
- Pt—Rh supported ceria-based composite oxide (Production Example B 2— 1) was obtained.
- Aluminum methoxide 60.6 g (0.240 mol)-Lanthanum methoxide 0.55 g (0.015 mol) The above components were placed in a 500 mL round bottom flask. In addition, 300 mL of toluene was added, and the mixture was stirred and dissolved to prepare an A1La homogeneous mixed alkoxide solution. Then, 200 mL of deionized water was added dropwise to the solution over about 15 minutes. A gray viscous precipitate was formed upon hydrolysis.
- Aluminum methoxide chelate 59.4 g (0.236 mol) Lanthanum methoxide chelate 1.1 g (0.003 mol) Add the above components to a 500 mL round bottom flask and add toluene 30 By adding 0 mL and stirring and dissolving, an A1La homogeneous mixed alkoxide solution was prepared. Then add 200 mL of deionized water to this solution over about 15 minutes. It was dropped. A gray viscous precipitate was formed upon hydrolysis.
- the above components were placed in a 500 mL round bottom flask.
- 300 mL of toluene was added, and the mixture was stirred and dissolved to prepare an A1Ba homogeneous mixed alkoxide solution.
- 200 mL of deionized water was added dropwise to the solution over about 15 minutes. A gray viscous precipitate was formed upon hydrolysis.
- toluene and water were distilled off under reduced pressure to obtain a mixture of A1Ba composite oxide.
- a powder of alumina (specific surface area: 200 m 2 Zg; the same applies hereinafter) is impregnated with a dinitrodiammineplatinum nitric acid solution, dried at 100 ° C., By impregnating with a solution of palladium, drying at 100 ° C, and calcining at 500 ° C, 1; the loading amount is 1.0% by weight, and the loading amount of 111 is 0.57% by weight.
- a powder of alumina supported on 1: 1-1 h (Production Example D 1) was obtained.
- the powder was prepared so that the ratio of the belovskite-type composite oxide to 0-alumina was 1: 3 by weight.
- lanthanum-containing 6 »alumina (L a 2 0 3 content of 4.0 wt%) (manufactured 98.0 g of the powder of Preparation C2) was added to this homogeneous mixed solution, and the mixture was stirred and mixed, and then 20 OmL of deionized water was added dropwise over about 15 minutes. A brown viscous precipitate was formed by the hydrolysis.
- the powder was prepared so that the ratio of the belovskite-type composite oxide to the lanthanum-containing alumina was 1: 4 by weight.
- the mixed alkoxide solution was prepared by adding the above components to a 1000 mL round bottom flask, adding 200 mL of toluene, and stirring and dissolving. Then, 2.0 g (0.005 mol) of dimethyl acetyl acetate was dissolved in 20 mL of toluene, and this solution was further added to the mixed alkoxide solution in a round-bottom flask, and A homogeneous mixed solution containing LaFeMnRh was prepared.
- the mixture was transferred to a petri dish, dried by ventilation at 60 ° C. for 24 hours, and then heat-treated at 800 ° C. for 1 hour using an electric furnace in the air to obtain La. x. . F e. .5 7 Mn. 3 S R h 0 . 5 ⁇ 3 Berobusukai preparative composite oxide comprising got a powder of the exhaust gas-purifying catalyst comprising a supported lanthanum containing S alumina.
- This powder was prepared so that the ratio of the perovskite-type composite oxide to the lanthanum-containing alumina was 1: 9 by weight.
- the above components were placed in a 100 mL round bottom flask.
- 200 mL of toluene was added, and the mixture was stirred and dissolved to prepare a mixed alkoxide solution.
- 2.0 g (0.005 mol) of rhodium acetyl acetonate was dissolved in 20 mL of toluene, and this solution was further added to the mixed alkoxide solution in a round-bottomed flask, and La A homogeneous mixed solution containing FeRh was prepared.
- the powder was prepared such that the weight ratio of the perovskite-type composite oxide and the lanthanum-containing 0-alumina was 2: 3.
- Example QA-6 Lanthanum methoxy propylate 38.6 g (0.095 mol) Iron methoxy propylate 18.4 g (0.057 mol) Manganese methoxy propylate 8.9 g (0.03 8 Mol) The above-mentioned components were added to a 100 mL round bottom flask, and 200 mL of toluene was added thereto and dissolved by stirring to prepare a mixed alkoxide solution.
- the powder was prepared such that the weight ratio of the perovskite-type composite oxide and the lanthanum-containing 0-alumina was 1: 1.
- This powder was prepared so that the ratio of the belovskite-type composite oxide to 0-alumina was 1: 4 by weight.
- the aqueous solution of citrate mixed salt is evaporated to dryness in a hot water bath of 60 to 8 Ot: while vacuum is evacuated on a rotary evaporator. At this point, the temperature of the water bath was slowly increased, and finally vacuum-dried at 300 ° C for 1 hour to obtain a citrate complex.
- this citrate complex was disintegrated in a mortar, calcined in the air at 350 ° C. for 3 hours, and added again to the flask having a capacity of 100 O mL.
- the lanthanum-containing 0 alumina in which the pre-crystal composition is dispersed is transferred to a petri dish, and dried by ventilation at 60 ° C for 24 hours, and then dried in air at 800 ° C using an electric furnace. by the time the heat treatment child, to obtain a L a. 0 0 F e 0. 9 0 P d 0. 1 0 O 3 Bae Robusukai preparative composite oxide powder of the supported lanthanum containing ⁇ alumina consisting.
- the powder was prepared such that the weight ratio of the perovskite-type composite oxide and the lanthanum-containing 0-alumina was 1: 1.
- the powder was prepared such that the weight ratio of the perovskite-type composite oxide and the lanthanum-containing 0-alumina was 1: 1.
- the powder was prepared such that the weight ratio of the perovskite-type composite oxide and the lanthanum-containing 0-alumina was 1: 1.
- the lanthanum-containing 0-alumina powder on which the above-obtained perovskite-type composite oxide is supported has? Moses 1.0 0 wt% and R h is 1.0 0 wt% supported Z r 0 7 6 C e 0 . 1 8 L a 0. 0 2 N d 0. 0 4 0 xide force, Ranaru Pt—Rh supported zirconium-based composite oxide (Production example A2-1) powder,? 1;.. 1 0 0 wt% supported C e 0 6. Z r o. 3. Y.
- Pt-supported seria complex oxide composed of ⁇ xide (Production example B 1-1 ) and 0.57% by weight of Pt and 0.14% by weight of Rh Slurry was prepared by adding a powder of 0 alumina (Production Example C6-1) composed of 0 alumina and mixing with deionized water and further adding an alumina sol.
- This slurry 3 mils / 600 cells, 1 liter of cordierite honeycomb carrier of 86 mm ⁇ 104 mm, lanthanum-containing 0 alumina with bevelskite-type composite oxide supported on 3 liters of alumina g, Pt—Rh supported zirconium-based composite oxide: 30 g, Pt-supported ceria-based composite oxide: 80 g,?
- the catalyst for exhaust gas purification was obtained by injecting 70 g of zero-supported alumina, coating uniformly, drying at 100 ° C, and firing at 500 ° C. Was.
- the obtained exhaust gas purifying catalyst had a Pt content of 1.50 g, a Pd content of 0.33 g, and a Rh content of 1 liter of the honeycomb carrier, respectively. 0.40 g.
- the powder was prepared so that the belovskite-type composite oxide and the lanthanum-containing 6> alumina were in a weight ratio of 1: 1.
- the obtained exhaust gas-purifying catalyst had a Pt content of 1.50 g, a Pd content of 0.33 g and a Rh content of 0. 40 g.
- This powder was prepared so that the perovskite-type composite oxide and ⁇ -alumina were in a weight ratio of 1: 2.
- This slurry was added to a 3 mil / 600 cell, (i) 1 liter of a colloidal honeycomb carrier of 86 mm ⁇ 104 mm, and a perovskite-type composite oxide supported on ⁇ -alumina. Is 45 g, Pt—Rh supported zirconia 40 g of the composite oxide, 80 g of the Pt-supported ceria-based composite oxide, and 70 g of the alumina were injected, uniformly coated, dried at 100 ° C., and dried. By firing at 0 ° C, an exhaust gas purifying catalyst was obtained. The obtained exhaust gas-purifying catalyst had a Pt content of 1.50 g, a Pd content of 0.33 g, and a Rh content of 0 liter per liter of the honeycomb carrier. It was 40 g.
- Lanthanum methoxy propylate 40.6 g (0.100 mol) Iron methoxy propylate 30.7 g (0.095 mol) Add the above components to a 100 mL round bottom flask Was added, and toluene (200 mL) was added thereto, followed by stirring and dissolution to prepare a mixed alkoxide solution. Then, 1.52 g (0.05 mol) of palladium acetyl acetate was dissolved in 100 mL of toluene, and this solution was further added to the mixed alkoxide solution in the round-bottom flask, and La A homogeneous mixed solution containing FePd was prepared.
- This powder was prepared so that the ratio of the perovskite-type composite oxide to the lanthanum-containing alumina was 1: 1 by weight.
- the content of each metal per liter of the honeycomb carrier was? 1: 0.10 g, Pc ⁇ SO. 30 g, 1; 0.5 g, 11: 0.4 g in the outer layer.
- the above components were placed in a 100 mL round bottom flask.
- 200 mL of toluene was added, and the mixture was stirred and dissolved to prepare a mixed alkoxide solution.
- 1.52 g (0.005 mol) of palladium acetyl acetonate was dissolved in 100 mL of toluene, and this solution was further added to the mixed alkoxide solution in the round-bottom flask.
- a homogeneous mixed solution containing FePd was prepared.
- the powder was prepared such that the weight ratio of the perovskite-type composite oxide to the lanthanum-containing S-alumina was 1 ′: 1.
- Ce was loaded with 0.67% by weight of 1; in the lanthanum-containing 0 alumina powder on which the palladium-containing perovskite-type composite oxide obtained above was supported. 6 . Zr. 3 . . YQ 1 0 OX P t carrying Seria composite oxide comprising ide (manufacturing Zorei B 1 - 3) of the powder, and added powder 0 alumina, deionized water combined mixed, further added alumina sol Thus, a slurry was prepared. This slurry was loaded with a palladium-containing perovskite-type composite oxide on one liter of a 3 mil / 600 cell, ⁇ 86 mm ⁇ 104 mm cordierite honeycomb support.
- P t force S 0. 2 7 wt% and R h is 1.3 3% by weight supported Z r Q. 5.
- C e. 4 . L a Q. 5 N d. .
- Powder of a Pt-Rh-supported zirconium-based composite oxide (Production Example A1-1) composed of 5 Oxide, Ce loaded with 0.33% by weight of Pt. 6 .
- Zr. 3 . . Y 0 1 0 consisting ⁇ Xide P t carrying Seria based composite oxides (Production Example B 1 - 2) powder and,?
- Pt-Rh supported 0 alumina (Preparation example C 6 — 2) composed of 0.43% by weight of 11; 0.21% by weight of 11 supported on 0.2% by weight of alumina and deionized
- a slurry was prepared by mixing water and further adding alumina sol. This slurry was mixed with a zirconia-based composite oxide supporting Pt—Rh for 1 liter of a cordierite-based honeycomb carrier having a diameter of 86 mm ⁇ 104 mm and a cell size of 3 mils / 600 cells.
- the content of each metal per liter of the honeycomb carrier was? 1; is 0.20 g, 01 is 0.33 g, In the outer layer,? 1: 0.58 g and 11 were 0.55 g.
- the powder of C4) was added to 200 mL of toluene, and the homogeneous mixed solution in the round-bottom flask was further added, followed by stirring and mixing.
- the powder was prepared such that the weight ratio of the perovskite-type composite oxide and the barium-containing 0-alumina was 1: 4.
- Ce was loaded with 0.67% by weight of 1; on the barium-containing S-alumina powder supporting the palladium-containing perovskite-type composite oxide obtained above.
- Se supported on ceria-based mixed oxide powder (manufactured Zorei B 1-3) was added, by mixing deionized water, a further alumina sol
- the slurry was prepared by adding a palladium-containing perovskite-type composite oxide to a 3 mil Z600 cell, 1 liter of cordierite honeycomb carrier of ⁇ 86 ⁇ 104 mm. Injected so that 46 g of the alumina containing the material supported on it would be 46 g and the cerium-based composite oxide supporting Pt would be 45 g, coated uniformly, dried at 100, and then dried. By sintering at ° C, an inner layer was formed.
- Lanthanum methoxy propylate 40.6 g (0.100 mol) Iron methoxy propylate 30.7 g (0.095 mol) Add the above components to a round bottom with a volume of 100 mL
- the mixed alkoxide solution was prepared by adding 200 mL of toluene to the flask and stirring and dissolving. Then, 2.0 g (0.005 mol) of rhodium acetyl acetate was dissolved in 100 mL of toluene, and this solution was further added to the mixed alkoxide solution in the round bottom flask, A homogeneous mixed solution containing LaFeRh was prepared.
- the 0-alumina powder was added to 200 mL of toluene, and a uniform mixed solution of a round-bottomed flask was added thereto, followed by stirring and mixing. Then, 200 mL of deionized water was added dropwise to the solution over about 15 minutes. The hydrolysis produced a brown viscous precipitate.
- the 0-alumina (mixture) in which the pre-crystal composition is dispersed is transferred to a petri dish, dried by ventilation at 60 ° C. for 24 hours, and then heated in air at 600 T using an electric furnace. By heat treatment for one hour,
- this powder was prepared so that the perovskite-type composite oxide and 0-alumina were in a weight ratio of 1: 3.
- the rhodium-containing perovskite-type composite oxide obtained above was supported.
- the content of each metal per liter of the honeycomb carrier was? 1: 0.3 g, P c ⁇ O. 20 g, in the outer layer,? 1; was 0.40 g, and scale 11 was 0.20 g.
- Lanthanum methoxy propylate 40.6 g (0.100 mol) Iron methoxy propylate 30.7 g (0.095 mol) Add the above components to a 100 mL round bottom flask Was added, and toluene (200 mL) was added thereto, followed by stirring and dissolution to prepare a mixed alkoxide solution. Then, 1.52 g (0.05 mol) of palladium acetyl acetate was dissolved in 100 mL of toluene, and this solution was further added to the mixed alkoxide solution in the round-bottom flask, and La A homogeneous mixed solution containing FePd was prepared.
- a pre-crystal composition of a perovskite-type composite enzyme containing d was obtained.
- the pre-crystal composition of the perovskite-type composite oxide containing LaFePd was put into a 100 mL round bottom flask, and 200 mL of IPA (isopropyl alcohol) was added and stirred. And slurry.
- the ⁇ -alumina (mixture) in which the pre-crystal composition is dispersed is transferred to a dish, and dried by ventilation at 60 ° C. for 24 hours.
- a powder of a-alumina carrying a belovskite-type composite oxide consisting of LaL00FeQ.95Pd0.05O3 was obtained.
- the palladium-containing perovskite-type composite oxide obtained above was supported. Ce loaded with 0.33% by weight of 1: on ⁇ -alumina powder. 6 . Zr. 3 . Y Q. 1 Q O P t carrying Seria composite oxide comprising xide (Production Example B 1 one 2) powder, and added powder 0 alumina, a mixture of deionized water, and the alumina sol et A slurry was prepared by the addition. This slurry was applied to 1 liter of a cordierite honeycomb carrier of 3 mils / 600 cells, ⁇ 86 mm ⁇ 104 mm, on which a palladium-containing perovskite-type composite oxide was loaded. 40 g of alumina. Inject 30 g of Pt-supported seria complex oxide and 80 g of 0 alumina, coat uniformly, dry at 100, and fire at 500 ° C. As a result, an inner layer was formed.
- the alumina powder was dissolved in 200 mL of toluene, and a homogeneous mixed solution of a round bottom flask was further added thereto, followed by stirring and mixing.
- This powder was prepared so that the ratio of the belovskite-type composite oxide to alumina was 2: 3 by weight.
- Tona Ru P t carrying Seria based composite oxide (Production Example B 1 - 2) powder were added, and deionized water were mixed and further by addition of alumina sol to prepare a slurry .
- This slurry is loaded on a platinum-containing solid vesicular composite oxide per liter of a 3 mil Z600 cell, ⁇ 86 mm x 104 mm cordierite honeycomb support.
- the outer layer was formed by drying at 100 ° C. and then firing at 500 ° C. to obtain an exhaust gas purifying catalyst.
- the content of each metal per liter of the honeycomb carrier was? 1: is 0.10 g,? Was 0.35 g, and in the outer layer, 1: was 0.60 g and 11 was 0.50.
- Lanthanum toxechylate 40.6 g (0.100 mol) Ironsmith toxichetrate 30.7 g (0.095 mol) Add the above ingredients to a 100 mL round bottom flask. , Toluene 2 0 0 The mixed alkoxide solution was prepared by adding mL and stirring and dissolving. Then, 1.5.2 g (0.05 mol) of palladium acetyl acetate was dissolved in 100 mL of toluene, and this solution was further added to the mixed alkoxide solution in the round-bottomed flask, and L A homogeneous mixed solution containing a FePd was prepared. Its Shi This, in gutter Z r 0 7 o ⁇ e o .
- This powder was prepared so that the ratio of the bevelskite-type composite oxide to the zirconia-based composite oxide was 1: 4 by weight.
- the powder was prepared such that the ratio of the belovskite-type composite oxide to the zirconia-based composite oxide was 2: 3 by weight.
- This powder was prepared so that the ratio of the bevelskite-type composite oxide to the zirconia-based composite oxide was 1: 4 by weight.
- Lanthanum ethoxylate 40.6 g (0.100 moles) Ironsmith toxielate 30.7 g (0.095 moles) Add the above ingredients to a 100 mL round bottom flask and add A mixed alkoxide solution was prepared by adding 200 mL of toluene and dissolving with stirring. Then, 1.52 g (0.05 mol) of palladium acetyl acetate was dissolved in 100 mL of toluene, and this solution was further added to the mixed alkoxide solution in the round-bottom flask, and La A homogeneous mixed solution containing FePd was prepared. 20 OmL of deionized water was added dropwise to the homogeneous mixed solution over about 15 minutes to hydrolyze.
- alumina powder was added to 200 mL of deionized water and added. After stirring and mixing at room temperature for 2 hours, toluene and water were distilled off under reduced pressure to obtain alumina in which the pre-crystal composition of the perovskite-type composite oxide containing LaFePd was dispersed. (mixture) .
- the alumina (mixture) in which the pre-crystal composition is dispersed is -After heat-drying at 60 ° C for 24 hours, heat-treat it in air at 65 ° C for 1 hour using an electric furnace to obtain La. . F e. 95 Pd. . 5 ⁇ 3 Berobusukai Bok-type composite oxide having the composition of the powder was obtained in the exhaust gas purifying catalyst comprising a Aarumina carried.
- This powder was prepared so that the ratio of the bevelskite-type composite oxide to alumina was 1: 4 by weight.
- Pe-supported 0 alumina consisting of 0-alumina loaded with 1.10% by weight of Pd, and Ce 0.60Z loaded with 1.5% by weight of Pt on powder of 0-alumina (Production Example C7) .. r Q 3 QYQ i QO P t carrying Seria composite oxide of Xide (production example B 1 one 5) powder, and 1; is 1.5 0 wt% and R h is 0.6 7 weight
- a slurry of Pt—Rh supported 0 alumina (Preparation Example C6-3) consisting of 0% supported 0 alumina was added, mixed with deionized water, and further added with alumina sol to prepare a slurry.
- This slurry was mixed with 30 g of Pd-supported S-alumina and Pt-supported ceria-based composite per liter of 3 mil Z600 cell, ⁇ 86 mm x 104 mm cordierite honeycomb carrier.
- the content of each metal in the obtained catalyst for purifying exhaust gas per liter of honeycomb carrier was as follows: Pt content: 1.50 g, Pd content: 0.33 g, Rh content The amount was 0.40 g.
- the mixed alkoxide solution was prepared by adding the above components to a 100 mL round bottom flask, adding 200 mL of toluene, and stirring and dissolving. Then, 1.52 g (0.05 mol) of palladium acetyl acetate was dissolved in 100 mL of toluene, and this solution was further added to the mixed alkoxide solution in a round-bottomed flask, and L A homogeneous mixed solution containing a FePd was prepared.
- the alumina (mixture) in which the pre-crystal composition is dispersed is transferred to a Petri dish, dried by ventilation at 60 ° C for 24 hours, and then dried in air at 65 ° C using an electric furnace. La for heat treatment for 1 hour. . F e. . 9 5 Pd. .
- An alumina powder supporting a perovskite-type composite oxide composed of 5 O 3 was obtained.
- This powder was prepared such that the perovskite-type composite oxide and alumina were in a weight ratio of 1: 1.
- a slurry is prepared by adding alumina powder to the ⁇ alumina powder carrying the palladium-containing perovskite-type composite oxide obtained above, mixing deionized water, and further adding alumina sol. did.
- the slurry was applied to a 3 mil / 600 cell, 1 liter cordierite honeycomb carrier of ⁇ 86 mm ⁇ 104 mm, on which a palladium-containing perovskite-type composite oxide was supported.
- the inner layer was formed by injecting 60 g of alumina and 30 g of alumina, coating uniformly, drying at 100 ° C., and firing at 500.
- the content of each metal per liter of the honeycomb carrier was 1; 1.0 g, 0.66 g, and 0.50 g.
- the exhaust gas purifying catalyst powders of Examples and Comparative Examples shown in Table 1 obtained above were subjected to a high-temperature durability treatment under the following conditions.
- the ambient temperature was set to 100 ° C., and a total of 30 minutes of 5 minutes of inert atmosphere, 10 minutes of oxidizing atmosphere, 5 minutes of inert atmosphere, and 10 minutes of reducing atmosphere were performed.
- this cycle was repeated 10 cycles, for a total of 5 hours.
- Each atmosphere is created by supplying a gas having the following composition containing high-temperature steam at a flow rate of 300 LZhr, and the temperature in each atmosphere is maintained at 100 ° C by high-temperature steam. did.
- Inert atmosphere gas composition 8% C 0 2, 1 0% H 2 ⁇ , B a 1 ance N 2 oxidizing ambient gas composition: 1% ⁇ 2, 8% C0 2, 1 0% H 2 O, B a 1 ance N 2
- the exhaust gas purifying catalysts of Examples and Comparative Examples shown in Tables 2 and 3 obtained above were mounted on a single bank of a V8 8-cylinder 4 L engine, respectively.
- the temperature of the exhaust gas purifying catalyst was measured using a thermocouple inserted into the center of the honeycomb carrier.
- a phosphorus compound was added to the fuel (gasoline) so that the catalyst was poisoned by the phosphorus element contained in the exhaust gas.
- the addition amount of the phosphorus compound was set such that, during the durability time shown in Tables 4 to 7, 816 mg of the phosphorus element in terms of the phosphorus element adhered to the exhaust gas purifying catalyst.
- the mixture which is maintained in a substantially stoichiometric state, is supplied to the engine,
- the temperature of the exhaust gas discharged by the combustion of the gas was increased at a rate of 30 ° CZ and supplied to the exhaust gas purifying catalysts of Examples and Comparative Examples shown in Tables 2 and 3 after the durability test.
- Exhaust gas was supplied to the exhaust gas purifying catalyst at a space velocity (SV) of 900 / hour, and the HC concentration in the exhaust gas treated with the exhaust gas purifying catalyst was measured. At this time, the temperature at which the HC in the exhaust gas was purified by 50% was defined as the HC 50% purification temperature.
- Tables 2 and 3 The results are shown in Tables 2 and 3. The mixture supplied to the engine was set so that the force s, which is substantially in a stoichiometric state by feedback control, and its AZF value was 14.6 ⁇ 1.0.
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US10/520,520 US7622418B2 (en) | 2002-07-09 | 2003-07-03 | Method for producing exhaust gas purifying catalyst |
AU2003244203A AU2003244203A1 (en) | 2002-07-09 | 2003-07-03 | Method for producing catalyst for clarifying exhaust gas |
EP03762873A EP1535663A4 (en) | 2002-07-09 | 2003-07-03 | METHOD FOR PRODUCING A CATALYST FOR EXHAUST GAS CLEANING |
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- 2003-07-03 AU AU2003281203A patent/AU2003281203A1/en not_active Abandoned
- 2003-07-03 CN CNA038187019A patent/CN1674985A/zh active Pending
- 2003-07-03 EP EP03741164A patent/EP1533031B1/en not_active Expired - Lifetime
- 2003-07-03 DE DE60332119T patent/DE60332119D1/de not_active Expired - Lifetime
- 2003-07-03 WO PCT/JP2003/008439 patent/WO2004004898A1/ja active Application Filing
- 2003-07-03 CN CNA038185628A patent/CN1674984A/zh active Pending
- 2003-07-03 AU AU2003244203A patent/AU2003244203A1/en not_active Abandoned
- 2003-07-03 US US10/520,823 patent/US7205257B2/en not_active Expired - Fee Related
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Cited By (9)
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US7205257B2 (en) | 2002-07-09 | 2007-04-17 | Daihatsu Motor Co., Ltd. | Catalyst for clarifying exhaust gas |
US7381394B2 (en) | 2002-07-09 | 2008-06-03 | Daihatsu Motor Co., Ltd. | Method for producing perovskite-type composite oxide |
US7622418B2 (en) | 2002-07-09 | 2009-11-24 | Daihatsu Motor Company, Ltd. | Method for producing exhaust gas purifying catalyst |
EP1462428A2 (en) | 2003-03-28 | 2004-09-29 | Dowa Mining Co., Ltd. | Method of producing perovskite complex oxide and precursor substance used in the method |
EP1462427A2 (en) | 2003-03-28 | 2004-09-29 | Dowa Mining Co., Ltd. | Perovskite complex oxide and method of producing the same |
EP1462427A3 (en) * | 2003-03-28 | 2006-08-09 | Dowa Mining Co., Ltd. | Perovskite complex oxide and method of producing the same |
EP1462428A3 (en) * | 2003-03-28 | 2006-08-16 | Dowa Mining Co., Ltd. | Method of producing perovskite complex oxide and precursor substance used in the method |
EP1854538A1 (en) * | 2005-03-04 | 2007-11-14 | Daihatsu Motor Co., Ltd. | Catalyst composition |
EP1854538A4 (en) * | 2005-03-04 | 2011-06-08 | Daihatsu Motor Co Ltd | CATALYTIC COMPOSITION |
Also Published As
Publication number | Publication date |
---|---|
EP1533031B1 (en) | 2010-04-14 |
EP1535663A1 (en) | 2005-06-01 |
AU2003244203A1 (en) | 2004-01-23 |
US20050255993A1 (en) | 2005-11-17 |
DE60332119D1 (de) | 2010-05-27 |
US7205257B2 (en) | 2007-04-17 |
CN1674985A (zh) | 2005-09-28 |
AU2003244203A8 (en) | 2004-01-23 |
US7622418B2 (en) | 2009-11-24 |
AU2003281203A1 (en) | 2004-01-23 |
EP1533031A1 (en) | 2005-05-25 |
AU2003281203A8 (en) | 2004-01-23 |
WO2004004898A1 (ja) | 2004-01-15 |
EP1535663A4 (en) | 2009-04-29 |
EP1533031A4 (en) | 2006-11-02 |
CN1674984A (zh) | 2005-09-28 |
US20050266986A1 (en) | 2005-12-01 |
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