WO2023008408A1 - ジルコニウム複合酸化物、及び、ジルコニウム複合酸化物の製造方法 - Google Patents
ジルコニウム複合酸化物、及び、ジルコニウム複合酸化物の製造方法 Download PDFInfo
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- WO2023008408A1 WO2023008408A1 PCT/JP2022/028719 JP2022028719W WO2023008408A1 WO 2023008408 A1 WO2023008408 A1 WO 2023008408A1 JP 2022028719 W JP2022028719 W JP 2022028719W WO 2023008408 A1 WO2023008408 A1 WO 2023008408A1
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- Prior art keywords
- oxide
- zirconium
- mass
- composite oxide
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- 239000002131 composite material Substances 0.000 title claims abstract description 128
- 229910052726 zirconium Inorganic materials 0.000 title claims abstract description 111
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 66
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 27
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000243 solution Substances 0.000 claims description 45
- 239000011148 porous material Substances 0.000 claims description 33
- 239000012266 salt solution Substances 0.000 claims description 33
- QRTRRDMHGTZPBF-UHFFFAOYSA-L oxygen(2-);zirconium(4+);sulfate Chemical compound [O-2].[Zr+4].[O-]S([O-])(=O)=O QRTRRDMHGTZPBF-UHFFFAOYSA-L 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 29
- 229910052727 yttrium Inorganic materials 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 229910002076 stabilized zirconia Inorganic materials 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 21
- 229910052684 Cerium Inorganic materials 0.000 claims description 19
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 19
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 19
- 150000003754 zirconium Chemical class 0.000 claims description 19
- 239000003054 catalyst Substances 0.000 claims description 18
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims description 18
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 claims description 17
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 12
- 230000001180 sulfating effect Effects 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 claims description 8
- 229910003447 praseodymium oxide Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 239000011232 storage material Substances 0.000 claims description 6
- 150000000703 Cerium Chemical class 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 34
- 238000005245 sintering Methods 0.000 description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 24
- 230000001629 suppression Effects 0.000 description 17
- 238000005259 measurement Methods 0.000 description 15
- IVORCBKUUYGUOL-UHFFFAOYSA-N 1-ethynyl-2,4-dimethoxybenzene Chemical compound COC1=CC=C(C#C)C(OC)=C1 IVORCBKUUYGUOL-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 12
- 239000002243 precursor Substances 0.000 description 12
- 229910001928 zirconium oxide Inorganic materials 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000011259 mixed solution Substances 0.000 description 10
- 150000003746 yttrium Chemical class 0.000 description 9
- 239000002002 slurry Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 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 4
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229910052746 lanthanum Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910000510 noble metal Inorganic materials 0.000 description 4
- ZXAUZSQITFJWPS-UHFFFAOYSA-J zirconium(4+);disulfate Chemical compound [Zr+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZXAUZSQITFJWPS-UHFFFAOYSA-J 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- VZJJZMXEQNFTLL-UHFFFAOYSA-N chloro hypochlorite;zirconium;octahydrate Chemical compound O.O.O.O.O.O.O.O.[Zr].ClOCl VZJJZMXEQNFTLL-UHFFFAOYSA-N 0.000 description 3
- 229910000449 hafnium oxide Inorganic materials 0.000 description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 3
- 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
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- -1 zirconium ions Chemical class 0.000 description 3
- OBOSXEWFRARQPU-UHFFFAOYSA-N 2-n,2-n-dimethylpyridine-2,5-diamine Chemical compound CN(C)C1=CC=C(N)C=N1 OBOSXEWFRARQPU-UHFFFAOYSA-N 0.000 description 2
- 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
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910002637 Pr6O11 Inorganic materials 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- 229910052772 Samarium Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 2
- 239000001099 ammonium carbonate Substances 0.000 description 2
- 239000000908 ammonium hydroxide Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- CMOAHYOGLLEOGO-UHFFFAOYSA-N oxozirconium;dihydrochloride Chemical compound Cl.Cl.[Zr]=O CMOAHYOGLLEOGO-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- YWECOPREQNXXBZ-UHFFFAOYSA-N praseodymium(3+);trinitrate Chemical compound [Pr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O YWECOPREQNXXBZ-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- OERNJTNJEZOPIA-UHFFFAOYSA-N zirconium nitrate Chemical compound [Zr+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O OERNJTNJEZOPIA-UHFFFAOYSA-N 0.000 description 2
- 238000004438 BET method Methods 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 241000588731 Hafnia Species 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 1
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(IV) oxide Inorganic materials O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 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 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- NFSAPTWLWWYADB-UHFFFAOYSA-N n,n-dimethyl-1-phenylethane-1,2-diamine Chemical compound CN(C)C(CN)C1=CC=CC=C1 NFSAPTWLWWYADB-UHFFFAOYSA-N 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- UJVRJBAUJYZFIX-UHFFFAOYSA-N nitric acid;oxozirconium Chemical compound [Zr]=O.O[N+]([O-])=O.O[N+]([O-])=O UJVRJBAUJYZFIX-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 230000019635 sulfation Effects 0.000 description 1
- 238000005670 sulfation reaction Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G25/00—Compounds of zirconium
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the present invention relates to a zirconium composite oxide and a method for producing a zirconium composite oxide.
- Patent Document 1 discloses that a composition containing zirconium oxide and cerium oxide has an apparent surface area of about 1.0 to about 6.0 m 2 /g after heating at 1200° C. for 10 hours or longer. (see especially claim 1).
- Patent Document 2 describes a composition comprising a mixture of four oxides of zirconium, cerium, lanthanum, and any one of yttrium, samarium, or gadolinium among rare earth elements, and heated at 1200 ° C. for 10 hours. It is disclosed that the subsequent specific surface area is 7 m 2 /g or more and 12 m 2 /g or less (especially see claim 1 and examples).
- Patent Document 3 discloses a composition based on zirconium oxide, cerium oxide and yttrium oxide, having a specific surface area of at least 15 m 2 /g after calcination at 1150° C. for 10 hours (especially claim Item 1) and that the specific surface area after heating at 1200° C. for 10 hours is 12 m 2 /g or less (especially see Examples).
- Patent Document 4 discloses that a composition containing zirconium, cerium, and lanthanum has a specific surface area of 35 to 50 m 2 /g after heating at 1100° C. for 4 hours in air. (see especially claim 1).
- a rich spike causes fuel consumption deterioration because it supplies excessive fuel. Therefore, engine control with less rich spikes is expected to become the mainstream in future vehicle development that emphasizes the reduction of CO2 emissions.
- the catalyst and its carrier are exposed to higher temperatures. That is, the heat load on the catalyst and its carrier increases. Higher heat loads sinter the catalyst support. Sintering of the carrier causes a decrease in the specific surface area of the carrier. A decrease in the specific surface area of the carrier causes sintering of the supported noble metal (catalyst). Sintering of the noble metal lowers the catalytic activity and reduces the exhaust gas purifying performance of the catalyst.
- the catalyst used in control where rich spikes are introduced was sufficient if it could withstand a heat load of 1100 ° C., but in the control where rich spikes are reduced, even after exposure to high temperatures exceeding 1200 ° C. It is considered that it is required to have a high specific surface area.
- the present invention has been made in view of the above-mentioned problems, and its object is to provide a zirconium composite oxide capable of maintaining a high specific surface area even when exposed to a higher temperature exceeding 1200 ° C. That's what it is. Another object of the present invention is to provide a method for producing the zirconium composite oxide.
- the inventors have conducted extensive research on zirconium composite oxides. As a result, the inventors have found that the above problems can be solved by adopting the following configuration, and have completed the present invention.
- the zirconium composite oxide according to the present invention is 5% by mass or more and 50% by mass or less of yttrium oxide; cerium oxide and It is characterized by having a specific surface area of 3.0 m 2 /g or more and 20.0 m 2 /g or less after heating at 1250° C. for 10 hours.
- the yttrium oxide content is as high as 5% by mass or more, sintering can be suppressed even when exposed to high temperatures.
- it contains cerium oxide sintering can be suppressed even when exposed to high temperatures.
- the specific surface area after heating at 1250°C for 10 hours is 3.0 m 2 /g or more, it can be said that it has a high specific surface area even if it is exposed to a higher temperature than 1200°C.
- the specific surface area after heating at 1250 ° C since the yttrium oxide content is as high as 5% by mass or more, sintering can be suppressed even when exposed to high temperatures.
- the specific surface area after heating at 1250°C for 10 hours is 3.0 m 2 /g or more, it can be said that it has a high specific surface area even if it is exposed to a higher temperature than 1200°C.
- yttrium oxide at a high content of 5% by mass or more and containing cerium oxide having an effect of suppressing sintering is Since it is 3.0 m 2 /g or more, it is possible to maintain a high specific surface area even when exposed to higher temperatures exceeding 1200°C.
- compositions of Patent Documents 1 to 4 described above disclose that the specific surface area after exposure to 1100° C. is above a certain level, and that the specific surface area after exposure to 1200° C. is above a certain level. It is however, the compositions of Patent Documents 1 to 4 cannot achieve a specific surface area of 3.0 m 2 /g or more after heating at 1250° C. for 10 hours.
- the content of the yttrium oxide is preferably 40% by mass or less.
- the content of yttrium oxide is 40% by mass or less, the amount of cerium oxide and zirconium oxide necessary for the oxygen storage/release material can be suitably contained.
- the content of the cerium oxide is preferably 5% by mass or more and 50% by mass or less.
- the cerium oxide content is 5% by mass or more and 50% by mass or less, a higher sintering suppression effect can be obtained.
- the oxide is preferably one or more oxides selected from the group consisting of lanthanum oxide, neodymium oxide, and praseodymium oxide.
- the oxide is one or more oxides selected from the group consisting of lanthanum oxide, neodymium oxide, and praseodymium oxide, a higher sintering suppression effect can be obtained.
- the content of lanthanum oxide is preferably 1% by mass or more and 30% by mass or less.
- the lanthanum oxide content is 1% by mass or more and 30% by mass or less, a higher sintering suppression effect can be obtained.
- the content of neodymium oxide is preferably 1% by mass or more and 30% by mass or less.
- neodymium oxide When the content of neodymium oxide is 1% by mass or more and 30% by mass or less, a higher sintering suppression effect can be obtained.
- the content of the praseodymium oxide is preferably 1% by mass or more and 30% by mass or less.
- the above structure preferably contains stabilized zirconia containing 20 mol % or more and 30 mol % or less of yttrium oxide.
- Stabilized zirconia has the highest melting point when the yttrium oxide content is 23 mol%. Therefore, if yttrium oxide is contained in an amount of 20 to 30 mol % or more and stabilized zirconia having a high melting point is contained, an even higher effect of suppressing sintering can be obtained.
- the specific surface area after heating at 1200° C. for 10 hours is preferably 12.0 m 2 /g or more and 40.0 m 2 /g or less.
- the pore volume is preferably 0.4 ml/g or more and 1.0 ml/g or less.
- the pore volume When the pore volume is 0.4 ml/g or more and 1.0 ml/g or less, it has a relatively high pore volume before being exposed to high temperatures. Since it has a relatively high pore volume before being exposed to high temperature, the pore volume after being exposed to high temperature can be increased. Since the pore volume after exposure to high temperature can be increased, the specific surface area after exposure to high temperature can be increased.
- it is preferably an oxygen storage material for an exhaust gas purifying catalyst.
- the zirconium composite oxide is an oxygen storage material for an exhaust gas purification catalyst, it has a high sintering suppression effect, so it is possible to suppress deterioration in exhaust gas purification performance.
- the method for producing a zirconium composite oxide according to the present invention includes: A first step of obtaining a composite hydroxide containing Zr and 20 mol% or more and 30 mol% or less of Y in terms of oxide; a second step of obtaining a basic zirconium sulfate-containing reaction solution by mixing a mixture of a sulfating agent and a zirconium salt solution with the composite hydroxide; The method is characterized by comprising a third step of adding a cerium salt solution or a compound to the basic zirconium sulfate-containing reaction solution.
- a basic zirconium sulfate-containing reaction liquid is obtained by mixing a mixed liquid of a sulfating agent and a zirconium salt solution with the composite hydroxide. Therefore, in the obtained basic zirconium sulfate-containing reaction solution, pores are formed by the formation of zirconium sulfate, and the composite hydroxide is highly dispersed in the zirconium sulfate.
- the composite hydroxide becomes stabilized zirconia (hereinafter also referred to as “YSZ”) by firing. Since the composite hydroxide contains a large amount of yttrium, stabilized zirconia having a high melting point is highly dispersed in the finally obtained zirconium composite oxide.
- the finally obtained zirconium composite oxide has a high sintering suppression effect.
- the finally obtained zirconium composite oxide contains cerium oxide, which has a sintering suppression effect.
- the finally obtained zirconium composite oxide has a higher sintering suppression effect.
- the third step is a step of adding a salt solution or a compound of one or more metals selected from rare earth elements other than cerium and yttrium to the basic zirconium sulfate-containing reaction solution. It is preferred to have
- the third step further includes adding a salt solution or compound of one or more metals selected from rare earth elements other than cerium and yttrium to the basic zirconium sulfate-containing reaction solution,
- the finally obtained zirconium composite oxide further contains an oxide of a rare earth element other than cerium and yttrium, which has an effect of suppressing sintering.
- the finally obtained zirconium composite oxide has a higher sintering suppression effect.
- a zirconium composite oxide capable of maintaining a high specific surface area even when exposed to a higher temperature exceeding 1200°C. Also, a method for producing the zirconium composite oxide can be provided.
- zirconia is a general one, and includes 10% by mass or less of impurity metal compounds including hafnia.
- the zirconium composite oxide according to the present embodiment is a composite oxide containing zirconia as an essential component and an oxide other than zirconia (another metal oxide).
- the use of the zirconium composite oxide according to this embodiment is not particularly limited, but it is useful as an oxygen storage material for exhaust gas purification catalysts.
- examples of catalysts that can be supported on the oxygen storage material include noble metal catalysts.
- the zirconium composite oxide has a specific surface area of 3.0 m 2 /g or more and 20.0 m 2 /g or less after heating at 1250° C. for 10 hours. Since the specific surface area after heating at 1250° C. for 10 hours is 3.0 m 2 /g or more, it can be said that it has a high specific surface area even if it is exposed to a higher temperature than 1200° C.
- the specific surface area after heating at 1250° C. for 10 hours is preferably 4 m 2 /g or more, more preferably 5 m 2 /g or more, still more preferably 6 m 2 /g or more, and particularly preferably 8 m 2 /g or more. . It is preferable that the specific surface area after heating at 1250 ° C. for 10 hours is as large as possible.
- the zirconium composite oxide preferably has a specific surface area of 12.0 m 2 /g or more and 40.0 m 2 /g or less after being heated at 1200° C. for 10 hours.
- the specific surface area after heating at 1200°C for 10 hours is 12.0 m 2 /g or more, it is possible to maintain a high specific surface area even when exposed to 1200°C.
- the specific surface area after heating at 1200° C. for 10 hours is preferably 12.2 m 2 /g or more, more preferably 12.5 m 2 /g or more, still more preferably 13 m 2 /g or more, and particularly preferably 14 m 2 /g. g or more. It is preferable that the specific surface area after heating at 1200 ° C. for 10 hours is as large as possible.
- the zirconium composite oxide preferably has a specific surface area of 14 m 2 /g or more and 50 m 2 /g or less after being heated at 1200° C. for 3 hours.
- the specific surface area after heating at 1200° C. for 3 hours is 14 m 2 /g or more, it can be suitably used as a catalyst carrier.
- the specific surface area after heating at 1200° C. for 3 hours is preferably 14.5 m 2 /g or more, more preferably 15 m 2 /g or more, still more preferably 16 m 2 /g or more.
- the specific surface area after heating at 1200 ° C. for 3 hours is preferably as large as possible.
- the zirconium composite oxide preferably has a specific surface area of 20 m 2 /g or more and 60 m 2 /g or less after being heated at 1100° C. for 3 hours.
- the specific surface area after heating at 1100° C. for 3 hours is 20 m 2 /g or more, it can be suitably used as a catalyst carrier.
- the specific surface area after heating at 1100° C. for 3 hours is preferably 22 m 2 /g or more, more preferably 23 m 2 /g or more, still more preferably 24 m 2 /g or more. It is preferable that the specific surface area after heating at 1100 ° C. for 3 hours is as large as possible.
- the zirconium composite oxide preferably has a specific surface area of 30 m 2 /g or more and 80 m 2 /g or less after being heated at 1000° C. for 3 hours.
- the specific surface area after heating at 1000° C. for 3 hours is 30 m 2 /g or more, it can be suitably used as a catalyst carrier.
- the specific surface area after heating at 1000° C. for 3 hours is preferably 33 m 2 /g or more, more preferably 36 m 2 /g or more, still more preferably 38 m 2 /g or more. It is preferable that the specific surface area after heating at 1000 ° C. for 3 hours is as large as possible.
- the zirconium composite oxide preferably has a specific surface area (initial specific surface area) of 40 m 2 /g or more.
- the specific surface area is 40 m 2 /g or more, it can be said that the material has a relatively high specific surface area before being exposed to high temperatures. Since it has a relatively high specific surface area before being exposed to high temperature, the specific surface area after being exposed to high temperature can be further increased.
- the specific surface area (initial specific surface area) refers to the specific surface area after the production of the zirconium composite oxide, without heat treatment, pulverization treatment, or the like.
- the specific surface area is preferably 40 m 2 /g or more, more preferably 45 m 2 /g or more, still more preferably 50 m 2 /g or more, particularly preferably 55 m 2 /g or more, particularly preferably 60 m 2 /g or more. be.
- the specific surface area is preferably as large as possible, but is, for example, 110 m 2 /g or less, 100 m 2 /g or less, 90 m 2 /g or less.
- the specific surface area after heating at 1250° C. for 10 hours, the specific surface area after heating at 1200° C. for 10 hours, the specific surface area after heating at 1200° C. for 3 hours, and the ratio after heating at 1100° C. for 3 hours refer to values obtained by the methods described in Examples.
- the zirconium composite oxide according to this embodiment preferably has a pore volume of 0.02 ml/g or more after heating at 1250° C. for 10 hours. If the pore volume after heating at 1250° C. for 10 hours is 0.02 ml/g or more, it can be said that the shrinkage of the pores is small even when exposed to high temperatures. Therefore, the specific surface area after heating at 1250° C. for 10 hours can be further increased.
- the pore volume after heating at 1250° C. for 10 hours is preferably 0.03 ml/g or more, more preferably 0.04 ml/g or more, still more preferably 0.05 ml/g or more, and particularly preferably 0.06 ml. /g, particularly preferably 0.07 ml/g, very particularly preferably 0.10 ml/g. It is preferable that the pore volume after heating at 1250° C. for 10 hours is as large as possible. is.
- the zirconium composite oxide according to the present embodiment preferably has a pore volume (initial pore volume) of 0.4 ml/g or more.
- a pore volume initial pore volume
- it has a relatively high pore volume before being exposed to high temperatures. Since it has a relatively high pore volume before being exposed to high temperature, the pore volume after being exposed to high temperature can be increased. Since the pore volume after exposure to high temperature can be increased, the specific surface area after exposure to high temperature can be increased.
- the pore volume is preferably 0.4 ml/g or more, more preferably 0.45 ml/g or more, still more preferably 0.5 ml/g or more.
- the pore volume is preferably as large as possible, it is, for example, 1.0 ml/g or less, 0.9 ml/g or less, or 0.8 ml/g or less.
- the particle diameter D50 of the zirconium composite oxide is preferably 0.1 ⁇ m or more and 100 ⁇ m or less.
- the particle diameter D50 is more preferably 0.5 ⁇ m or more and 50 ⁇ m or less.
- the zirconium composite oxide contains zirconia (zirconium oxide).
- the zirconia content is preferably 30% by mass or more, more preferably 35% by mass or more, still more preferably 40% by mass or more, and particularly preferably 43% by mass, when the entire zirconium composite oxide is 100% by mass. More preferably, it is 45% by mass or more.
- the upper limit of the zirconia content is not particularly limited, but the zirconia content is preferably 95% by mass or less, more preferably 92% by mass or less, even more preferably 90% by mass or less, and particularly preferably 85% by mass. %, particularly preferably 80% by mass or less, particularly preferably 75% by mass or less.
- the zirconia content is 30% by mass or more and 95% by mass or less, it can be suitably used as a catalyst carrier.
- the zirconium composite oxide contains stabilized zirconia
- the content of zirconia contained in the zirconium composite oxide is the total amount of zirconia constituting the stabilized zirconia and other zirconia.
- the zirconium composite oxide contains 5% by mass or more and 50% by mass or less of yttrium oxide with respect to the entire zirconium composite oxide. Since the yttrium oxide content is as high as 5% by mass or more, sintering can be suppressed even when exposed to high temperatures. Moreover, since the content of yttrium oxide is 50% by mass or less, the amount of cerium oxide and zirconium oxide necessary for the oxygen storage/release material can be contained. When the zirconium composite oxide contains stabilized zirconia, the content of yttrium oxide contained in the zirconium composite oxide includes yttrium oxide constituting the stabilized zirconia.
- the content of the yttrium oxide is preferably 10% by mass or more, more preferably 15% by mass or more, and even more preferably 20% by mass.
- the content of the yttrium oxide is preferably 48% by mass or less, more preferably 45% by mass or less, particularly preferably 40% by mass or less, particularly preferably 35% by mass or less.
- the zirconium composite oxide contains cerium oxide. Since it contains cerium oxide, sintering can be suppressed even when exposed to high temperatures.
- the content of the cerium oxide is preferably 5% by mass or more, more preferably 7.5% by mass or more, relative to the entire zirconium composite oxide.
- the cerium oxide content is preferably 50% by mass or less, more preferably 45% by mass or less, and particularly preferably 41% by mass or less with respect to the entire zirconium composite oxide. When the cerium oxide content is 5% by mass or more and 50% by mass or less, a higher sintering suppression effect is obtained.
- the zirconium composite oxide preferably contains one or more oxides selected from rare earth elements other than cerium and yttrium. However, the zirconium composite oxide preferably does not contain Pm. That is, the zirconium composite oxide more preferably contains one or more oxides selected from rare earth elements other than Ce, Y, and Pm.
- the rare earth elements are Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.
- the zirconium composite oxide preferably contains one or more oxides selected from the group consisting of lanthanum oxide, neodymium oxide, and praseodymium oxide.
- the zirconium composite oxide contains one or more oxides selected from the group consisting of lanthanum oxide, neodymium oxide, and praseodymium oxide, a higher sintering suppression effect can be obtained.
- the content of one or more oxides selected from rare earth elements other than cerium and yttrium is preferably 1% by mass or more, more preferably 3% by mass or more, and still more preferably 4% by mass or more, particularly preferably 5% by mass or more.
- the content of one or more oxides selected from rare earth elements other than cerium and yttrium is preferably 30% by mass or less, more preferably 20% by mass or less, more preferably 20% by mass or less, with respect to the entire zirconium composite oxide. 15% by mass or less, particularly preferably 10% by mass or less.
- the zirconium composite oxide in addition to zirconia and oxides of rare earth elements other than cerium and yttrium, A) one or more oxides selected from the group consisting of In, Si, P, Sn, Bi and Zn B) transition metal oxides (excluding oxides of rare earth elements and noble metal elements), and C) may contain oxides of one or more elements selected from the group consisting of alkaline earth metal oxides.
- the elements indicated by A) to C) are referred to as "other elements" in this specification.
- the zirconium composite oxide contains the oxide of the other element, the content of the oxide of the other element is 0.1 in terms of oxide when the entire zirconium composite oxide is 100% by mass. % by mass or more.
- the content of the oxides of the other elements is not particularly limited in terms of upper limit, but may be 20% by mass or less, 10% by mass or less, 7% by mass or less, 5% by mass or less, or the like.
- the transition metal include Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, Ta, W and the like.
- the alkaline earth metals include Mg, Ca, Sr and Ba.
- the zirconium composite oxide may contain other impurities within a range (for example, 0.5% by mass or less) that does not contradict the gist of the present invention.
- the impurities are not particularly limited, and include components contained in raw materials, components mixed in the manufacturing process, and components not completely removed in the manufacturing process (for example, SO 4 etc.).
- the zirconium composite oxide preferably contains stabilized zirconia containing 20 mol % or more and 30 mol % or less of yttrium oxide. That is, when the zirconium composite oxide contains stabilized zirconia, the content of yttrium oxide contained in the stabilized zirconia is preferably 20 mol % or more and 30 mol % or less with respect to the entire stabilized zirconia. Stabilized zirconia has the highest melting point at a yttrium oxide content of 23 mol %. Therefore, if yttrium oxide is contained in an amount of 20 to 30 mol % or more and stabilized zirconia having a high melting point is contained, an even higher effect of suppressing sintering can be obtained.
- the content of yttrium oxide contained in the stabilized zirconia is more preferably 22 mol % or more, still more preferably 24 mol % or more, relative to the entire stabilized zirconia.
- the content of yttrium oxide contained in the stabilized zirconia is more preferably 28 mol % or less, still more preferably 26 mol % or less, relative to the entire stabilized zirconia.
- Preferable compositional ratios of the zirconium composite oxide include the following combinations (1) to (4) of which the total does not exceed 100%.
- the zirconium composite oxide according to the present embodiment, it contains yttrium oxide at a high content of 5% by mass or more, contains cerium oxide having a sintering suppression effect, and is heated at 1250 ° C. for 10 hours. Since the surface area is 3.0 m 2 /g or more, it is possible to maintain a high specific surface area even when exposed to higher temperatures exceeding 1200°C.
- the method for producing a zirconium composite oxide includes: A first step of obtaining a composite hydroxide containing Zr and 20 mol% or more and 30 mol% or less of Y in terms of oxide; a second step of obtaining a basic zirconium sulfate-containing reaction solution by mixing a mixture of a sulfating agent and a zirconium salt solution with the composite hydroxide; A third step of adding a cerium salt solution or a compound to the basic zirconium sulfate-containing reaction solution.
- the composite hydroxide can be obtained by mixing a zirconium salt solution and an yttrium salt solution.
- zirconium salt can be used as long as it supplies zirconium ions.
- zirconium oxynitrate, zirconium oxychloride, and zirconium nitrate can be used. These can be used alone or in combination of two or more. Among these, zirconium oxychloride is preferred because of its high productivity on an industrial scale.
- the solvent for making the zirconium salt solution should be selected according to the type of zirconium salt. Water (pure water, ion-exchanged water) is usually preferred.
- the concentration of the zirconium salt solution is not particularly limited, it is generally desirable to contain 5 to 250 g (especially 20 to 150 g) of zirconium oxide (ZrO 2 ) in 1000 g of solvent.
- the yttrium salt solution is not particularly limited, and includes, for example, yttrium chloride solution, yttrium nitrate solution, yttrium acetate solution, and the like.
- the solvent in the yttrium salt solution is not particularly limited, and examples thereof include water, ether, ethanol and the like.
- the concentration of the yttrium salt solution is not particularly limited, it is preferably 10 to 20% by mass in terms of yttrium oxide.
- the total concentration of ZrO 2 and Y 2 O 3 in terms of oxide is 5 w/v% (mass volume percent) or more and 20 w/v% (mass volume percent) ) It is preferable to prepare as follows. By setting the concentration to 5 w/v % or more, it is not necessary to require a long period of time for the filtration treatment described later. Also, by setting the concentration to 20 w/v % or less, it is possible to prevent zirconium and yttrium salts from precipitating out of the solution, especially in winter.
- the content of Y with respect to the total of Zr and Y contained in the resulting composite hydroxide is 20 mol% or more and 30 mol% or less in terms of oxide. It is preferable to mix so that When mixed so that the content of Y is 20 mol% or more and 30 mol% or less in terms of oxide, the content of yttrium oxide in the stabilized zirconia contained in the finally obtained zirconium composite oxide is 20 mol% or more and 30 mol% or less. It becomes possible to
- an alkali such as NaOH aqueous solution or NH 3 OH aqueous solution is added in order to obtain a hydroxide.
- the alkali is not limited, and for example, ammonium hydroxide, ammonium bicarbonate, sodium hydroxide, potassium hydroxide and the like can be used. Among these, sodium hydroxide is preferable from the viewpoint of industrial cost.
- the amount of alkali to be added is not particularly limited as long as hydroxide can be produced as a precipitate from the mixed solution. It is usually added so that the pH of the above solution becomes 11 or higher, preferably 12 or higher.
- a composite hydroxide containing Zr and 20 mol % or more and 30 mol % or less of Y in terms of Y 2 O 3 and a composite hydroxide containing Y (hereinafter also referred to as “YSZ precursor”) is obtained. After that, filter and wash.
- the temperature of the YSZ precursor is raised to 120° C. to 180° C., and the pressure is maintained at 0.2 ⁇ 10 5 Pa to 1.0 ⁇ 10 6 Pa for 30 to 90 minutes to obtain the YSZ precursor slurry. .
- the first step has been explained above.
- ⁇ Second step> a mixed solution of a sulfating agent and a zirconium salt solution and the composite hydroxide (YSZ precursor) are mixed and heated to obtain a basic zirconium sulfate-containing reaction solution (second 2 steps).
- the sulfating agent is not limited as long as it reacts with zirconium ions to generate a sulfate (that is, a reagent for sulfating), and examples thereof include sodium sulfate, potassium sulfate, and ammonium sulfate.
- the sulfating agent may be in any form such as powder or solution, but a solution (particularly an aqueous solution) is preferred. When using a solution, the concentration of the solution can be appropriately set.
- the sulfating agent is preferably added so that the weight ratio of sulfate group (SO 4 2 ⁇ )/ZrO 2 is 0.3 to 0.6.
- the free acid concentration of the mixed solution is preferably 0.2 to 2.2N (regulation).
- free acids include sulfuric acid, nitric acid, hydrochloric acid and the like.
- the type of free acid is not limited, but hydrochloric acid is preferred because of its high productivity on an industrial scale.
- zirconium salt solution the same zirconium salt solution as described in the first step can be used.
- basic zirconium sulfate is produced. That is, the mixed solution contains basic zirconium sulfate.
- the zirconium salt solution and the sulfating agent typically react at temperatures above 65° C. to form basic zirconium sulfate.
- basic zirconium sulfate is produced by adding a mixture of a zirconium salt solution and a sulfating agent to a YSZ precursor slurry at a temperature of 100° C. or higher in an autoclave.
- the mixing ratio of the mixed solution and the composite hydroxide (YSZ precursor) is not particularly limited, but the content of yttrium oxide contained in the finally obtained zirconium composite oxide is 5 mass% or more and 40 mass % or less.
- the mixing time of the mixed solution and the composite hydroxide is preferably 10 minutes to 60 minutes.
- the produced basic zirconium sulfate can be aged.
- Examples of basic zirconium sulfate include, but are not limited to, hydrates of compounds such as ZrOSO4.ZrO2 , 5ZrO2.3SO3 , and 7ZrO2.3SO3 .
- the basic zirconium sulfate may be one or a mixture of two or more thereof.
- the mixing temperature of the mixed solution and the composite hydroxide is preferably 110°C to 150°C.
- the cooling is preferably 50°C or lower, more preferably 40°C or lower.
- the lower limit temperature of the cooling is not particularly limited, but the temperature is preferably such that the reaction solution does not freeze.
- the composite hydroxide (YSZ precursor) is highly dispersed in the zirconium sulfate. Since the composite hydroxide contains a large amount of yttrium, stabilized zirconia having a high melting point is highly dispersed in the finally obtained zirconium composite oxide. As a result, the finally obtained zirconium composite oxide has a high sintering suppression effect.
- the second step has been explained above.
- a cerium salt solution or compound is added to the basic zirconium sulfate-containing reaction solution (third step).
- a salt solution or compound of one or more metals selected from rare earth elements (including yttrium) other than cerium may be added.
- the first step and the second step are preferably carried out in an autoclave in which temperature and pressure can be easily controlled.
- zirconium hydroxide is obtained by neutralizing a basic zirconium sulfate-containing reaction solution with an alkali.
- the alkali is not limited, and for example, ammonium hydroxide, ammonium bicarbonate, sodium hydroxide, potassium hydroxide and the like can be used. Among these, sodium hydroxide is preferable from the viewpoint of industrial cost.
- the amount of alkali added is not particularly limited as long as zirconium hydroxide can be produced as a precipitate from the basic zirconium sulfate-containing reaction solution. It is usually added so that the pH of the above solution becomes 11 or higher, preferably 12 or higher.
- the zirconium hydroxide-containing solution is preferably kept at 35-60°C for 1 hour or more. As a result, the generated precipitate is matured and is easily separated by filtration.
- zirconium hydroxide is recovered by a solid-liquid separation method.
- filtration, centrifugation, decantation, etc. can be used.
- the zirconium hydroxide may be dried by natural drying or heat drying.
- a zirconium composite oxide is obtained by heat-treating (firing) the zirconium hydroxide.
- the heat treatment temperature is not particularly limited, it is preferably about 400 to 900° C. for about 1 to 5 hours.
- the heat treatment atmosphere is preferably in air or in an oxidizing atmosphere.
- the obtained zirconium composite oxide may be subjected to deagglomeration treatment (crushing treatment) for the purpose of improving handling properties, etc., if necessary.
- the zirconium composite oxides obtained in Examples and Comparative Examples contain 1.3 to 2.5% by mass of hafnium oxide relative to zirconium oxide as an unavoidable impurity (calculated by the following formula (X)). are doing. ⁇ Formula (X)> ([mass of hafnium oxide]/([mass of zirconium oxide] + [mass of hafnium oxide])) ⁇ 100 (%)
- Example 1 [Preparation of zirconium composite oxide] (Example 1) ⁇ First step> 92 g of zirconium oxychloride octahydrate (35 g in terms of ZrO2) was dissolved in ion - exchanged water and mixed with 200 g of yttrium chloride solution ( 20 g in terms of Y2O3) to obtain ZrO2 and Y2 in terms of oxides. It was prepared so that the total concentration with O 3 was 5 w/v % (mass volume percent).
- YSZ precursor 25 mass % NaOH was added to the prepared solution (yttrium/zirconium salt mixed solution) to obtain a composite hydroxide containing Zr and Y (YSZ precursor). After filtration and washing, the YSZ precursor was heated to 150° C. in an autoclave and held at a pressure of 5 ⁇ 10 5 Pa for 60 minutes to obtain a YSZ precursor slurry.
- the YSZ precursor contains 23 mol % of yttrium as calculated from the charge ratio.
- ⁇ Second step> After that, a mixed solution of zirconium salt solution (ZrO 2 concentration 25 w/v%) in which 45 g of zirconium oxychloride octahydrate (converted to ZrO 2 : 17 g) was dissolved in ion-exchanged water and 50 g of 25% by mass sodium sulfate were mixed. was added dropwise to the YSZ precursor slurry at 120° C., held for 15 minutes, and then cooled to obtain a basic zirconium sulfate-containing reaction solution.
- ZrO 2 concentration 25 w/v% zirconium oxychloride octahydrate (converted to ZrO 2 : 17 g) was dissolved in ion-exchanged water and 50 g of 25% by mass sodium sulfate were mixed. was added dropwise to the YSZ precursor slurry at 120° C., held for 15 minutes, and then cooled to obtain a basic zircon
- ⁇ Third step> 200 g of cerium nitrate solution (converted to CeO2: 20 g), 50 g of neodymium nitrate solution (converted to Nd2O3 : 5 g), and 50 g of praseodymium nitrate solution (converted to Pr6O11 : 5 g) were added to the basic zirconium sulfate-containing reaction solution. ) was added, and 25% by weight sodium hydroxide was added until the pH reached 13 or higher to produce a hydroxide precipitate (zirconium hydroxide-containing slurry).
- the resulting hydroxide precipitate was filtered, thoroughly washed with water, and the resulting hydroxide was dried at 105°C for 24 hours.
- the dried hydroxide was heat-treated (calcined) in air at 700° C. for 5 hours to obtain an oxide.
- the resulting oxide was pulverized in a mortar to obtain a zirconium composite oxide according to Example 1.
- Table 1 shows the composition of the zirconium composite oxide calculated from the charging ratio.
- Example 2 to Example 2 in the same manner as in Example 1 except that the ratio of the materials added in the first step, the second step, and the third step was adjusted so that the composition ratio shown in Table 1 was obtained.
- a zirconium composite oxide according to No. 9 was obtained.
- a lanthanum nitrate solution was further added in the third step so as to achieve the composition ratio shown in Table 1.
- a phosphoric acid solution was further added in the third step so as to achieve the composition ratio shown in Table 1.
- the mixture was allowed to cool to room temperature to obtain a basic zirconium sulfate-containing slurry.
- 199 g of cerium nitrate solution (20 g as CeO2), 75 g of neodymium nitrate solution (7.5 g as Nd2O3 ) and 25 g of praseodymium nitrate solution ( 2.5 g as Pr6O11 ) were added to the basic zirconium sulfate - containing slurry. was added.
- 500 g of 25% by weight sodium hydroxide was added over 60 minutes. This neutralization produced zirconium hydroxide.
- the zirconium hydroxide-containing slurry was filtered, washed with water, and fired at 700° C. for 5 hours to obtain an oxide.
- Comparative example 2 A zirconium composite oxide was obtained in the same manner as in Comparative Example 1, except that the ratio of materials was adjusted so as to achieve the composition ratio shown in Table 1. Further, instead of the neodymium nitrate solution, an yttrium nitrate solution was added so as to achieve the composition ratio shown in Table 1.
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Abstract
Description
5質量%以上50質量%以下の酸化イットリウムと、
酸化セリウムとを含み、
1250℃で10時間加熱した後の比表面積が、3.0m2/g以上20.0m2/g以下であることを特徴とする。
また、1250℃で10時間加熱した後の比表面積が、3.0m2/g以上であるため、1200℃を超えるより高温に晒されたとしても、高い比表面積を有すると言える。
このように、前記構成によれば、酸化イットリウムを5質量%以上という高含有量で含み、且つ、焼結抑制効果を有する酸化セリウムを含み、1250℃で10時間加熱した後の比表面積が、3.0m2/g以上であるため、1200℃を超えるより高温に晒されたとしても、高い比表面積を維持することが可能である。
Zrと酸化物換算で20mol%以上30mol%以下のYとを含む複合水酸化物を得る第1工程、
硫酸塩化剤とジルコニウム塩溶液との混合液と、前記複合水酸化物と、を混合することにより塩基性硫酸ジルコニウム含有反応液を得る第2工程、及び、
前記塩基性硫酸ジルコニウム含有反応液に、セリウムの塩溶液、又は、化合物を添加する第3工程を有することを特徴とする。
前記複合水酸化物は、焼成することにより安定化ジルコニア(以下、「YSZ」ともいう)となる。前記複合水酸化物は、イットリウムを多く含むため、最終的に得られるジルコニウム複合酸化物には、高い融点を有する安定化ジルコニアが高分散された状態となる。その結果、最終的に得られるジルコニウム複合酸化物は、高い焼結抑制効果が得られることになる。
また、前記塩基性硫酸ジルコニウム含有反応液に、セリウムの塩溶液、又は、化合物を添加するため、最終的に得られるジルコニウム複合酸化物は、焼結抑制効果を有する酸化セリウムを含むことになる。その結果、最終的に得られるジルコニウム複合酸化物は、より高い焼結抑制効果が得られることになる。
本実施形態に係るジルコニウム複合酸化物は、詳しくは後述するが、ジルコニアを必須成分とし、ジルコニア以外の酸化物(他の金属酸化物)との複合酸化物である。本実施形態に係るジルコニウム複合酸化物の用途は、特に限定されないが、排ガス浄化用触媒の酸素貯蔵材料として有用である。排ガス浄化用触媒の酸素貯蔵材料として使用する場合、当該酸素貯蔵材料に担持し得る触媒としては、貴金属触媒などが挙げられる。
[1.1250℃で10時間加熱した後の比表面積]
前記ジルコニウム複合酸化物は、1250℃で10時間加熱した後の比表面積が、3.0m2/g以上20.0m2/g以下である。1250℃で10時間加熱した後の比表面積が3.0m2/g以上であるため、1200℃を超えるより高温に晒されたとしても、高い比表面積を有すると言える。
前記1250℃で10時間加熱した後の比表面積は、大きいほど好ましいが、例えば、18m2/g以下、15m2/g以下、14m2/g以下等である。
前記ジルコニウム複合酸化物は、1200℃で10時間加熱した後の比表面積が、12.0m2/g以上40.0m2/g以下であることが好ましい。1200℃で10時間加熱した後の比表面積が、12.0m2/g以上であると、1200℃に晒された場合にも、高い比表面積を維持することが可能である。
前記1200℃で10時間加熱した後の比表面積は、大きいほど好ましいが、例えば、35m2/g以下、30m2/g以下、25m2/g以下、20m2/g以下等である。
前記ジルコニウム複合酸化物は、1200℃で3時間加熱した後の比表面積が、14m2/g以上50m2/g以下であることが好ましい。1200℃で3時間加熱した後の比表面積が、14m2/g以上であると、触媒担体として好適に使用できる。
前記1200℃で3時間加熱した後の比表面積は、大きいほど好ましいが、例えば、45m2/g以下、40m2/g以下、35m2/g以下、30m2/g以下である。
前記ジルコニウム複合酸化物は、1100℃で3時間加熱した後の比表面積が、20m2/g以上60m2/g以下であることが好ましい。1100℃で3時間加熱した後の比表面積が、20m2/g以上であると、触媒担体として好適に使用できる。
前記1100℃で3時間加熱した後の比表面積は、大きいほど好ましいが、例えば、55m2/g以下、50m2/g以下、45m2/g以下等である。
前記ジルコニウム複合酸化物は、1000℃で3時間加熱した後の比表面積が、30m2/g以上80m2/g以下であることが好ましい。1000℃で3時間加熱した後の比表面積が、30m2/g以上であると、触媒担体として好適に使用できる。
前記1000℃で3時間加熱した後の比表面積は、大きいほど好ましいが、例えば、75m2/g以下、70m2/g以下、65m2/g以下等である。
前記ジルコニウム複合酸化物は、比表面積(初期の比表面積)が、40m2/g以上であることが好ましい。比表面積が、40m2/g以上であると、高温に曝される前の状態において比較的高い比表面積を有するといえる。高温に曝される前の状態において比較的高い比表面積を有するため、高温に晒された後の比表面積をより高めることができる。ここで、比表面積(初期の比表面積)とは、ジルコニウム複合酸化物を製造した後の、加熱処理や粉砕処理等を行っていない状態での比表面積をいう。
前記比表面積は、大きいほど好ましいが、例えば、110m2/g以下、100m2/g以下、90m2/g以下等である。
[1.1250℃で10時間加熱した後の細孔容積]
本実施形態に係るジルコニウム複合酸化物は、1250℃で10時間加熱した後の細孔容積が0.02ml/g以上であることが好ましい。1250℃で10時間加熱した後の細孔容積が0.02ml/g以上であると、高温に晒されたとしても細孔の収縮が少ないと言える。従って、1250℃で10時間加熱した後の比表面積をより高めることができる。
前記1250℃で10時間加熱した後の細孔容積は、大きいほど好ましいが、例えば、0.4ml/g以下、0.3ml/g以下、0.25ml/g以下、0.20ml/g以下等である。
本実施形態に係るジルコニウム複合酸化物は、細孔容積(初期の細孔容積)が0.4ml/g以上であることが好ましい。前記細孔容積が0.4ml/g以上であると、高温に曝される前の状態において比較的高い細孔容積を有する。高温に曝される前の状態において比較的高い細孔容積を有するため、高温に晒された後の細孔容積をより高めることができる。高温に晒された後の細孔容積をより高めることができるため、高温に晒された後の比表面積をより高めることができる。
前記細孔容積は、大きいほど好ましいが、例えば、1.0ml/g以下、0.9ml/g以下、0.8ml/g以下等である。
前記ジルコニウム複合酸化物の粒子径D50は、好ましくは0.1μm以上100μm以下である。前記粒子径D50は、より好ましくは0.5μm以上50μm以下である。
前記ジルコニウム複合酸化物は、ジルコニア(酸化ジルコニウム)を含有する。前記ジルコニアの含有量は、前記ジルコニウム複合酸化物全体を100質量%としたとき、好ましくは30質量%以上、より好ましくは35質量%以上、さらに好ましくは40質量%以上、特に好ましくは43質量%以上、特別に好ましくは45質量%以上である。前記ジルコニアの含有量の上限値は、特に制限されないが、前記ジルコニアの含有量は、好ましくは95質量%以下、より好ましくは92質量%以下、さらに好ましくは90質量%以下、特に好ましくは85質量%以下、特別に好ましくは80質量%以下、格別に好ましくは75質量%以下である。前記ジルコニアの含有量が30質量%以上95質量%以下であると、触媒担体として好適に使用できる。
なお、前記ジルコニウム複合酸化物が安定化ジルコニアを含む場合、前記ジルコニウム複合酸化物に含まれるジルコニアの含有量は、安定化ジルコニアを構成するジルコニアと、それ以外のジルコニアとの合計量となる。
なお、前記ジルコニウム複合酸化物が安定化ジルコニアを含む場合、前記ジルコニウム複合酸化物に含まれる酸化イットリウムの含有量には、安定化ジルコニアを構成する酸化イットリウムが含まれる。
なお、希土類元素とは、Sc、Y、La、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luをいう。
A)In、Si、P、Sn、Bi及びZnからなる群から選ばれる1種以上の酸化物
B)遷移金属酸化物(但し、希土類元素及び貴金属元素の酸化物を除く)、及び、
C)アルカリ土類金属酸化物
からなる群から選ばれる1種以上の元素の酸化物を含むことができる。
以下、A)~C)で示した元素を、本明細書では、「その他の元素」ということとする。前記ジルコニウム複合酸化物が前記その他の元素の酸化物を含む場合、前記その他の元素の酸化物の含有量は、前記ジルコニウム複合酸化物全体を100質量%としたとき、酸化物換算で0.1質量%以上とすることができる。前記その他の元素の酸化物の含有量は、上限に制限は特にないが、20質量%以下、10質量%以下、7質量%以下、5質量%以下等とすることができる。
前記遷移金属としては、例えば、Ti、V、Cr、Mn、Fe、Co、Ni、Cu、Nb、Mo、Ta、W等が挙げられる。前記アルカリ土類金属としては、Mg、Ca、Sr、Ba等が挙げられる。
前記安定化ジルコニアに含まれる酸化イットリウムの含有量は、安定化ジルコニア全体に対して、より好ましくは28mol%以下、さらに好ましくは26mol%以下である。
(1) 酸化ジルコニウム;30%以上95%以下
酸化イットリウム;5%以上40%以下
酸化セリウム;5%以上50%以下
酸化イットリウム、酸化セリウム以外の希土類酸化物;0%以上30%以下
その他の元素の酸化物;0%以上10%以下
(2) 酸化ジルコニウム;35%以上92%以下
酸化イットリウム;10%以上40%以下
酸化セリウム;7.5%以上47.5%以下
酸化イットリウム、酸化セリウム以外の希土類酸化物;1%以上20%以下
その他の元素の酸化物;0%以上5%以下
(3) 酸化ジルコニウム;40%以上90%以下
酸化イットリウム;15%以上37.5%以下
酸化セリウム;10%以上45%以下
酸化イットリウム、酸化セリウム以外の希土類酸化物;2.5%以上15%以下
その他の元素の酸化物;0%以上2.5%以下
(4) 酸化ジルコニウム;43%以上85%以下
酸化イットリウム;20%以上35%以下
酸化セリウム;12.5%以上41%以下
酸化イットリウム、酸化セリウム以外の希土類酸化物;4%以上10%以下
その他の元素の酸化物;0%以上1%以下
以下、ジルコニウム複合酸化物の製造方法の一例について説明する。ただし、本発明のジルコニウム複合酸化物の製造方法は、以下の例示に限定されない。
Zrと酸化物換算で20mol%以上30mol%以下のYとを含む複合水酸化物を得る第1工程、
硫酸塩化剤とジルコニウム塩溶液との混合液と、前記複合水酸化物と、を混合することにより塩基性硫酸ジルコニウム含有反応液を得る第2工程、及び、
前記塩基性硫酸ジルコニウム含有反応液に、セリウムの塩溶液、又は、化合物を添加する第3工程を有する。
本実施形態に係るジルコニウム複合酸化物の製造方法においては、まず、Zrと酸化物換算で20mol%以上30mol%以下のYとを含む複合水酸化物を得る。
次に、硫酸塩化剤とジルコニウム塩溶液との混合液と、前記複合水酸化物(YSZ前駆体)と、を混合し、加熱することにすることにより塩基性硫酸ジルコニウム含有反応液を得る(第2工程)。
前記混合液と前記複合水酸化物との混合温度としては、110℃~150℃が好ましい。
前記複合水酸化物は、イットリウムを多く含むため、最終的に得られるジルコニウム複合酸化物には、高い融点を有する安定化ジルコニアが高分散された状態となる。その結果、最終的に得られるジルコニウム複合酸化物は、高い焼結抑制効果が得られることになる。
その後、前記塩基性硫酸ジルコニウム含有反応液に、セリウムの塩溶液、又は、化合物を添加する(第3工程)。第3工程においては、さらに、セリウム以外の希土類元素(イットリウムを含む)から選ばれる1種又は2種以上の金属の塩溶液、又は、化合物を添加してもよい。
<式(X)>
([酸化ハフニウムの質量]/([酸化ジルコニウムの質量]+[酸化ハフニウムの質量]))×100(%)
また、以下の実施例で示される測定値の最大値、最小値は、各成分の含有量(組成)に関係なく、本発明の好ましい最小値、最大値であると考慮されるべきである。
(実施例1)
<第1工程>
オキシ塩化ジルコニウム・8水和物92g(ZrO2換算:35g)をイオン交換水で溶解し、塩化イットリウム溶液200g(Y2O3換算:20g)と混合し、酸化物換算でZrO2とY2O3との合計の濃度が5w/v%(質量体積パーセント)となるように調製した。
その後、オキシ塩化ジルコニウム・8水和物45g(ZrO2換算:17g)をイオン交換水に溶解したジルコニウム塩溶液(ZrO2濃度25w/v%)と25質量%硫酸ナトリウム50gとを混合した混合溶液を、120℃で前記YSZ前駆体スラリーに滴下し、15分間保持し、その後冷却し、塩基性硫酸ジルコニウム含有反応液を得た。
次に、前記塩基性硫酸ジルコニウム含有反応液に硝酸セリウム溶液200g(CeO2換算:20g)、硝酸ネオジム溶液50g(Nd2O3換算:5g)、硝酸プラセオジム溶液50g(Pr6O11換算:5g)を添加し、25質量%水酸化ナトリウムをpHが13以上になるまで添加し、水酸化物沈殿(水酸化ジルコニウム含有スラリー)を生成させた。
表1に記載の組成比率となるように、第1工程、第2工程、第3工程で添加する材料の比率を調整したこと以外は、実施例1と同様にして、実施例2~実施例9に係るジルコニウム複合酸化物を得た。なお、実施例2、実施例7においては、表1に記載の組成比率となるように、第3工程において、さらに、硝酸ランタン溶液を添加した。実施例9においては、表1に記載の組成比率となるように、第3工程において、さらに、リン酸溶液を添加した。
オキシ塩化ジルコニウム・8水和物182g(ZrO2換算:70g)をイオン交換水に溶解し、次に35%塩酸及びイオン交換水により酸濃度が0.67N、ZrO2濃度が4w/v%となるように調整した。得られた溶液をオートクレーブに入れて圧力を2×105Paとし、120℃まで昇温させて同温度で5質量%硫酸ナトリウム1035gを添加し、更に15分間保持した。硫酸塩化後、室温になるまで放冷し、塩基性硫酸ジルコニウム含有スラリーを得た。塩基性硫酸ジルコニウム含有スラリーに硝酸セリウム溶液199g(CeO2換算:20g)、硝酸ネオジム溶液75g(Nd2O3換算:7.5g)及び硝酸プラセオジム溶液25g(Pr6O11換算:2.5g)を添加した。次に、25質量%水酸化ナトリウム500gを60分間かけて添加した。この中和により、水酸化ジルコニウムを生成させた。次に、水酸化ジルコニウム含有スラリーを濾過・水洗した後、700℃で5時間焼成して酸化物を得た。
表1に記載の組成比率となるように材料の比率を調整したこと以外は、比較例1と同様にしてジルコニウム複合酸化物を得た。なお、表1に記載の組成比率となるように、さらに、硝酸ネオジム溶液の代わりに硝酸イットリウム溶液を添加した。
実施例、比較例のジルコニウム複合酸化物の比表面積を、比表面積計(「マックソーブ」マウンテック製)を用いてBET法にて測定した。結果を表1に示す。
実施例、比較例のジルコニウム複合酸化物について、大気圧(0.1013MPa)、空気雰囲気下、1000℃で3時間加熱した。1000℃で3時間加熱した後のジルコニウム複合酸化物の比表面積を、「加熱処理前の比表面積の測定」と同様にして測定した。結果を表1に示す。
実施例、比較例のジルコニウム複合酸化物について、大気圧(0.1013MPa)、空気雰囲気下、1100℃で3時間加熱した。1100℃で3時間加熱した後のジルコニウム複合酸化物の比表面積を、「加熱処理前の比表面積の測定」と同様にして測定した。結果を表1に示す。
実施例、比較例のジルコニウム複合酸化物について、大気圧(0.1013MPa)、空気雰囲気下、1200℃で3時間加熱した。1200℃で3時間加熱した後のジルコニウム複合酸化物の比表面積を、「加熱処理前の比表面積の測定」と同様にして測定した。結果を表1に示す。
実施例、比較例のジルコニウム複合酸化物について、大気圧(0.1013MPa)、空気雰囲気下、1200℃で10時間加熱した。1200℃で10時間加熱した後のジルコニウム複合酸化物の比表面積を、「加熱処理前の比表面積の測定」と同様にして測定した。結果を表1に示す。
実施例、比較例のジルコニウム複合酸化物について、大気圧(0.1013MPa)、空気雰囲気下、1250℃で10時間加熱した。1250℃で10時間加熱した後のジルコニウム複合酸化物の比表面積を、「加熱処理前の比表面積の測定」と同様にして測定した。結果を表1に示す。
細孔容量及び細孔径は、測定装置「Belsorp mini II(MicrotracBEL社製)」を用い、BJH法により測定した。
実施例、比較例のジルコニウム複合酸化物について、大気圧(0.1013MPa)、空気雰囲気下、1250℃で10時間加熱した。1250℃で10時間加熱した後のジルコニウム複合酸化物の比表面積を、「加熱処理前の比表面積の測定」と同様にして測定した。結果を表1に示す。
実施例、比較例のジルコニウム複合酸化物(粉末)0.15gと40mlの0.2%ヘキサメタリン酸ナトリウム水溶液とを50mlビーカーに投入し、超音波ホモジナイザー「Digital Sonifier 450」(Branson製)で5分間分散した後、装置(レーザー回折式粒子径分布測定装置(「SALD-2300」島津製作所社製))に投入し測定した。結果を表1に示す。
Claims (14)
- 5質量%以上50質量%以下の酸化イットリウムと、
酸化セリウムとを含み、
1250℃で10時間加熱した後の比表面積が、3.0m2/g以上20.0m2/g以下であることを特徴とするジルコニウム複合酸化物。 - 前記酸化イットリウムの含有量が、40質量%以下であることを特徴とする請求項1に記載のジルコニウム複合酸化物。
- 前記酸化セリウムの含有量が、5質量%以上50質量%以下であることを特徴とする請求項1又は2に記載のジルコニウム複合酸化物。
- セリウム、イットリウム以外の希土類元素から選ばれる1種以上の酸化物を含むことを特徴とする請求項1~3のいずれか1に記載のジルコニウム複合酸化物。
- 前記酸化物は、酸化ランタン、酸化ネオジム、及び、酸化プラセオジムからなる群から選ばれる1種以上の酸化物であることを特徴とする請求項4に記載のジルコニウム複合酸化物。
- 前記酸化ランタンの含有量が、1質量%以上30質量%以下であることを特徴とする請求項5に記載のジルコニウム複合酸化物。
- 前記酸化ネオジムの含有量が、1質量%以上30質量%以下であることを特徴とする請求項5に記載のジルコニウム複合酸化物。
- 前記酸化プラセオジムの含有量が、1質量%以上30質量%以下であることを特徴とする請求項5に記載のジルコニウム複合酸化物。
- 酸化イットリウムを20mol%以上30mol%以下含む安定化ジルコニアを含むことを特徴とする請求項1~8のいずれか1に記載のジルコニウム複合酸化物。
- 1200℃で10時間加熱した後の比表面積が、12.0m2/g以上40.0m2/g以下であることを特徴とする請求項1~9のいずれか1に記載のジルコニウム複合酸化物。
- 細孔容積が0.4ml/g以上1.0ml/g以下であることを特徴とする請求項1~10のいずれか1に記載のジルコニウム複合酸化物。
- 排ガス浄化用触媒の酸素貯蔵材料であることを特徴とする請求項1~11のいずれか1に記載のジルコニウム複合酸化物。
- 請求項1~12のいずれか1に記載のジルコニウム複合酸化物の製造方法であって、
Zrと酸化物換算で20mol%以上30mol%以下のYとを含む複合水酸化物を得る第1工程、
硫酸塩化剤とジルコニウム塩溶液との混合液と、前記複合水酸化物と、を混合することにより塩基性硫酸ジルコニウム含有反応液を得る第2工程、及び、
前記塩基性硫酸ジルコニウム含有反応液に、セリウムの塩溶液、又は、化合物を添加する第3工程を有することを特徴とするジルコニウム複合酸化物の製造方法。 - 前記第3工程は、塩基性硫酸ジルコニウム含有反応液に、さらに、セリウム、イットリウム以外の希土類元素から選ばれる1種又は2種以上の金属の塩溶液、又は、化合物を添加する工程を有することを特徴とする請求項13に記載のジルコニウム複合酸化物の製造方法。
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