JP6941624B2 - セリウムおよびジルコニウムベースの混合酸化物 - Google Patents
セリウムおよびジルコニウムベースの混合酸化物 Download PDFInfo
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- JP6941624B2 JP6941624B2 JP2018555561A JP2018555561A JP6941624B2 JP 6941624 B2 JP6941624 B2 JP 6941624B2 JP 2018555561 A JP2018555561 A JP 2018555561A JP 2018555561 A JP2018555561 A JP 2018555561A JP 6941624 B2 JP6941624 B2 JP 6941624B2
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- Prior art keywords
- mixed oxide
- oxide
- cerium
- zirconium
- mixed
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- 229910052684 Cerium Inorganic materials 0.000 title claims description 61
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 title claims description 58
- 229910052726 zirconium Inorganic materials 0.000 title claims description 38
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 title claims description 37
- 239000011148 porous material Substances 0.000 claims description 63
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 46
- 150000002910 rare earth metals Chemical class 0.000 claims description 46
- 239000000203 mixture Substances 0.000 claims description 38
- 229910052746 lanthanum Inorganic materials 0.000 claims description 34
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 16
- 229910052735 hafnium Inorganic materials 0.000 claims description 16
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 14
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 14
- 229910052753 mercury Inorganic materials 0.000 claims description 14
- 229910052727 yttrium Inorganic materials 0.000 claims description 14
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical group [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 14
- 239000011247 coating layer Substances 0.000 claims description 13
- 238000001354 calcination Methods 0.000 claims description 12
- 238000002459 porosimetry Methods 0.000 claims description 9
- 230000003197 catalytic effect Effects 0.000 claims description 8
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 8
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 229910052779 Neodymium Inorganic materials 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 7
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 7
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical class [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 claims description 5
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims description 5
- 229910052718 tin Inorganic materials 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 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 4
- 239000000843 powder Substances 0.000 claims description 4
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 229910000449 hafnium oxide Inorganic materials 0.000 claims description 3
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 229910006404 SnO 2 Inorganic materials 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910021536 Zeolite Inorganic materials 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 150000004679 hydroxides Chemical class 0.000 claims description 2
- 229910010272 inorganic material Inorganic materials 0.000 claims description 2
- 239000011147 inorganic material Substances 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910052596 spinel Inorganic materials 0.000 claims description 2
- 239000011029 spinel Substances 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- 239000010457 zeolite Substances 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 1
- 239000000243 solution Substances 0.000 description 65
- 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 45
- 238000003756 stirring Methods 0.000 description 42
- 239000000725 suspension Substances 0.000 description 40
- 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 34
- 239000002244 precipitate Substances 0.000 description 26
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 25
- 229910002651 NO3 Inorganic materials 0.000 description 20
- 235000011114 ammonium hydroxide Nutrition 0.000 description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 19
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 19
- 239000007864 aqueous solution Substances 0.000 description 19
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 16
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 14
- 239000000047 product Substances 0.000 description 13
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 11
- 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 11
- 239000003795 chemical substances by application Substances 0.000 description 9
- 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 8
- 239000005639 Lauric acid Substances 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 7
- 239000002609 medium Substances 0.000 description 7
- -1 nitrates Chemical class 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 7
- 150000001768 cations Chemical class 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 229910000510 noble metal Inorganic materials 0.000 description 6
- 239000010948 rhodium Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 150000007514 bases Chemical class 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000012153 distilled water Substances 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 4
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000012452 mother liquor Substances 0.000 description 4
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- 230000009467 reduction Effects 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
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- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 3
- 150000002191 fatty alcohols Chemical class 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
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- 239000002245 particle Substances 0.000 description 3
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- 239000007858 starting material Substances 0.000 description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
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- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 2
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- 150000001991 dicarboxylic acids Chemical class 0.000 description 2
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- 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 2
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Description
「多機能性」触媒が現在、内燃エンジンからの排ガスの処理(自動車再燃触媒反応)のために使用されている。多機能性は、特に、排気ガス中に存在する一酸化炭素および炭化水素の酸化のみならず、特に、これらのガス中にまた存在する窒素酸化物の還元をも実施することができる触媒(「三元」触媒)を意味すると理解される。
比表面積は、窒素吸着によって測定されるBET比表面積を意味すると理解される。これは、定期刊行物「The Journal of the American Chemical Society」,60,309(1938)に記載されるBrunauer−Emmett−Teller法から策定された標準ASTM D3663−03に従って得られる。省略形ST(℃)/x(h)は、x時間の期間、℃単位で表される、温度Tでの組成物のか焼後に、上に記載されたようなBET法によって得られる、組成物の比表面積を意味するために用いられる。例えば、S1000℃/4hは、1000℃で4h組成物のか焼後の組成物のBET比表面積を意味する。所与の温度および所与の期間についてのか焼は、特に明記しない限り、固定温度で示された期間にわたっての空気下でのか焼に相当する。製造業者により推奨される指示に従うことによって試料に関してMicromeritics製のTristar II 3020装置を用いることが可能である。
8%〜45%のセリウム;
1%〜10%のランタン;
0%〜15%のセリウムおよびランタン以外の希土類金属;
ジルコニウムとしての残り
であり、
混合酸化物が、
1100℃の温度で4時間のか焼後に、少なくとも30m2/gのBET比表面積;
1000℃の温度で4時間のか焼後に、少なくとも55m2/gのBET比表面積
を示すこと;
ならびに1100℃の温度で4時間か焼後の混合酸化物に関する水銀ポロシメトリーによって得られる導関数曲線(dV/dlogD)が、200nm以下の直径の細孔の範囲において、最大値が、24〜34nmの細孔径Dp,1100℃/4hに相当するピークを示すことを特徴とし、VおよびDがそれぞれ、細孔容積および細孔径を意味する混合酸化物である。
8%〜45%の酸化セリウム;
1%〜10%の酸化ランタン;
希土類金属がセリウムおよびランタン以外である、0%〜15%の少なくとも1種の希土類金属酸化物;
0%〜2.5%の酸化ハフニウム;
酸化ジルコニウムとしての残り
であり、
混合酸化物が、
1100℃の温度で4時間のか焼後に、少なくとも30m2/gのBET比表面積;
1000℃の温度で4時間のか焼後に、少なくとも55m2/gのBET比表面積
を示すこと;
ならびに1100℃の温度で4時間か焼後の混合酸化物に関する水銀ポロシメトリーによって得られる導関数曲線(dV/dlogD)が、200nm以下の直径の細孔の範囲において、最大値が、24〜34nmの細孔径Dp,1100℃/4hに相当するピークを示すことを特徴とし、VおよびDがそれぞれ、細孔容積および細孔径を意味する。
ジルコニウムおよび任意選択的にハフニウム、セリウム、ランタン、イットリウム;または
ジルコニウムおよび任意選択的にハフニウム、セリウム、ランタン、イットリウム、ネオジム;または
ジルコニウムおよび任意選択的にハフニウム、セリウム、ランタン、イットリウム、プラセオジム;または
ジルコニウムおよび任意選択的にハフニウム、セリウム、ランタン
であってもよい。
[式中:
V1は、nm単位での直径が(Dp,1100℃/4h−15)〜(Dp,1100℃/4h+15)である細孔によって成長させられた細孔容積であり;
V2は、直径が200nm以下である細孔によって成長させられた細孔容積であり;
V1およびV2は、1100℃で4hか焼後の混合酸化物に関して水銀ポロシメトリーによって測定される]
によって定義される、比Rを用いて実証され得る。
(a1)硝酸セリウムの水溶液および硝酸ジルコニウムの水溶液が、塩基性水溶液を含有する攪拌容器へ導入される工程;
(a2)硝酸ランタンのおよび混合酸化物中に任意選択的に存在する希土類金属(REM)の硝酸塩の水溶液がその後、攪拌状態に保たれた、工程(a1)において形成された混合物へ導入される工程;
(a3)工程(a2)の終わりに得られた懸濁液が、攪拌下で加熱される工程;
(a4)テンプレート剤がその後、先行工程において得られた懸濁液へ導入される工程;
(a5)任意選択的に、懸濁液が濾過され、沈澱物が洗浄される工程;
(a6)工程(a5)の終わりに得られた沈澱物が、混合酸化物を得るために700℃〜1100℃の温度でか焼される工程;
(a7)工程(a6)において得られた混合酸化物が任意選択的にすり潰されてもよい工程
を含む。
2CO+O2→2CO2
2NO+2CO→N2+2CO2
4CxHy+(4x+y)O2→4xCO2+2yH2О
であり得る。
硝酸セリウムおよび硝酸ジルコニウムの溶液を、95.43リットルの水、11.3リットルの水性硝酸ジルコニウム溶液([ZrO2]=266g/l;密度=1.408kg/l)およびまた5.8リットルの水性硝酸セリウム溶液([CeO2]=259g/l;密度=1.439kg/l)を、容器へ、導入することによって調製する。硝酸ランタンおよび硝酸イットリウムの水溶液をまた、10.77リットルの水、0.53リットルの硝酸ランタン溶液([La2O3]=472.5g/l;密度=1.711kg/l)および1.2リットルの硝酸イットリウム溶液[Y2O3]=208.5g/l;密度=1.391kg/l)を、別の容器へ、導入することによって調製する。
硝酸セリウムおよび硝酸ジルコニウムの溶液を、100.3リットルの水、11.1リットルの硝酸ジルコニウム溶液([ZrO2]=266g/l;密度=1.408kg/l)およびまた6.8リットルの硝酸セリウム溶液([CeO2]=259g/l;密度=1.439kg/l)を、容器へ、導入することによって調製する。硝酸ランタンおよび硝酸イットリウムの水溶液をまた、6.29リットルの水および0.58リットルの水性硝酸ランタン溶液([La2O3]=472.5g/l;密度=1.711kg/l)を、別の容器へ、導入することによって調製する。
硝酸塩の溶液を、32.4リットルの水性硝酸ジルコニウム溶液([ZrO2]=278g/l;密度=1.413kg/l)、17.2リットルの水性硝酸セリウム溶液([CeO2]=262g/l;密度=1445kg/l)、1.59リットルの水性硝酸ランタン溶液([La2O3]=472.5g/l;密度=1.711kg/l)および3.5リットルの水性硝酸イットリウム溶液([Y2O3]=217g/l;密度=1.39kg/l)を、容器へ、導入することによって調製する。溶液をその後、70.4リットルの硝酸塩の溶液を得るように、蒸留水でメイクアップする。
STcal/3hはしたがって、調製プロセスの終わりに得られるような「フレッシュ」混合酸化物のBET比表面積を意味する。
実施例1、17および18の混合酸化物(同じ割会のZr−Ce−La−Y−Nd酸化物60−30−5−6−0を有する)に硝酸RhIIIを含浸させる。混合酸化物を硝酸RhIIIの溶液(この溶液の容積は総細孔容積よりも大きい)と接触させ、水を次に蒸発させ、か焼を500℃で4h実施する。全体としての触媒に対してロジウムの割合は0.1重量%である。
熟成は、10%H2Oの存在下で5分毎に2%COおよび2%O2(CO、O2およびH2Oについての%値は、容積で与えられる)を交互注入して、レドックス環境中の熟成試験台上で実施する。用いられるガス流量は、STP条件下で70cc/分であり、試験される含浸混合酸化物の重量は2.5gである。最後の注入は、酸化性(2%O2)である。熟成温度は、6時間の全継続時間の間1100℃である。
温度プログラム化還元(TPR)は、それ自体また制御されるガス流れ下でプログラム化温度に試料がかけられるときに試料によって消費された水素の容積を測定することを可能にする。この装置は、ガスの通過を制御することを可能にする一連のソレノイドバルブから、異なるラインにおける流量を固定することを可能にする一連のバルク流量計から、ガス流れを導くことを可能にする一連の切り替え弁から、試料を含有し、そしてガスマニホールドに接続された(U字型)石英反応器(下降流流動床反応器、温度は、反応器中に置かれた熱電対によってとられる)から、その中に反応器が置かれるオーブンから、H2Oトラップから、ならびにガス混合物の成分を分析することを可能にするカサロメーター(TCD)からなる。
TPRは、10%O2の存在下で試料を500℃にした後、周囲温度から10℃/分の温度勾配により水素の流れ(10容積%H2を含むH2/Ar)下で試料を900℃にすることによって実施する。
Claims (24)
- ジルコニウム、セリウム、ランタン、ならびに任意選択的にセリウムおよびランタン以外の少なくとも1種の希土類金属(REM)の混合酸化物であって、前記混合酸化物の総重量に対して、酸化物当量として表される、これらの元素の重量割合が、次のとおり:
8%〜45%のセリウム;
1%〜10%のランタン;
0%〜15%の、セリウムおよびランタン以外の希土類金属;
ジルコニウムとしての残り
であり、
前記混合酸化物が、
1100℃の温度で4時間のか焼後に、少なくとも30m2/gのBET比表面積;
1000℃の温度で4時間のか焼後に、少なくとも58m2/gのBET比表面積
を示すこと;
ならびに1100℃の温度で4時間か焼後の前記混合酸化物に関する水銀ポロシメトリーによって得られる導関数曲線(dV/dlogD)が、200nm以下の直径の細孔の範囲において、最大値が、24〜34nmの、Dp,1100℃/4hと表示される細孔径に相当するピークを示すことを特徴とし、VおよびDがそれぞれ、細孔容積および細孔径を意味し、
0.60以上である比R:
(式中:
V 1 は、nm単位での直径が(D p,1100℃/4h −15)〜(D p,1100℃/4h +15)である細孔によって成長させられた細孔容積であり;
V 2 は、直径が200nm以下である細孔によって成長させられた細孔容積であり;
V 1 およびV 2 は、1100℃で4hか焼後の前記混合酸化物に関する水銀ポロシメトリーによって測定される)
によって定義される、混合酸化物。 - ハフニウムをまた含むことを特徴とする、請求項1に記載の混合酸化物。
- 前記混合酸化物中のハフニウムの重量割合が、前記混合酸化物の総重量に対して酸化物当量として表される、2.5%以下、実に2.0%であることを特徴とする、請求項1又は2のいずれか一項に記載の混合酸化物。
- 元素Ce、La、REM、ZrおよびHfが、酸化物、水酸化物またはオキシ水酸化物の形態で、より特に酸化物の形態で存在することを特徴とする、請求項1〜3のいずれか一項に記載の混合酸化物。
- ジルコニウム、セリウム、ランタン、任意選択的にセリウムおよびランタン以外の少なくとも1種の希土類金属(REM)、ならびに任意選択的にハフニウムの酸化物の混合物からなる混合酸化物であって、前記酸化物の重量割合が、次のとおり:
8%〜45%の酸化セリウム;
1%〜10%の酸化ランタン;
0%〜15%の少なくとも1種の希土類金属酸化物(前記希土類金属は、セリウムおよびランタン以外のものである);
0%〜2.5%の酸化ハフニウム;
酸化ジルコニウムとしての残り
であり、
前記混合酸化物が、
1100℃の温度で4時間のか焼後に、少なくとも30m2/gのBET比表面積;
1000℃の温度で4時間のか焼後に、少なくとも58m2/gのBET比表面積
を示すこと;
ならびに、1100℃の温度で4時間か焼後の前記混合酸化物に関する水銀ポロシメトリーによって得られる導関数曲線(dV/dlogD)が、200nm以下の直径の細孔の範囲において、最大値が、24〜34nmの細孔径Dp,1100℃/4hに相当するピークを示すことを特徴とし、VおよびDがそれぞれ、細孔容積および細孔径を意味し、
0.60以上である比R:
(式中:
V 1 は、nm単位での直径が(D p,1100℃/4h −15)〜(D p,1100℃/4h +15)である細孔によって成長させられた細孔容積であり;
V 2 は、直径が200nm以下である細孔によって成長させられた細孔容積であり;
V 1 およびV 2 は、1100℃で4hか焼後の前記混合酸化物に関する水銀ポロシメトリーによって測定される)
によって定義される、混合酸化物。 - 次の元素:
ジルコニウムおよび任意選択的にハフニウム、セリウム、ランタン、イットリウム;または
ジルコニウムおよび任意選択的にハフニウム、セリウム、ランタン、イットリウム、ネオジム;または
ジルコニウムおよび任意選択的にハフニウム、セリウム、ランタン、イットリウム、プラセオジム;または
ジルコニウムおよび任意選択的にハフニウム、セリウム、ランタン
からなる、請求項1〜5のいずれか一項に記載の混合酸化物。 - 前記混合酸化物の総重量に対して、酸化物当量としての、重量割合で厳密には1.0%未満、実に0.01%未満の、酸化物形態SnO2でのスズを含む、請求項1〜6のいずれか一項に記載の混合酸化物。
- 酸化物当量としてのジルコニウムの重量割合が、酸素を別にして、前記混合酸化物の他の構成元素のそれぞれの酸化物当量としての重量割合よりも大きいことを特徴とする、請求項1〜7のいずれか一項に記載の混合酸化物。
- 酸化物当量として表される、前記ジルコニウムの重量割合が、40%〜91%であってもよいことを特徴とする、請求項1〜7のいずれか一項に記載の混合酸化物。
- セリウムおよびランタン以外の前記希土類金属が、イットリウム、ネオジムまたはプラセオジムから選択されることを特徴とする、請求項1〜9のいずれか一項に記載の混合酸化物。
- セリウムおよびランタン以外の希土類金属を含まない、請求項1〜9のいずれか一項に記載の混合酸化物。
- セリウムおよびランタン以外の希土類金属としてイットリウムのみを含む、請求項1〜9のいずれか一項に記載の混合酸化物。
- イットリウムおよびネオジムあるいはイットリウムおよびプラセオジムであってもよい、セリウムおよびランタン以外の2種のみの希土類金属を含む、請求項1〜9のいずれか一項に記載の混合酸化物。
- 前記細孔径Dp,1100℃/4hが24nm〜30nmであり、この上限値は含まないことを特徴とする、請求項1〜13のいずれか一項に記載の混合酸化物。
- 900℃の温度で4時間か焼後の前記混合酸化物に関する水銀ポロシメトリーによって得られる導関数曲線(dV/dlogD)が、200nm以下の直径の細孔の範囲において、最大値が細孔径Dp,900℃/4hに相当し、絶対値の差Dp,1100℃/4h−Dp,900℃/4hが15nm以下、実に10nm以下であるピークを示すことを特徴とする、請求項1〜14のいずれか一項に記載の混合酸化物。
- 900℃の温度で4時間か焼後に、少なくとも60m2/gのBET比表面積を示す、請求項1〜15のいずれか一項に記載の混合酸化物。
- 粉体の形態で提供され、レーザー回折によって測定される平均径d50が、容積分布にわたって、0.5〜50.0μmである、請求項1〜16のいずれか一項に記載の混合酸化物。
- 900℃の温度で4時間か焼後の前記混合酸化物に関する水銀ポロシメトリーによって得られる、前記導関数曲線(dV/dlogD)が、2つの異なるピークを示さないことを特徴とする、請求項1〜17のいずれか一項に記載の混合酸化物。
- 少なくとも1種の無機物質との混合物として請求項1〜18のいずれか一項に記載の混合酸化物を含む組成物。
- 前記無機物質が、アルミナ、酸化チタン、酸化セリウム、酸化ジルコニウム、シリカ、スピネル、ゼオライト、シリケート、結晶性シリコアルミニウムホスフェートまたは結晶性リン酸アルミニウムから選択される、請求項19に記載の組成物。
- 請求項1〜18のいずれか一項に記載の混合酸化物からまたは請求項19もしくは20に記載の組成物から調製される、固体支持体の表面に堆積した、触媒活性コーティング層。
- 請求項21に記載のコーティング層を含む、自動車排ガスを処理するための触媒コンバーター。
- 請求項1〜18のいずれか一項に記載の混合酸化物のまたは請求項19もしくは20に記載の組成物の、触媒コンバーターの調製での使用。
- 請求項21に記載のコーティング層を含む触媒コンバーターが使用されることを特徴とする、内燃エンジンからの排ガスの処理方法。
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PCT/FR2017/050984 WO2017187085A1 (fr) | 2016-04-26 | 2017-04-25 | Oxyde mixte a base de cérium et de zirconium |
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CA3128970A1 (en) * | 2019-03-03 | 2020-09-10 | Rhodia Operations | Mixed oxide with high pore volume |
WO2021012107A1 (en) * | 2019-07-19 | 2021-01-28 | Rhodia Operations | Mixed oxide based on cerium and zirconium |
WO2021161108A1 (en) * | 2020-02-14 | 2021-08-19 | Neo Performance Materials (Singapore) Pte. Ltd. | Process for making cerium and zirconium containing compositions using mesitylene and composition made by same |
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ZA201807143B (en) | 2020-12-23 |
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KR20180137533A (ko) | 2018-12-27 |
CA3022375A1 (fr) | 2017-11-02 |
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MX2018013011A (es) | 2019-01-31 |
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US20190168188A1 (en) | 2019-06-06 |
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CN109071260A (zh) | 2018-12-21 |
US11547982B2 (en) | 2023-01-10 |
BR112018071988A2 (pt) | 2019-02-12 |
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