JP2005254047A - 排ガス浄化触媒並びに、金属酸化物粒子及びその製造方法 - Google Patents
排ガス浄化触媒並びに、金属酸化物粒子及びその製造方法 Download PDFInfo
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- JP2005254047A JP2005254047A JP2004065556A JP2004065556A JP2005254047A JP 2005254047 A JP2005254047 A JP 2005254047A JP 2004065556 A JP2004065556 A JP 2004065556A JP 2004065556 A JP2004065556 A JP 2004065556A JP 2005254047 A JP2005254047 A JP 2005254047A
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- metal oxide
- ceria
- alumina
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- 239000002245 particle Substances 0.000 title claims abstract description 80
- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 73
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 73
- 239000003054 catalyst Substances 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 84
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 64
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 41
- 239000002344 surface layer Substances 0.000 claims abstract description 13
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 48
- 238000000746 purification Methods 0.000 claims description 16
- 229910052697 platinum Inorganic materials 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 230000004931 aggregating effect Effects 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 28
- 239000000243 solution Substances 0.000 description 16
- 239000002994 raw material Substances 0.000 description 15
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 11
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 9
- 239000002253 acid Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000004215 Carbon black (E152) Substances 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 239000008188 pellet Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 239000002612 dispersion medium Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000010948 rhodium Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 2
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- IVORCBKUUYGUOL-UHFFFAOYSA-N 1-ethynyl-2,4-dimethoxybenzene Chemical compound COC1=CC=C(C#C)C(OC)=C1 IVORCBKUUYGUOL-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 125000005595 acetylacetonate group Chemical group 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- 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
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
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- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
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- 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
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0211—Impregnation using a colloidal suspension
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- 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
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0244—Coatings comprising several layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/396—Distribution of the active metal ingredient
- B01J35/397—Egg shell like
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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
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- Exhaust Gas After Treatment (AREA)
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Abstract
【解決手段】 セリアのモル数よりもアルミナ及びシリカのモル数の合計が多い中心部(1)と、アルミナ及びシリカのモル数の合計よりもセリアのモル数が多い表面層(2)とを有する金属酸化物粒子、この金属酸化物粒子及びこの金属酸化物粒子に担持された貴金属を含む排ガス浄化触媒、並びにこの金属酸化物粒子の製造方法とする。
【選択図】 図1
Description
CeO2を15重量%含むセリアゾルと、Al2O3を10重量%含むアルミナゾルを、CeとAlとのモル数の比が1:1になるようにして混合して原料ゾルを得た。ここでは、アルミナゾルの等電点が約4.2、セリアゾルの等電点が約7.7であった。
アルミナゾルの代わりに、SiO2を10重量%含むシリカゾルを用いた以外は実施例1と同様にして、CeO2の表面層とSiO2の中心部を有し、これらの酸化物の重量に対して2重量%のPtを担持された触媒(「Pt(2重量%)/CeO2表面SiO2触媒」とする)を得た。尚、シリカゾルの等電点は約2.9であった。この触媒を、実施例1と同様に1mm角のペレットにして試験で用いた。
実施例1で用いたセリアゾルを120℃で24時間にわたって乾燥し、得られた生成物を700℃で5時間焼成してCeO2を得た。その後、実施例1と同様の方法を用いて、Ptを2重量%担持したCeO2触媒(「Pt(2重量%)/CeO2触媒」とする)を得た。この触媒を、実施例1と同様に1mm角のペレットにして試験で用いた。
実施例1で用いたアルミナゾルを120℃で24時間にわたって乾燥し、得られた生成物を700℃で5時間焼成してAl2O3を得た。その後、実施例1と同様の方法を用いて、Ptを2重量%担持したAl2O3触媒(「Pt(2重量%)/Al2O3触媒」とする)を得た。この触媒を、実施例1と同様に1mm角のペレットにして試験で用いた。
比較例1及び2で得たCeO2とAl2O3とを、CeとAlとのモル数の比が1:1になるようにして混合した。その後、実施例1と同様の方法を用いて、Ptを2重量%担持したCeO2とAl2O3との混合触媒(「Pt(2重量%)/CeO2+Al2O3触媒」とする)を得た。この触媒を、実施例1と同様に1mm角のペレットにして試験で用いた。
アルミナゾルの代わりに、ZrO2を10重量%含むジルコニアゾルを用いた以外は実施例1と同様にして、CeO2の表面層とZrO2の中心部を有し、これらの酸化物の重量に対して2重量%のPtを担持された触媒(「Pt(2重量%)/CeO2表面ZrO2触媒」とする)を得た。この触媒を、実施例1と同様に1mm角のペレットにして試験で用いた。
2…セリアに富む表面層
Claims (6)
- アルミナ及びシリカの少なくとも一方とセリアとを含有する金属酸化物粒子、及び
前記金属酸化物粒子に担持された貴金属、
を含み、且つ前記金属酸化物粒子が、セリアのモル数よりもアルミナ及びシリカのモル数の合計が多い中心部と、アルミナ及びシリカのモル数の合計よりもセリアのモル数が多い表面層とを有する、排ガス浄化触媒。 - 前記金属酸化物粒子が、アルミナ及びシリカの少なくとも一方のゾルとセリアゾルとを含有する溶液から形成される、請求項1に記載の排ガス浄化触媒。
- 前記金属酸化物粒子が500nm以下の粒子径を有する、請求項1又は2に記載の排ガス浄化触媒。
- 前記貴金属が白金である、請求項1〜3のいずれかに記載の排ガス浄化触媒。
- セリアのモル数よりもアルミナ及びシリカのモル数の合計が多い中心部と、アルミナ及びシリカのモル数の合計よりもセリアのモル数が多い表面層とを有する金属酸化物粒子。
- アルミナ及びシリカの少なくとも一方のゾルとセリアゾルとを含有する溶液を調製すること、
前記溶液のpHを、セリアゾルの等電点よりも、アルミナ及びシリカの少なくとも一方のゾルの等電点に近づけること、並びに
前記溶液からゾルを凝集させて凝集物を作ること、
を含む、セリアのモル数よりもアルミナ及びシリカのモル数の合計が多い中心部と、アルミナ及びシリカのモル数の合計よりもセリアのモル数が多い表面層とを有する金属酸化物粒子の製造方法。
Priority Applications (5)
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JP2004065556A JP4165419B2 (ja) | 2004-03-09 | 2004-03-09 | 金属酸化物粒子及び排ガス浄化触媒の製造方法 |
CNB2005800073143A CN100512952C (zh) | 2004-03-09 | 2005-03-08 | 废气净化催化剂、金属氧化物颗粒及其生产方法 |
PCT/JP2005/004403 WO2005084796A1 (en) | 2004-03-09 | 2005-03-08 | Exhaust gas purifying catalyst, metal oxide particle and production process thereof |
EP05720674A EP1722889A1 (en) | 2004-03-09 | 2005-03-08 | Exhaust gas purifying catalyst, metal oxide particle and production process thereof |
US10/588,603 US7745371B2 (en) | 2004-03-09 | 2005-03-08 | Exhaust gas purifying catalyst, metal oxide particle and production process thereof |
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JP2004065556A JP4165419B2 (ja) | 2004-03-09 | 2004-03-09 | 金属酸化物粒子及び排ガス浄化触媒の製造方法 |
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JP2005254047A true JP2005254047A (ja) | 2005-09-22 |
JP4165419B2 JP4165419B2 (ja) | 2008-10-15 |
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US (1) | US7745371B2 (ja) |
EP (1) | EP1722889A1 (ja) |
JP (1) | JP4165419B2 (ja) |
CN (1) | CN100512952C (ja) |
WO (1) | WO2005084796A1 (ja) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007268460A (ja) * | 2006-03-31 | 2007-10-18 | Toyota Motor Corp | 金属酸化物触媒担体粒子、及び排ガス浄化触媒 |
JP2007313443A (ja) * | 2006-05-26 | 2007-12-06 | Toyota Central Res & Dev Lab Inc | 排ガス浄化装置 |
WO2008010585A1 (fr) * | 2006-07-18 | 2008-01-24 | Toyota Jidosha Kabushiki Kaisha | Procédé de fabrication d'un oxyde métallique composite |
JP2008029932A (ja) * | 2006-07-27 | 2008-02-14 | National Institute Of Advanced Industrial & Technology | 貴金属触媒及びその製造方法 |
US7745371B2 (en) | 2004-03-09 | 2010-06-29 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying catalyst, metal oxide particle and production process thereof |
JP2011125862A (ja) * | 2011-02-02 | 2011-06-30 | Toyota Motor Corp | 排ガス浄化用金属酸化物触媒担体粒子、及び排ガス浄化触媒 |
US7989387B2 (en) | 2004-04-27 | 2011-08-02 | Toyota Jidosha Kabushiki Kaisha | Process for producing metal oxide particle and exhaust gas purifying catalyst |
US8026193B2 (en) | 2004-04-27 | 2011-09-27 | Toyota Jidosha Kabushiki Kaisha | Metal oxide particle, production process thereof and exhaust gas purifying catalyst |
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- 2005-03-08 WO PCT/JP2005/004403 patent/WO2005084796A1/en not_active Application Discontinuation
- 2005-03-08 US US10/588,603 patent/US7745371B2/en not_active Expired - Fee Related
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US7745371B2 (en) | 2004-03-09 | 2010-06-29 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying catalyst, metal oxide particle and production process thereof |
US7989387B2 (en) | 2004-04-27 | 2011-08-02 | Toyota Jidosha Kabushiki Kaisha | Process for producing metal oxide particle and exhaust gas purifying catalyst |
US8026193B2 (en) | 2004-04-27 | 2011-09-27 | Toyota Jidosha Kabushiki Kaisha | Metal oxide particle, production process thereof and exhaust gas purifying catalyst |
US8389435B2 (en) | 2006-03-31 | 2013-03-05 | Toyota Jidosha Kabushiki Kaisha | Metal oxide catalyst carrier particle and exhaust gas purification catalyst |
JP2007268460A (ja) * | 2006-03-31 | 2007-10-18 | Toyota Motor Corp | 金属酸化物触媒担体粒子、及び排ガス浄化触媒 |
JP2007313443A (ja) * | 2006-05-26 | 2007-12-06 | Toyota Central Res & Dev Lab Inc | 排ガス浄化装置 |
JP2008024529A (ja) * | 2006-07-18 | 2008-02-07 | Toyota Motor Corp | 複合金属酸化物の製造方法 |
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US8298983B2 (en) | 2006-07-18 | 2012-10-30 | Toyota Jidosha Kabushiki Kaisha | Production process of composite metal oxide |
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JP2008029932A (ja) * | 2006-07-27 | 2008-02-14 | National Institute Of Advanced Industrial & Technology | 貴金属触媒及びその製造方法 |
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US8293677B2 (en) | 2007-05-23 | 2012-10-23 | Toyota Jidosha Kabushiki Kaisha | Core-shell structure, process for its production, and exhaust gas purification catalyst comprising core-shell structure |
JP2011125862A (ja) * | 2011-02-02 | 2011-06-30 | Toyota Motor Corp | 排ガス浄化用金属酸化物触媒担体粒子、及び排ガス浄化触媒 |
Also Published As
Publication number | Publication date |
---|---|
CN1929913A (zh) | 2007-03-14 |
CN100512952C (zh) | 2009-07-15 |
EP1722889A1 (en) | 2006-11-22 |
US20070179052A1 (en) | 2007-08-02 |
US7745371B2 (en) | 2010-06-29 |
JP4165419B2 (ja) | 2008-10-15 |
WO2005084796A1 (en) | 2005-09-15 |
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