Cerium-zirconium-based composite oxide and method for producing same
US-2017072386-A1 · Mar 16, 2017 · US
Catalyst for purifying exhaust gas
US10058846B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10058846-B2 |
| Application number | US-201715663952-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 31, 2017 |
| Priority date | Sep 5, 2016 |
| Publication date | Aug 28, 2018 |
| Grant date | Aug 28, 2018 |
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Abstract
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An catalyst for purifying exhaust gas comprising an OCS material that has sufficient heat resistance and achieves a favorable balance between the oxygen storage volume and the oxygen absorption/release rate includes an catalyst for purifying exhaust, which has a substrate and a catalyst coating layer formed on the substrate, wherein the catalyst coating layer comprises a ceria-zirconia-based composite oxide having a pyrochlore structure in an amount of 5 to 100 g/L based on the volume of the substrate, the ceria-zirconia-based composite oxide has a secondary particle size (D50) of 3 μm to 7 μm, and the ceria-zirconia-based composite oxide optionally contains praseodymium.
First claim
Opening claim text (preview).
What is claimed is: 1. A catalyst for purifying exhaust gas, which has a substrate and a catalyst coating layer formed on the substrate, wherein the catalyst coating layer comprises a ceria-zirconia-based composite oxide having a pyrochlore structure in an amount of 5 to 100 g/L based on the volume of the substrate, wherein the ceria-zirconia-based composite oxide is a secondary particle and has a secondary particle size (D50) of 3 μm to 7 μm, and wherein the ceria-zirconia-based composite oxide optionally contains praseodymium. 2. The catalyst according to claim 1 , wherein the catalyst is a start-up catalyst (S/C) or an underfloor catalyst (UF/C) of a catalyst system for purifying exhaust gas including S/C and UF/C that is disposed downstream from the S/C along the flow direction of exhaust gas. 3. The catalyst according to claim 2 , wherein the catalyst is S/C that has at least two catalyst coating layers, and the uppermost catalyst coating layer contains the ceria-zirconia-based composite oxide in an amount of 5 to 50 g/L based on the volume of the substrate. 4. The catalyst according to claim 2 , wherein the catalyst is S/C that has at least two catalyst coating layers, and at least one catalyst coating layer other than the uppermost catalyst coating layer contains the ceria-zirconia-based composite oxide in an amount of 5 to 30 g/L based on the volume of the substrate. 5. The catalyst according to claim 2 , wherein the catalyst is UF/C that has at least two catalyst coating layers, and the uppermost catalyst coating layer contains the ceria-zirconia-based composite oxide in an amount of 5 to 20 g/L based on the volume of the substrate. 6. The catalyst according to claim 1 , wherein the ceria-zirconia-based composite oxide contains praseodymium.
Assignees
Inventors
Classifications
Zr-Ce mixed oxides · CPC title
Two layers · CPC title
Sorbent size or size distribution, e.g. particle size · CPC title
Lanthanum · CPC title
Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] · CPC title
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- What does patent US10058846B2 cover?
- An catalyst for purifying exhaust gas comprising an OCS material that has sufficient heat resistance and achieves a favorable balance between the oxygen storage volume and the oxygen absorption/release rate includes an catalyst for purifying exhaust, which has a substrate and a catalyst coating layer formed on the substrate, wherein the catalyst coating layer comprises a ceria-zirconia-based co…
- Who is the assignee on this patent?
- Saito Yoshinori, Miura Masahide, Nakahigashi Seiji, and 7 more
- What technology area does this patent fall under?
- Primary CPC classification B01J23/10. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 28 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 10 related publications on this page (citations in our corpus or others sharing the same primary CPC).