Base Metal Activated Rhodium Coatings for Catalysts in Three-Way Catalyst (TWC) Applications
US-2015352533-A1 · Dec 10, 2015 · US
Exhaust gas control catalyst
US9937487B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9937487-B2 |
| Application number | US-201415035659-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 6, 2014 |
| Priority date | Nov 14, 2013 |
| Publication date | Apr 10, 2018 |
| Grant date | Apr 10, 2018 |
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Abstract
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Provided is an exhaust gas control catalyst including: a substrate ( 21 ); and a catalyst layer ( 22 ) that is arranged on the substrate, in which the catalyst layer ( 22 ) includes a palladium region ( 23 ) that contains palladium, aluminum oxide, ceria-zirconia solid solution, and a composite oxide of lanthanum, iron, and zirconium, and a rhodium region ( 24 ) that is arranged adjacent to the palladium region along a plane direction of the catalyst layer and contains rhodium, aluminum oxide, and ceria-zirconia solid solution.
First claim
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The invention claimed is: 1. An exhaust gas control catalyst comprising: a substrate; and a first catalyst layer that is arranged on the substrate, wherein the first catalyst layer includes: a palladium region that contains palladium, aluminum oxide, ceria-zirconia solid solution, and a LaFeO 3 —La 2 Zr 2 O 7 —ZrO 2 composite oxide, and a rhodium region that is arranged adjacent to the palladium region along a plane direction of the first catalyst layer and contains rhodium, aluminum oxide, and ceria-zirconia solid solution. 2. The exhaust gas control catalyst according to claim 1 , wherein a surface area of the palladium region on an uppermost surface of the first catalyst layer accounts for 20% to 40% of a total surface area of the first catalyst layer. 3. The exhaust gas control catalyst according to claim 1 , further comprising: one or more second catalyst layers that are arranged between the substrate and the first catalyst layer. 4. The exhaust gas control catalyst according to claim 1 , wherein the palladium region and the rhodium region are directly provided on the substrate.
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Classifications
Two layers · CPC title
Iron · CPC title
Zirconium · CPC title
with rare earths or actinides · CPC title
Operations & Transport · mapped topic
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- What does patent US9937487B2 cover?
- Provided is an exhaust gas control catalyst including: a substrate ( 21 ); and a catalyst layer ( 22 ) that is arranged on the substrate, in which the catalyst layer ( 22 ) includes a palladium region ( 23 ) that contains palladium, aluminum oxide, ceria-zirconia solid solution, and a composite oxide of lanthanum, iron, and zirconium, and a rhodium region ( 24 ) that is arranged adjacent to the…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B01J23/894. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Apr 10 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).