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Exhaust gas purifying catalyst
US9833771B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9833771-B2 |
| Application number | US-201415037078-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 11, 2014 |
| Priority date | Nov 28, 2013 |
| Publication date | Dec 5, 2017 |
| Grant date | Dec 5, 2017 |
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- Title
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Abstract
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The exhaust gas purifying catalyst presented here includes a substrate and a catalyst coat layer formed on the surface of the substrate. The catalyst coat layer is formed in a laminate structure having two layers, with a first layer being nearer to the surface of the substrate and a second layer being relatively further from this surface. The second layer includes a carrier and a noble metal supported on the carrier. The first layer is a noble metal-free layer that does not contain a noble metal but does contain an OSC material having oxygen storage capacity.
First claim
Opening claim text (preview).
The invention claimed is: 1. An exhaust gas purifying catalyst which is disposed in an exhaust passage of an internal combustion engine and eliminates NOx contained in exhaust gas, the exhaust gas purifying catalyst comprising: a substrate; and a catalyst coat layer formed on a surface of the substrate, wherein the catalyst coat layer consists of a first layer formed on the surface of the substrate and a second layer formed on the surface of the first layer, the second layer includes a carrier and a noble metal supported on the carrier, and the first layer is a noble metal-free layer that does not contain a noble metal but does contain an OSC material having oxygen storage capacity, wherein the second layer comprises Rh and Pt, and the mass ratio of Rh and Pt (Rh/Pt) contained in the second layer is between 1/1 and 4/1. 2. The exhaust gas purifying catalyst according to claim 1 , wherein an average thickness of the noble metal-free layer is 10 to 50 μm. 3. The exhaust gas purifying catalyst according to claim 1 , wherein the noble metal-free layer includes a ceria-zirconia complex oxide as the OSC material. 4. The exhaust gas purifying catalyst according to claim 1 , wherein the layer containing the noble metal includes alumina as the carrier. 5. The exhaust gas purifying catalyst according to claim 1 , wherein the layer containing the noble metal includes an OSC material having oxygen storage capacity as the carrier. 6. The exhaust gas purifying catalyst according to claim 1 , wherein the OSC material contained in the noble metal-free layer comprises an OSC material having a pyrochlore structure.
Assignees
Inventors
Classifications
Honeycombs · CPC title
Operations & Transport · mapped topic
Linear dimensions · CPC title
- B01J23/63Primary
with rare earths or actinides · CPC title
O2-storage component incorporated in the catalyst · CPC title
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- What does patent US9833771B2 cover?
- The exhaust gas purifying catalyst presented here includes a substrate and a catalyst coat layer formed on the surface of the substrate. The catalyst coat layer is formed in a laminate structure having two layers, with a first layer being nearer to the surface of the substrate and a second layer being relatively further from this surface. The second layer includes a carrier and a noble metal su…
- Who is the assignee on this patent?
- Cataler Corp
- What technology area does this patent fall under?
- Primary CPC classification B01J23/63. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Dec 05 2017 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).