Catalyst for exhaust gas purification
US-2016288100-A1 · Oct 6, 2016 · US
Exhaust gas purification device
US10618034B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10618034-B2 |
| Application number | US-201716071444-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 19, 2017 |
| Priority date | Jan 21, 2016 |
| Publication date | Apr 14, 2020 |
| Grant date | Apr 14, 2020 |
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Abstract
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An exhaust gas purification device which has improved exhaust gas purification performance. An exhaust gas purification device which includes a first catalyst layer that contains: a Pd-supporting catalyst which is obtained by having alumina carrier particles support Pd; a first Rh-supporting catalyst which is obtained by having first ceria-zirconia carrier particles support Rh; and second ceria-zirconia carrier particles. This exhaust gas purification device is configured such that: the ceria concentration in the first ceria-zirconia carrier particles is 30 wt % or less; and the amount of ceria in the second ceria-zirconia carrier particles is larger than the amount of ceria in the first ceria-zirconia carrier particles.
First claim
Opening claim text (preview).
The invention claimed is: 1. An exhaust gas purification device, comprising: a first catalyst layer comprising: a Pd-supporting catalyst supporting Pd on an alumina carrier particle, a first Rh-supporting catalyst supporting Rh on a first ceria-zirconia carrier particle, and a second ceria-zirconia carrier particle; and a second catalyst layer located under the first catalyst layer comprising: a second Rh-supporting catalyst supporting Rh on the first ceria-zirconia carrier particle, wherein the ceria concentration in the first ceria-zirconia carrier particle is 30% by weight or less and the amount of ceria in the second ceria-zirconia carrier particle is larger than the amount of ceria in the first ceria-zirconia carrier particle, wherein the ratio between the amount of Rh of the first Rh-supporting catalyst and the amount of Rh of the second Rh-supporting catalyst is within the range of 10:90 to 90:10. 2. The exhaust gas purification device according to claim 1 , wherein the ceria concentration in the second ceria-zirconia carrier particle is greater than 30% by weight. 3. The exhaust gas purification device according to claim 1 , wherein the first catalyst layer further comprises barium sulfate. 4. The exhaust gas purification device according to claim 1 , wherein the second catalyst layer comprises barium sulfate. 5. The exhaust gas purification device according to claim 1 , further comprising one or more layers located under the second catalyst layer. 6. The exhaust gas purification device according to claim 1 , wherein the first catalyst layer is present on a substrate. 7. The exhaust gas purification device according to claim 1 , having the second catalyst layer between the first catalyst layer and a substrate. 8. The exhaust gas purification device according to claim 5 , having the one or more layers between the second catalyst layer and a substrate.
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Classifications
Zr-Ce mixed oxides · CPC title
- B01D53/945Primary
characterised by a specific catalyst · CPC title
Yttrium · CPC title
Palladium · CPC title
Neodymium · CPC title
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- What does patent US10618034B2 cover?
- An exhaust gas purification device which has improved exhaust gas purification performance. An exhaust gas purification device which includes a first catalyst layer that contains: a Pd-supporting catalyst which is obtained by having alumina carrier particles support Pd; a first Rh-supporting catalyst which is obtained by having first ceria-zirconia carrier particles support Rh; and second ceria…
- Who is the assignee on this patent?
- Cataler Corp
- What technology area does this patent fall under?
- Primary CPC classification B01D53/945. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Apr 14 2020 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).