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Exhaust gas control catalyst
US11426710B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11426710-B2 |
| Application number | US-202017088767-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 4, 2020 |
| Priority date | Dec 26, 2019 |
| Publication date | Aug 30, 2022 |
| Grant date | Aug 30, 2022 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The present disclosure relates to an exhaust gas control catalyst including a base and a catalyst coating layer having a two-layer structure on the base. The catalyst coating layer includes a lower layer on the base, and an upper layer on the lower layer. The upper layer of the catalyst coating layer contains Rh particles in which a mean particle diameter measured by observation using a transmission electron microscope is 1.0 nm or more and 2.0 nm or less and a particle-diameter standard deviation σ is 0.8 nm or less. A length of the upper layer from an end face on a downstream side in an exhaust gas flow direction falls within a range of 70% or more and 100% or less of a total length of the base.
First claim
Opening claim text (preview).
What is claimed is: 1. An exhaust gas control catalyst comprising a base and a catalyst coating layer having a two-layer structure on the base, wherein the catalyst coating layer includes a lower layer on the base, and an upper layer on the lower layer, the upper layer of the catalyst coating layer contains Rh particles in which a mean particle diameter measured by observation using a transmission electron microscope is 1.0 nm or more and 2.0 nm or less and a particle-diameter standard deviation σ is 0.8 nm or less, and a length of the upper layer from an end face on a downstream side in an exhaust gas flow direction falls within a range of 70% or more and 100% or less of a total length of the base. 2. The exhaust gas control catalyst according to claim 1 , wherein a length of the lower layer of the catalyst coating layer from an end face on an upstream side in the exhaust gas flow direction falls within a range of 40% or more and 100% or less of the total length of the base. 3. The exhaust gas control catalyst according to claim 1 , wherein the lower layer of the catalyst coating layer contains Pt as a catalyst metal.
Assignees
Inventors
Classifications
- B01J23/464Primary
Rhodium · CPC title
Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title
Palladium · CPC title
Platinum · CPC title
with rare earths or actinides · CPC title
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Frequently asked questions
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- What does patent US11426710B2 cover?
- The present disclosure relates to an exhaust gas control catalyst including a base and a catalyst coating layer having a two-layer structure on the base. The catalyst coating layer includes a lower layer on the base, and an upper layer on the lower layer. The upper layer of the catalyst coating layer contains Rh particles in which a mean particle diameter measured by observation using a transmi…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd, Cataler Corp
- What technology area does this patent fall under?
- Primary CPC classification B01J23/464. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 30 2022 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).