Exhaust gas control catalyst
US-11426710-B2 · Aug 30, 2022 · US
Exhaust gas purification catalyst
US11719144B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11719144-B2 |
| Application number | US-202017121245-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 14, 2020 |
| Priority date | Dec 26, 2019 |
| Publication date | Aug 8, 2023 |
| Grant date | Aug 8, 2023 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The present disclosure provides an exhaust gas purification catalyst having improved durability, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the downstream portion contains Rh fine particles, and wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation σ of the particle size of 0.8 nm or less.
First claim
Opening claim text (preview).
What is claimed is: 1. An exhaust gas purification catalyst comprising: a substrate; and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion, wherein the downstream portion contains Rh fine particles, and wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation σ of the particle size of 0.8 nm or less. 2. The exhaust gas purification catalyst according to claim 1 , wherein a content of the Rh fine particles in the downstream portion is 0.01 g/L or more to 0.7 g/L or less based on a volume of the substrate. 3. The exhaust gas purification catalyst according to claim 1 , wherein the downstream portion further contains an OSC material that has an oxygen storage capacity, and a weight proportion of the OSC material in the downstream portion is 5% by weight or more to 55% by weight or less. 4. The exhaust gas purification catalyst according to claim 1 , wherein the upstream portion contains Pt as a catalyst metal.
Assignees
Inventors
Classifications
Nanoparticles · CPC title
Metal or metal oxide crystallite size · CPC title
Scanning electron microscopy; Transmission electron microscopy · CPC title
- B01J23/42Primary
Platinum · CPC title
Catalysts containing parts with different compositions · CPC title
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Frequently asked questions
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- What does patent US11719144B2 cover?
- The present disclosure provides an exhaust gas purification catalyst having improved durability, which comprises a substrate and a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure, wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a …
- Who is the assignee on this patent?
- Shimano Norimichi, Shirakawa Shogo, Miura Masahide, and 8 more
- What technology area does this patent fall under?
- Primary CPC classification B01J23/42. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 08 2023 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).