Catalytic converter
US-9873085-B2 · Jan 23, 2018 · US
Exhaust gas purification catalyst
US11801492B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11801492-B2 |
| Application number | US-202217809754-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 29, 2022 |
| Priority date | Jul 6, 2021 |
| Publication date | Oct 31, 2023 |
| Grant date | Oct 31, 2023 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
The present disclosure provides an exhaust gas purification catalyst improved in OSC performance while maintaining an exhaust gas purification performance, which comprises a substrate and at least one catalyst layer formed on the substrate, wherein an uppermost catalyst layer contains a catalyst metal, a first OSC material having a pyrochlore structure, and a second OSC material having a higher oxygen storage/release rate than the first OSC material, wherein the uppermost catalyst layer consists of an upstream catalyst layer and a downstream catalyst layer, and wherein a proportion of a mass of the second OSC material based on a total mass of the first OSC material and the second OSC material is in a specific range in each of the upstream catalyst layer and the downstream catalyst layer.
First claim
Opening claim text (preview).
What is claimed is: 1. An exhaust gas purification catalyst comprising: a substrate; and a catalyst layer which is formed on the substrate and consists of one layer, wherein the catalyst layer contains a catalyst metal, a first OSC material having a pyrochlore structure, and a second OSC material having a higher oxygen storage/release rate than the first OSC material, and wherein the catalyst layer consists of an upstream catalyst layer formed in an upstream side in a flow direction of an exhaust gas, and a downstream catalyst layer formed in a downstream side in the flow direction of the exhaust gas, wherein a proportion of a mass of the second OSC material based on a total mass of the first OSC material and the second OSC material is from 0.55 to 0.73 in the upstream catalyst layer, wherein a proportion of a mass of the second OSC material based on a total mass of the first OSC material and the second OSC material is from 0.27 to 0.55 in the downstream catalyst layer, and wherein the catalyst metal is Rh. 2. The exhaust gas purification catalyst according to claim 1 , wherein the first OSC material and the second OSC material are ceria-zirconia based composite oxides. 3. The exhaust gas purification catalyst according to claim 1 , wherein the upstream catalyst layer is formed in a range of from 40% to 80% of an entire length of the substrate from an end portion in the upstream side, and the downstream catalyst layer is formed in a range of from 40% to 80% of the entire length of the substrate from an end portion in the downstream side.
Assignees
Inventors
Classifications
- B01J23/464Primary
Rhodium · CPC title
in different layers · CPC title
in different zones · CPC title
Alumina · CPC title
of rare earths · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11801492B2 cover?
- The present disclosure provides an exhaust gas purification catalyst improved in OSC performance while maintaining an exhaust gas purification performance, which comprises a substrate and at least one catalyst layer formed on the substrate, wherein an uppermost catalyst layer contains a catalyst metal, a first OSC material having a pyrochlore structure, and a second OSC material having a higher…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- 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 Oct 31 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 12 related publications on this page (citations in our corpus or others sharing the same primary CPC).