PGM nanoparticles TWC catalysts for gasoline exhaust gas applications
US-10875010-B2 · Dec 29, 2020 · US
Exhaust gas purification catalyst
US11400436B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11400436-B2 |
| Application number | US-202017107224-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 30, 2020 |
| Priority date | Dec 26, 2019 |
| Publication date | Aug 2, 2022 |
| Grant date | Aug 2, 2022 |
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Abstract
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The present disclosure provides an exhaust gas purification catalyst having an improved low-temperature activity, which comprises a substrate and a catalyst coat layer formed on the substrate, wherein the catalyst coat layer contains Rh fine particles and a promoter comprising a Ce—Zr-based composite oxide and a Zr-based composite oxide not containing cerium oxide, 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, and wherein the Rh fine particles are supported on each of the Ce—Zr-based composite oxide and the Zr-based composite oxide not containing cerium oxide.
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, wherein the catalyst coat layer contains Rh fine particles and a promoter comprising a Ce—Zr-based composite oxide and a Zr-based composite oxide not containing cerium oxide, 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, and wherein the Rh fine particles are supported on each of the Ce—Zr-based composite oxide and the Zr-based composite oxide not containing cerium oxide.
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Classifications
Improving ICE efficiencies · CPC title
Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters · CPC title
Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths · CPC title
Metal or metal oxide crystallite size · CPC title
Nanoparticles · CPC title
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- What does patent US11400436B2 cover?
- The present disclosure provides an exhaust gas purification catalyst having an improved low-temperature activity, which comprises a substrate and a catalyst coat layer formed on the substrate, wherein the catalyst coat layer contains Rh fine particles and a promoter comprising a Ce—Zr-based composite oxide and a Zr-based composite oxide not containing cerium oxide, wherein the Rh fine particles…
- Who is the assignee on this patent?
- Chinzei Isao, Nakahigashi Seiji, Shirakawa Shogo, and 12 more
- 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 Aug 02 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).