Exhaust gas-purification catalyst having multi-layer structure including precious metal thin layer as top layer, and method for producing same
US-2022203337-A1 · Jun 30, 2022 · US
Exhaust gas purification catalyst
US12390794B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12390794-B2 |
| Application number | US-202318177170-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 2, 2023 |
| Priority date | Mar 15, 2022 |
| Publication date | Aug 19, 2025 |
| Grant date | Aug 19, 2025 |
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Abstract
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Provided is an exhaust gas purification catalyst improved in warm-up performance while suppressing HC poisoning of a noble metal in an atmosphere in which an air-fuel ratio (A/F) is rich and the HC poisoning easily occurs. The present disclosure relates to an exhaust gas purification catalyst that includes a substrate and a catalyst coating layer coated on the substrate. The catalyst coating layer includes a lower coating layer coated on the substrate and an upper coating layer coated on the lower coating layer. The lower coating layer contains a noble metal. The upper coating layer contains Pd and/or Pt. The Pd and/or Pt contained in the upper coating layer is supported on Al 2 O 3 by a certain amount or more. A thickness of the upper coating layer is adjusted.
First claim
Opening claim text (preview).
What is claimed is: 1. An exhaust gas purification catalyst comprising: a substrate; and a catalyst coating layer coated on the substrate, wherein the catalyst coating layer comprises a lower coating layer coated on the substrate and an upper coating layer coated on the lower coating layer, wherein the lower coating layer contains a noble metal, wherein the upper coating layer contains Pd and/or Pt, wherein the Pd and/or Pt contained in the upper coating layer is supported on Al 2 O 3 by 80 weight % or more of a total weight of the Pd and/or Pt contained in the upper coating layer, wherein the content of Al 2 O 3 supporting Pd and/or Pt contained in the upper coating layer is 1.2 g to 18 g relative to the substrate capacity of 1 L, and wherein a ratio of a thickness of the upper coating layer to a thickness of the lower coating layer (upper coating layer/lower coating layer) is 0.2 or less. 2. The exhaust gas purification catalyst according to claim 1 , wherein the Pd and/or Pt contained in the upper coating layer is supported on Al 2 O 3 by 90 weight % or more of the total weight. 3. The exhaust gas purification catalyst according to claim 1 , wherein the Pd and/or Pt contained in the upper coating layer is supported on Al 2 O 3 by 95 weight % or more of the total weight. 4. The exhaust gas purification catalyst according to claim 1 , wherein the thickness of the upper coating layer is 20 μm or less.
Assignees
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Classifications
Platinum · CPC title
Two layers · CPC title
Palladium · CPC title
Processes characterised by a specific catalyst · CPC title
Engine exhaust gases · CPC title
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- What does patent US12390794B2 cover?
- Provided is an exhaust gas purification catalyst improved in warm-up performance while suppressing HC poisoning of a noble metal in an atmosphere in which an air-fuel ratio (A/F) is rich and the HC poisoning easily occurs. The present disclosure relates to an exhaust gas purification catalyst that includes a substrate and a catalyst coating layer coated on the substrate. The catalyst coating la…
- Who is the assignee on this patent?
- Kabashima Nobusuke, Shinozaki Tetsuya, Toyota Motor Co Ltd, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification B01J37/0244. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 19 2025 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).