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Exhaust emission control catalyst
US8940657B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8940657-B2 |
| Application number | US-201214128394-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 31, 2012 |
| Priority date | Jun 24, 2011 |
| Publication date | Jan 27, 2015 |
| Grant date | Jan 27, 2015 |
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Abstract
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An exhaust emission control catalyst disclosed herein is equipped with a rhodium catalytic layer and a platinum catalytic layer, and is characterized in that a relationship between a mole average (X) of a Pauling's electronegativity that is calculated as to elements included in the rhodium catalytic layer except platinum group elements and oxygen and a mole average (Y) of a Pauling's electronegativity that is calculated as to elements included in the platinum catalytic layer except platinum group elements and oxygen is 1.30≦X≦1.45 and 1.47≦Y≦2.0. According to this exhaust emission control catalyst, an interlayer transfer of platinum and/or rhodium and the alloying of platinum and/or rhodium are suppressed during use of the catalyst, and high exhaust gas purification performance can be exerted.
First claim
Opening claim text (preview).
The invention claimed is: 1. An exhaust emission control catalyst comprising: a substrate; and a catalytic layer that is formed on a surface of the substrate, wherein the catalytic layer comprises a rhodium catalytic layer, which includes a first carrier and rhodium supported on the first carrier, and a platinum catalytic layer, which includes a second carrier and platinum supported on the second carrier, the first carrier in the rhodium catalytic layer includes CeO 2 , ZrO…
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Operations & Transport · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
Operations & Transport · mapped topic
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Frequently asked questions
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- What does patent US8940657B2 cover?
- An exhaust emission control catalyst disclosed herein is equipped with a rhodium catalytic layer and a platinum catalytic layer, and is characterized in that a relationship between a mole average (X) of a Pauling's electronegativity that is calculated as to elements included in the rhodium catalytic layer except platinum group elements and oxygen and a mole average (Y) of a Pauling's electroneg…
- Who is the assignee on this patent?
- Segawa Yoshihide, Toyota Motor Co Ltd
- 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 Jan 27 2015 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).