Exhaust gas purifying catalyst
US7842643B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2007 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | Sep 19, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J37/0248
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas purifying catalyst exhibiting high catalytic performance and restraining an amount of noble metals used is provided. An exhaust gas purifying catalyst has a catalyst substrate and a catalyst coating layer formed on the catalyst substrate. The catalyst coating layer has a layered structure including an inside layer containing (a-1) Pd, (a-2) Pt, and (a-3) an inorganic oxide, and an outside layer containing (b-1) a noble metal and (b-2) an inorganic oxide. A part of (a-3) the inorganic oxide carries Pd and Pt so that a weight ratio Pd/Pt is within a range of 8 to 12, whereas the other part of (a-3) the inorganic oxide carries Pd and Pt so that a weight ratio Pd/Pt is within a range of 4 to 6 or within a range of 18 to 22.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.