Double layered exhaust gas purification catalyst
US8853120B2 · kind B2 · utility
24Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2012 |
| Grant date | Oct 7, 2014 |
| Priority date | — |
| Expiry date | Jan 26, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/52713
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas purification catalyst has a substrate, a lower catalyst layer that is formed on the substrate and contains at least one of Pd and Pt, and an upper catalyst layer that is formed on the lower catalyst layer and contains Rh. A region that does not contain the upper catalyst layer is disposed on the exhaust gas upstream side of this exhaust gas purification catalyst. The lower catalyst layer includes a front-stage lower catalyst layer on the exhaust gas upstream side and a rear-stage lower catalyst layer on the exhaust gas downstream side. The front-stage lower catalyst layer contains an oxygen storage material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.