Exhaust gas purifying catalyst
US6623716B2 · kind B2 · utility
6Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2001 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Apr 23, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust gas purifying catalyst for purifying exhaust gas discharged from an automotive internal combustion engine. The exhaust gas purifying catalyst comprises at least one noble metal selected from the group consisting of platinum, palladium and rhodium; and boehmite alumina serving as a base material. In this exhaust gas purifying catalyst, nitrogen oxides in exhaust gas from the engine is trapped to the exhaust gas purifying catalyst when exhaust gas is in a lean region and is reduced into nitrogen by the exhaust gas purifying catalyst when exhaust gas is in a stoichiometric region or a rich region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.