Catalyst for clarifying exhaust gas
US7205257B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 3, 2003 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Jul 3, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/525
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
To provide an exhaust gas purifying catalyst which can maintain the catalytic activity at a high level over a long time and can achieve satisfactory emission control performance, an exhaust gas purifying catalyst is prepared so as to contain a noble metal, a perovskite-type composite oxide represented by the following general formula (3), and theta-alumina and/or alpha-alumina:AB1-mNmO3 (3)wherein A represents at least one element selected from rare-earth elements and alkaline earth metals; B represents at least one element selected from Al and transition elements excluding rare-earth elements and noble metals; N represents a noble metal; and m represents an atomic ratio of N satisfying the following relation: 0<m<0.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.