Exhaust gas-purifying catalyst and process for preparation thereof
US5147842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Feb 11, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to a purifying-catalyst for exhaust gas emitted from internal combustion engines such as automobiles, and the object is to provide a catalyst which exhibits excellent exhaust gas purification performance at lower temperature compared to usual catalysts, even after high temperature aging, and a process for preparation thereof. This object has been attained by an exhaust gas-purifying catalyst which has a structure to have at least two catalyst component-containing layers on a support having a monolithic structure, and wherein, as the catalyst components, the inner catalyst component-containing layer contains at least one element of the platinum group, activated alumina and cerium oxide, the outer catalyst component-containing layer contains at least one element of the platinum group, activated alumina and optionally a zirconium compound, and at least one of the inner catalyst component-containing layer and the outer catalyst component-containing layer further contains a coprecipitated ceria-stabilized zirconia.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.