Exhaust gas-purifying catalyst excellent in heat resistance and process for preparation thereof
US5200384A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1991 |
| Grant date | Apr 6, 1993 |
| 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 containing on a support having a monolithic structure as catalytic components at least one element of the platinum group, activated alumina, cerium, a coprecipitated ceria-stabilized zirconia oxide and optionally a zirconium compound, and a process for preparation of the above exhaust gas-purifying catalyst which comprises PA0 (a) preparing activated alumina containing at least one element of the platinum group, PA0 (b) preparing a slurry containing this prepared platinum group element-containing activated alumina, cerium oxide, the coprecipitated ceria-stabilized zirconia and optionally the zirconium compound, and PA0 (c) coating the slurry onto the support having a monolithic structure and calcining it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.