Platinum, rhodium, and palladium catalyst for automotive emission control
US4153579A · kind A · utility
37Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1978 |
| Grant date | May 8, 1979 |
| Priority date | — |
| Expiry date | Feb 6, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A three-way layered catalyst for use in a stoichiometric air/fuel ratio system comprising an alumina support having deposited thereon the catalyst materials platinum, palladium and rhodium and having a first layer of platinum positioned at the support surface, a second layer of catalyst material selected from the group consisting of rhodium and a mixture of palladium and rhodium adjacent to and radially inward of the first layer with palladium inward of and adjacent to said second layer where the catalyst material of such layer is rhodium. Cerium oxide may be added to the support for improved performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.