Exhaust emission control catalyst
US6559086B1 · kind B1 · utility
4Cited by
9References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2000 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Mar 2, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust-gas-purifying catalyst wherein a first zeolite loaded with a catalyst metal and a second zeolite unloaded with a catalyst metal are mixed. By actively adsorbing HC onto the second zeolite, it is possible to inhibit the catalyst metal loaded on the first zeolite from being poisoned by HC, and to sufficiently adsorb HC. Accordingly, since the HC adsorbing capability is improved, and since the HC poisoning of the catalyst metal is suppressed, the NOx purifying capability is enhanced and the durability is also upgraded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.