Catalyst system for generating carbon monoxide for use with automotive catalysts
US7160832B2 · kind B2 · utility
2Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2003 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Dec 27, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A50/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a catalyst system that may be used to regenerate NOx adsorber catalysts. It also provides methods for using these catalysts. According to the present invention, hydrocarbons are introduced into an exhaust gas stream upstream of a metal ion exchanged zeolite catalyst to generate CO. The metal ion exchanged zeolite catalyst is preferably a Cu-ZSM-5 catalyst that has a high loading of copper. The hydrocarbons are oxidized to carbon monoxide, and the carbon monoxide is then exposed to a NOx adsorber catalyst, which facilitates regeneration of that catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.