Nox trap with improved performance
US5750082A · kind A · utility
30Cited by
14References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1995 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Sep 21, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2255/91
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention is a nitrogen oxide trap separate catalyst phases. One of the phases is platinum on a porous support and another is alkali metal or elements and alkaline earth elements on another porous support. The phases may be provided as an intimate mixture or as layers in the trap. The trap may be used in an internal combustion engine exhaust gas catalyst system. During lean-burn operation of the engine the trap adsorbs nitrogen oxides and releases the nitrogen oxides during decreased oxygen concentration in the exhaust gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.