Process for reducing NOx emissions from engine exhaust using LNT and SCR components
US8112987B2 · kind B2 · utility
1Cited by
21References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 29, 2008 |
| Grant date | Feb 14, 2012 |
| Priority date | — |
| Expiry date | May 5, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of reducing NOx in a vehicle exhaust operating by alternating exhaust flow between two lean NOx traps and directing the emerging exhaust to a downstream SCR catalyst system. While exhaust predominantly flows through one of the lean NOx traps, a reductant is provided to the other NOx trap so as to produce ammonia that is also directed to the SCR catalyst system. An exhaust system implementing the method of the invention is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.