Method and apparatus to selectively reduce NOx in an exhaust gas feedstream
US8006481B2 · kind B2 · utility
6Cited by
15References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2006 |
| Grant date | Aug 30, 2011 |
| Priority date | — |
| Expiry date | Jun 28, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method and apparatus are described to selectively reduce NOx emissions of an internal combustion engine. An exhaust aftertreatment system includes an injection device operative to dispense a hydrocarbon reductant upstream of a silver-alumina catalytic reactor device. A control system determines a NOx concentration and hydrocarbon/NOx ratio based upon selected parameters of the exhaust gas feedstream and dispenses hydrocarbon reductant during lean engine operation. Included is a method to control elements of the feedstream during lean operation. The hydrocarbon reductant may include engine fuel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.