Catalyzed SCR filter and emission treatment system
US7229597B2 · kind B2 · utility
130Cited by
33References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2003 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Feb 2, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49345
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Provided is an emission treatment system and method for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The emission treatment system has an oxidation catalyst upstream of a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia. Also provided is a method for disposing an SCR catalyst composition on a wall flow monolith that provides adequate catalyst loading, but does not result in unsuitable back pressures in the exhaust.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.