Reformer assisted lean NO.sub.x catalyst aftertreatment system and method
- Media, PA
- Peoria, IL
- Havana, IL
A method and apparatus for catalytically processing a gas stream passing therethrough to reduce the presence of NO.sub.x therein, wherein the apparatus includes a first catalyst composed of a silver-containing alumina that is adapted for catalytically processing the gas stream at a first temperature range, a second catalyst composed of a copper-containing zeolite located downstream from the first catalyst, wherein the second catalyst is adapted for catalytically processing the gas stream at a lower second temperature range relative to the first temperature range, a hydrocarbon compound for injection into the gas stream upstream of the first catalyst to provide a reductant, and a reformer for reforming a portion of the hydrocarbon compound into H.sub.2 and/or oxygenated hydrocarbon for injection into the gas stream upstream of the first catalyst. The second catalyst is adapted to facilitate the reaction of reducing NOx into N.sub.2, whereby the intermediates are produced via the first catalyst reacting with NOx and hydrocarbons.
- Research Organization:
- Caterpillar Inc., Deerfield, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- Assignee:
- ExxonMobil Research And Engineering Co. (Annandale, NJ)
- Patent Number(s):
- 7,743,602
- Application Number:
- 11/514,544
- OSTI ID:
- 993143
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalytic process for control of NO.sub.x emissions using hydrogen
Method and apparatus to selectively reduce NO.sub.x in an exhaust gas feedstream