Abstract: A method and apparatus for catalytically processing a gas stream passing therethrough to reduce the presence of NOx 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 H2 and/or oxygenated hydrocarbon for injection into the gas stream upstream of the first catalyst.
Type:
Grant
Filed:
September 1, 2006
Date of Patent:
June 29, 2010
Assignees:
ExxonMobil Research And Engineering Co., Caterpillar Inc.
Inventors:
Mohan Kalyanaraman, Paul W. Park, Christie S. Ragle