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Reformer assisted lean NO.sub.x catalyst aftertreatment system and method

United States Patent

7,743,602
June 29, 2010
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
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.
Kalyanaraman; Mohan (Media, PA), Park; Paul W. (Peoria, IL), Ragle; Christie S. (Havana, IL)
ExxonMobil Research And Engineering Co. (Annandale, NJ), Caterpillar Inc. (Peoria, IL)
11/ 514,544
20080053073
September 1, 2006
U.S. GOVERNMENT RIGHTS This Invention was made with government support under the terms of Contract No. DE-AC05-00OR22725 awarded by the Department of Energy. The government may have certain rights in this invention