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Method and system for the combination of non-thermal plasma and metal/metal oxide doped .gamma.-alumina catalysts for diesel engine exhaust aftertreatment system

United States Patent

July 25, 2006
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
The present disclosure pertains to a system and method for treatment of oxygen rich exhaust and more specifically to a method and system that combines non-thermal plasma with a metal doped .gamma.-alumina catalyst. Current catalyst systems for the treatment of oxygen rich exhaust are capable of achieving only approximately 7 to 12% NO.sub.x reduction as a passive system and only 25 40% reduction when a supplemental hydrocarbon reductant is injected into the exhaust stream. It has been found that treatment of an oxygen rich exhaust initially with a non-thermal plasma and followed by subsequent treatment with a metal doped .gamma.-alumina prepared by the sol gel method is capable of increasing the NO.sub.x reduction to a level of approximately 90% in the absence of SO.sub.2 and 80% in the presence of 20 ppm of SO.sub.2. Especially useful metals have been found to be indium, gallium, and tin.
Aardahl; Christopher L. (Richland, WA), Balmer-Miller; Mari Lou (West Richland, WA), Chanda; Ashok (Peoria, IL), Habeger; Craig F. (West Richland, WA), Koshkarian; Kent A. (Peoria, IL), Park; Paul W. (Peoria, IL)
Caterpillar Inc. (Peoria, IL), Battelle Memorial Institute (Richland, WA)
09/ 708,863
November 8, 2000
This invention was made with Government support under DOE Contract No. DE-AC06-76RLO 1830 awarded by the U.S. Department of Energy. The Government has certain rights to this invention.