Inventors:
Christopher L. Aardahl - Richland WA, US
Ashok Chanda - Peoria IL, US
Craig F. Habeger - West Richland WA, US
Kent A. Koshkarian - Peoria IL, US
Paul W. Park - Peoria IL, US
Assignee:
Caterpillar Inc. - Peoria IL
Battelle Memorial Institute - Richland WA
International Classification:
B01D 50/00
F01N 3/10
US Classification:
422169, 422171, 422172, 422174, 423212, 4232132, 4232137, 60272, 60273, 60274, 60275, 60282, 60299
Abstract:
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 γ-alumina catalyst. Current catalyst systems for the treatment of oxygen rich exhaust are capable of achieving only approximately 7 to 12% NOreduction 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 γ-alumina prepared by the sol gel method is capable of increasing the NOreduction to a level of approximately 90% in the absence of SOand 80% in the presence of 20 ppm of SO. Especially useful metals have been found to be indium, gallium, and tin.