Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Reexamination Certificate
2005-01-25
2005-01-25
Tran, Hien (Department: 1764)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
C422S171000, C422S180000
Reexamination Certificate
active
06846464
ABSTRACT:
The present invention discloses a method for reducing NOxin exhaust gases of an internal combustion engine. The purpose of this invention is to convert engine out NOx(approximately 90% NO in diesel exhaust) into roughly a 50:50 mixture of NO and NO2, while simultaneously oxidizing engine-out hydrocarbons which interfere with the reduction of NOxby urea or ammonia. The present invention demonstrates that a 50:50 blend of NO and NO2is reduced more rapidly and with higher efficiency than a gas stream which is predominantly NO. In addition, catalyst in an engine exhaust that is a 50:50 mixture of NO and NO2is far more resistant to hydrothermal deterioration than using NO alone. In another embodiment of the present invention, a vehicle exhaust system utilizing the method of the present invention is provided.
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Montreuil Clifford Norman
Theis Joseph Robert
Brooks & Kushman P.C.
Ford Global Technologies LLC
Porcari Damian
Tran Hien
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