Catalysts for lean burn engine exhaust abatement
AssigneeThe Regents of the University of California
InventorsKevin C. Ott, Noline C. Clark, Mark T. Paffett
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Abstract
The present invention provides a process for catalytically reducing nitrogen oxides in an exhaust gas stream containing nitrogen oxides and a reductant material by contacting the gas stream under conditions effective to catalytically reduce the nitrogen oxides with a catalyst comprising a aluminum-silicate type material and a minor amount of a metal, the catalyst characterized as having sufficient catalytic activity so as to reduce the nitrogen oxides by at least 60 percent under temperatures within the range of from about 200° C. to about 400° C.
Claims7
A process for catalytically reducing nitrogen oxides in an exhaust gas stream containing nitrogen oxides and a reductant material comprising:
- contacting said gas stream under conditions effective to catalytically reduce said nitrogen oxides with a catalyst comprising an aluminum-silicate material and a metal in an amount of up to about 0.1 weight percent based on total weight of catalyst, said catalyst characterized as having sufficient catalytic activity so as to reduce the nitrogen oxides by at least 60 percent under temperatures within the range of from about 200° C. to about 400° C.
Dependencies are inferred from the claim text.