Catalysts for lean burn engine exhaust abatement

Details Catalysts for lean burn engine exhaust abatement Catalysts for lean burn engine exhaust abatement

2006-08-01

2006-08-01

Johnson, Edward M. (Department: 1754)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C423S239200

Reexamination Certificate

active

07083765

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.

REFERENCES:
patent: 5776423 (1998-07-01), Feeley et al.
patent: 5807528 (1998-09-01), Nakano et al.
patent: 5869013 (1999-02-01), Tabata et al.
patent: 6001320 (1999-12-01), Addiego

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