Two-stage catalyst system for lean burn engines

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine

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422171, 422177, 422211, 4232135, 4232391, 423246, 423247, 502261, 502262, 502304, 502306, 502325, 502332, 502333, 502334, 502339, 60274, 60301, B01J 2106

Patent

active

053993241

ABSTRACT:
The present invention broadly relates to a catalyst system for promoting oxidation-reduction reactions of the exhaust gases produced by an internal combustion engine wherein the catalyst comprises a two-stage system of a first-stage nitric oxide removal (by reduction) catalyst and a second-stage carbon monoxide and hydrocarbon removal (by oxidation) catalyst. The first-stage catalyst comprises between about 0.1 and 3% by weight tungsten carried on a support material comprising mostly .gamma.-alumina. The second-stage catalyst is an oxidation catalyst such as platinum on alumina.

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