Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And additional al or si containing component
Patent
1992-11-03
1994-07-19
Dees, Carl F.
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
And additional al or si containing component
502 64, B01J 2116, B01J 2906
Patent
active
053309456
ABSTRACT:
A preferred catalytically active solid acid material, zeolite, forms the basis of a washcoat effective for treating diesel-fueled engine exhaust to reduce emission of particulate. In a preferred method, hydrocarbon in exhaust is cracked and oxidized in the presence of a zeolite/silica washcoat mixture catalyzed with precious metal. A preferred Y-type zeolite provides acidic (cationic) sites having releasable cations which are exchanged with precious metal to form catalyzed zeolite. A preferred method of making the catalyzed zeolite/silica washcoat is provided, whereby colloidal silica is disposed as a barrier over the catalyzed washcoat, limiting exposure of catalyst to sulfur constituents in the exhaust.
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Beckmeyer Richard F.
Tsang Chih-Hao
Dees Carl F.
General Motors Corporation
Grove George A.
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