Zeolite/catalyst wall-flow monolith adsorber

Details Zeolite/catalyst wall-flow monolith adsorber Zeolite/catalyst wall-flow monolith adsorber

1993-03-08

1996-02-20

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422169, 422171, 422177, 55523, 55DIG30, 60297, 502 66, B01D 5354

Patent

active

054926793

ABSTRACT:
An exhaust system for an internal combustion engine having a primary catalytic converter located downstream of the engine and a hydrocarbon adsorber located downstream of the primary converter. The adsorber comprises a ceramic wall-flow substrate having a zeolite coating, having the ability to selectively adsorb hydrocarbon molecules from exhaust gas, applied to the interior surfaces of the inlet passages of the substrate and a catalytic coating applied to the adjacent surfaces of the walls of the outlet passages of the substrate. The catalyst preferably has a light-off temperature below the desorption temperature of the zeolite. In operation, hydrocarbon is adsorbed by the zeolite following a cold engine start and is held until the zeolite reaches its desorption temperature at which time the hydrocarbon is released and passes through the porous walled substrate for conversion by the catalyst.

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patent: 5089237 (1992-02-01), Schuster et al.
patent: 5164350 (1992-11-01), Abe et al.
SAE Technical Paper Series #920847 entitled "Cold-Start Hydrocarbon Collection for Advanced Exhaust Emission Control" Martin J. Heimrich, Lawrence R. Smith, Jack Kitowski.

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