Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Patent
1990-11-27
1992-04-28
Kummert, Lynn
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
422177, 422180, 422190, 422211, 422222, 55482, 55524, 55DIG30, 60299, 60301, B01D 5336, F01N 328
Patent
active
051087162
ABSTRACT:
A catalytic converter for purification of exhaust gas discharged from an automotive internal combustion engine. The catalytic converter is comprised of first and second three-way catalysts disposed in a casing. The first catalyst is located upstream of the second catalyst relative to the stream of exhaust gas in the catalytic converter. Each catalyst is formed therein with many exhaust gas passages through which exhaust gas passes. Each catalyst includes a honeycomb type monolithic ceramic substrate having many cells each defined by walls in the substrate. At least a part of each cell serves as the exhaust gas passage. A wash coating is formed on the surface of the walls in the substrate and contains cerium. Catalytic noble metals are carried by the wash coating. The amount of the catalytic noble metals, per a unit volume of the catalyst, carried by the wash coating in the first catalyst is more than that in the second catalyst, thereby improving activation promoting characteristics of the first catalyst at low temperatures.
REFERENCES:
patent: 4072471 (1978-02-01), Morgan, Jr. et al.
patent: 4134733 (1979-01-01), Volker et al.
patent: 4388275 (1983-06-01), Fratzer et al.
Kummert Lynn
Nissan Motor Company, Inc.
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