Catalyst for exhaust gas purification and method for exhaust gas

Details Catalyst for exhaust gas purification and method for exhaust gas Catalyst for exhaust gas purification and method for exhaust gas

1993-04-12

1994-12-27

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 65, 502304, 502527, 4232137, B01J 2904, B01J 2340, B01J 3504

Patent

active

053766105

ABSTRACT:
A catalyst for exhaust gas purification has at least one monolith carrier, at least one first catalyst layer having a three-way catalytic activity, provided on the carrier, and a second catalyst layer having a hydrocarbon purification activity, provided on the first catalyst layer. In a gasoline engine automobile provided with the above catalyst for exhaust gas purification in the exhaust gas system, the hydrocarbons present in the exhaust gas can be converted at a high efficiency by introducing secondary air into the exhaust gas in front of the catalyst to make the exhaust gas lean, at the engine start when a large amount of unburnt hydrocarbons are present in the exhaust gas. Further, the engine warm-up property of the automobile can be improved by the heat generated by the catalytic reaction of the hydrocarbons. The catalyst further exhibits a three-way catalytic activity even during the steady state engine operation after warm-up.

REFERENCES:
patent: 4099377 (1978-07-01), Toshimura et al.
patent: 4170112 (1979-10-01), Bessho
patent: 4183212 (1980-01-01), Takagi
patent: 4448756 (1984-05-01), Hammerle et al.
patent: 5010051 (1991-04-01), Rudy

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