Layered catalyst composite
AssigneeBASF Catalysts LLC
InventorsShau-Lin F. Chen, Harold Rabinowitz, Jin Sakakibara, Tian Luo
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Abstract
A layered, three-way conversion catalyst having the capability of simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides is disclosed. In one or more embodiments, the catalyst comprises three layers in conjunction with a carrier: a first layer deposited on the carrier and comprising palladium deposited on a refractory metal oxide and an oxygen storage component; a second layer deposited on the first layer and comprising rhodium deposited on a refractory metal oxide and an oxygen storage component; and a third layer deposited on the second layer and comprising palladium deposited on a refractory metal oxide.
Claims25
A layered catalyst composite comprising:
- (a) a cordierite carrier;
- (b) a first layer deposited on the carrier, said first layer comprising palladium deposited at a loading of up to about 50 g/ft3 on a promoter-stabilized refractory metal oxide support;
- (c) a second layer deposited on the first layer, said second layer comprising rhodium deposited at a loading of up to about 50 g/ft3 on a refractory metal oxide support;
- and (d) a third layer deposited on the second layer, said third layer comprising palladium deposited at a loading of up to about 100 g/ft3 on a promoter-stabilized refractory metal oxide support.
A method for treating a gas comprising hydrocarbons, carbon monoxide and nitrogen oxides which comprises flowing the gas to a catalyst member, and catalytically oxidizing the hydrocarbons and carbon monoxide and catalytically reducing the nitrogen oxides in the gas in the presence of the catalyst member, the catalyst member comprising a layered catalyst composite comprising:
- (a) a cordierite carrier;
- (b) a first layer deposited on the carrier, said first layer comprising palladium deposited at a loading of up to about 50 g/ft3 on a promoter-stabilized refractory metal oxide support;
- (c) a second layer deposited on the first layer, said second layer comprising rhodium deposited at a loading of up to about 50 g/ft3 on a refractory metal oxide support;
- and (d) a third layer deposited on the second layer, said third layer comprising palladium deposited at a loading of up to about 100 g/ft3 on a promoter-stabilized refractory metal oxide support.
Dependencies are inferred from the claim text.