Exhaust gas treatment catalyst
AssigneeBASF Catalysts LLC
InventorsShau-Lin Franklin Chen, Zhicheng Hu
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Abstract
Provided are an exhaust treatment catalyst and an exhaust article containing the catalyst. The catalyst comprises a carrier; a first layer deposited on the carrier, said first layer comprising substantially only at least one refractory metal oxide; a second layer deposited on the first layer, said second layer comprising substantially only at least one oxygen storage component and at least one binder therefore; and a third layer deposited on the second layer, said third layer comprising at least one layer of one or more platinum group metal components supported on a refractory metal oxide support.
Claims18
An exhaust gas treatment article comprising:
- a catalyst, an upstream EGO or air/fuel ratio sensor and a downstream EGO sensor, wherein the catalyst comprises:
- (a) a carrier;
- (b) a first washcoat layer deposited on the carrier, said first washcoat layer comprising substantially only at least one refractory metal oxide;
- (c) a second washcoat layer deposited on the first washcoat layer, said second washcoat layer comprising substantially only at least one oxygen storage component and at least one binder therefor;
- and
- (d) a third washcoat layer deposited on the second washcoat layer, said third washcoat layer comprising at least one washcoat layer of one or more platinum group metal components supported on a refractory metal oxide support, wherein the amount of oxygen storage component in the second layer is present in an amount sufficient so that deterioration of its oxygen storage capacity can be correlated with deterioration of the catalyst's ability to reduce hydrocarbons, carbon monoxides or nitrogen oxides in the exhaust gas.
Dependencies are inferred from the claim text.