Catalyst article for treating exhaust gas, its method of manufacture and uses thereof
AssigneeJohnson Matthey Public Limited Company
InventorQinghe ZHENG
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Abstract
The present invention provides a catalyst article for treating exhaust gas, the catalyst article comprising a substrate and a first catalytic region disposed on the substrate, wherein the first catalytic region comprises: a first oxygen storage capacity (OSC) material; and a first alumina support material having a first platinum group metal (PGM) component supported thereon; wherein the first alumina support material comprises theta alumina and the first PGM component comprises Pd and Rh.
Claims19
A catalyst article for treating exhaust gas, the catalyst article comprising a substrate and a first catalytic region disposed on the substrate, wherein the first catalytic region comprises:
- a first oxygen storage capacity (OSC) material;
- and
- a first alumina support material having a first platinum group metal (PGM) component supported thereon;
- wherein the first alumina support material comprises theta alumina and the first PGM component comprises Pd and Rh.
A method of manufacturing a catalyst article for treating exhaust gas, the method comprising:
- providing a substrate;
- providing a washcoat slurry comprising a first OSC material, a first alumina support material and a first PGM component, wherein the first alumina support material comprises theta alumina and the first PGM component comprises Pd and Rh;
- and
- coating the substrate with the washcoat slurry to provide a catalyst article.
Use of theta alumina as a support material for Rh and Pd in a catalyst article to reduce the total hydrocarbon (THC), CO and/or NOx light-off temperature of the catalyst article.
Dependencies are inferred from the claim text.