Carbon monoxide conversion catalyst

摘要

Catalyst articles comprising palladium and related methods of preparation and use are disclosed. Disclosed is a catalyst article comprising a first catalytic layer formed on a substrate, wherein the first catalytic layer comprises palladium impregnated on a ceria-free oxygen storage component and platinum impregnated on a refractory metal oxide, and a second catalytic layer formed on the first catalytic layer comprising platinum and rhodium impregnated on a ceria-containing oxygen storage component. The palladium component of the catalyst article is present in a higher proportion relative to the other platinum group metal components. The catalyst articles provide improved conversion of carbon monoxide in exhaust gases, particularly under rich engine operating conditions.

主权项

1. A catalyst article for use in an internal combustion engine comprising:
a first catalytic layer formed on a substrate, wherein the first catalytic layer comprises palladium impregnated on a ceria-free oxygen storage component and platinum impregnated on a refractory metal oxide, and; a palladium-free second catalytic layer formed on the first catalytic layer, the second catalytic layer comprising platinum and rhodium impregnated on a ceria-containing oxygen storage component, wherein the ceria-containing oxygen storage component is substantially free of refractory metal oxides and substantially free of non-ceria oxygen storage components, wherein the catalyst article is effective to reduce carbon monoxide in exhaust gas from the internal combustion engine.