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AssigneeJohnson Matthey Public Limited Company
InventorsTODD HOWARD BALLINGER, HAI-YING CHEN, JULIAN PETER COX, SHADAB SHARIF MULLA, JEFFREY SCOTT RIECK, ERICH CONLAN WEIGERT
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A CO slip catalyst, for treating an exhaust gas from a lean burn internal combustion engine, is disclosed. The CO slip catalyst comprises palladium and a ceria-containing material. The invention also includes a method for oxidizing excess CO in an exhaust gas, wherein the excess CO results from the periodic contact of an upstream catalyst under rich exhaust conditions. The method comprises contacting the excess CO in the exhaust gas with a CO slip catalyst at a temperature in the range of 100 to 700° C.
An exhaust system for treating an exhaust gas from a lean burn internal combustion engine, said exhaust system comprising an upstream catalyst and a CO slip catalyst, where the CO slip catalyst comprises palladium and a ceria-containing material, and wherein the CO slip catalyst is located downstream of the upstream catalyst.
Dependencies are inferred from the claim text.