초록 ▼

This invention relates to an automotive exhaust gas treatment catalyst composed of one or more noble metals dispersed on CeO2-RE2O3 carrier particles. The ceria-rare earth oxide carrier for the noble metal facilitates the simultaneous oxidation of CO and decomposition of NO. The catalyst is particul

This invention relates to an automotive exhaust gas treatment catalyst composed of one or more noble metals dispersed on CeO2-RE2O3 carrier particles. The ceria-rare earth oxide carrier for the noble metal facilitates the simultaneous oxidation of CO and decomposition of NO. The catalyst is particularly useful when the air-fuel mixture to the automobile engine is continually cycled between fuel rich and fuel lean of stoichiometric proportions.

대표청구항 ▼

In the method of treating the exhaust gas from a hydrocarbon-fueled internal combustion engine comprising continually cycling the air-fuel mixture supplied to the engine between a fuel-rich condition and a fuel-lean condition while contacting the exhaust gas with a catalyst comprising one or more no

In the method of treating the exhaust gas from a hydrocarbon-fueled internal combustion engine comprising continually cycling the air-fuel mixture supplied to the engine between a fuel-rich condition and a fuel-lean condition while contacting the exhaust gas with a catalyst comprising one or more noble metals dispersed on ceramic carrier particles, the improvement in which the carrier particles comprise a crystalline solid solution of 80 to 95 mole percent CeO2 and 5 to 20 mole percent RE2O3 where RE is a rare earth metal, which solid solution is capable of absorbing more oxygen than pure ceria under net oxidizing conditions.