초록 ▼

A reaction comprising the oxidation of carbon monoxide to carbon dioxide, eg in vehicle exhausts, employs a catalyst composed of metal oxide, eg. ceria, particles among which are uniformly incorporated noble metal particles, the particles having such a high interaction that, without hydrogen reducti

A reaction comprising the oxidation of carbon monoxide to carbon dioxide, eg in vehicle exhausts, employs a catalyst composed of metal oxide, eg. ceria, particles among which are uniformly incorporated noble metal particles, the particles having such a high interaction that, without hydrogen reduction pre-treatment, the catalyst exhibits the formation of anionic vacancies on the metal oxide surface at a temperature lower than does the corresponding catalyst prepared by impregnation. The catalyst employed is preferably prepared by co-precipitation.

대표청구항 ▼

[ We claim:] [1.] A method of conducting a chemical reaction employing a catalyst composed of metal oxide particles among which are uniformly incorporated noble metal particles, the catalyst having such a high interaction between the noble metal particles and the metal oxide particles that, without

[ We claim:] [1.] A method of conducting a chemical reaction employing a catalyst composed of metal oxide particles among which are uniformly incorporated noble metal particles, the catalyst having such a high interaction between the noble metal particles and the metal oxide particles that, without hydrogen reduction pre-treatment, it exhibits the formation of anionic vacancies on the metal oxide surface at a temperature lower than that of the corresponding catalyst, without hydrogen reduction pre-treatment, containing the same amount of the metal oxide particles and noble metal particles and prepared by impregnating the metal oxide particles with noble metal precursor and calcining to convert the precursor to the noble metal particles, wherein the metal oxide comprises CeO.sub.2 and the noble metal is one or more members selected from the group consisting of Pt, Pd, Rh and Au.