High Quality Content by WIKIPEDIA articles! Cerium(III) oxide is an oxide of the rare earth metal cerium. It has chemical formula Ce2O3, and is gold-yellow in color. Cerium oxide is used as a catalytic converter for the minimisation of CO emissions in the exhaust gases from motor vehicles. When there is a shortage of oxygen, cerium(IV) oxide is reduced by carbon monoxide to cerium(III) oxide:2 CeO2 + CO -> Ce2O3 + CO2When there is an oxygen surplus, the process is reversed and cerium(III) oxide is oxidized to cerium(IV) oxide:

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