LaCoO3 Perovskite Catalysts For the Environmental Application of Automotive CO Oxidation

Abstract

Perovskite-type oxides were synthesized through conventional citrate methods. The synthesized perovskite materials had the nominal compositions of LaCoO3, LaCo0.8Cu0.2O3, La0.8Sr0.2CoO3 and La0.8Sr0.2Co0.8Cu0.2O3. The catalytic activity of the perovskite samples (for CO oxidation) were measured using a stainless steel reactor with an inlet gas mixture containing exhaust composition as gasoline engine. The prepared perovskite samples were characterized by nitrogen adsorption (BET), EDX and XRD analyses. The perovskite catalysts showed good structural and chemical stability and high activity for the catalytic CO oxidation reaction. The catalyst samples prepared by the citrate method achieved the same CO conversion at lower temperatures than those prepared by the sol gel method. This was attributed to a better-formed perovskite crystals by the citrate method. Substituted perovskite composition showed higher activity for CO conversions higher than 90%. Hence, for the environmental application of the automotive emission control, it can completely eliminate the poisonous CO gas.