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LaCoO3 perovskite catalysts for the environmental application of Auto motive CO oxidation

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Author Affiliations

  • 1Department of Chemical Engineering, Institute of Technology, Nirma University, Ahmedabad-382481, INDIA

Res. J. Recent Sci., Volume 1, Issue (ISC-2011), Pages 178-184,(2012)

Abstract

Perovskite-type oxides were synthesized through conventional citrate methods. The synthesized perovskite materials had thenominal compositions of LaCoO3, LaCo0.8Cu0.2O3, La0.8Sr0.2CoO3 and La0.8Sr0.2Co0.8Cu0.2O3. The catalytic activity of theperovskite samples (for CO oxidation) were measured using a stainless steel reactor with an inlet gas mixture containingexhaust 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 thecatalytic CO oxidation reaction. The catalyst samples prepared by the citrate method achieved the same CO conversion atlower temperatures than those prepared by the sol gel method. This was attributed to a better-formed perovskite crystals by thecitrate method. Substituted perovskite composition showed higher activity for CO conversions higher than 90%. Hence, for theenvironmental application of the automotive emission control, it can completely eliminate the poisonous CO gas.

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