Three-Way Activity and Sulfur Tolerance of Single Phase Perovskites

Abstract

Single phase perovskites, as LaCoO3, LaCrO3, La Co0 5 Cr0 5O3, La0.7Sr0 3CrO3 and La0 7Sr0 3Cr0 95Ru0 05O3, were synthesized and three-way activity and sulfur tolerance were measured in a pulse-flame catalyst testing system in a wide range of redox-potential (R). Comparison of activities indicates that perovskite with ruthenium ion has the best redox behaviour in the redox potential interval 0.75<R<1.40. On the basis of experimental data, the sulfur resistant matrix La0.7Sr0.3 CrO3 was synthetized and the highly active sulfur resistant ruthenium perovskite catalyst, was prepared. © 1991.