WELL-DISPERSED PEROVSKITE-TYPE OXIDATION CATALYSTS

A novel technique for the preparation of highly dispersed rare-earth p erovskite LaCoO3 catalysts was developed. Using the conventional compl exation and pyrolysis methods, an etchable component, zinc oxide (ZnO) , was introduced into the precursor by adding zinc nitrate during prep aration. After calcination, the independent ZnO phase was extracted by an aqueous NH4Cl solution, resulting in well-dispersed LaCoO3 catalys ts with a surface area of over 30 m(2)/g. DTA-reaction tests using CO oxidation as the model reaction were performed as a quick means to ill ustrate the higher catalytic oxidation activities of the prepared LaCo O3 catalysts mainly due to their high surface area. (C) 1998 Elsevier Science B.V.