Chloromethane, dichloromethane and 1,2-dichloroethane were completely decom
posed in air on perovskite-type catalysts (LaMnO3, LaCoO3, (La0.84Sr0.16)(M
n-0.67,Co-0.33)O-3) at reaction temperatures above 550 degrees C. Besides t
he main reaction products (carbon dioxide, water and hydrochloric acid), by
-products (higher chlorinated-, C-C coupling- and cracking products) were f
ormed in the low temperature range. Depending on the reaction temperature,
residence time and kind of chlorinated hydrocarbon a reversible catalyst de
activation takes place. In the case of LaCoO3 catalysts an irreversible dea
ctivation was observed. X-ray diffraction (XRD) and electron probe microana
lysis (EPMA) measurements with the perovskite-type catalysts after interact
ion of chlorinated hydrocarbons indicate the formation of chlorinated speci
es on the catalyst surface and in the bulk. (C) 1998 Elsevier Science B.V.
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