Supported perovskite-type oxide catalysts for the total oxidation of chlorinated hydrocarbons

The catalytic behaviour of supported (zirconia, cordierite monoliths) and u nsupported AMnO(3) (A=La, Didym-Di) perovskites was studied in the total ox idation of chlorinated hydrocarbons (CHC). By-products (higher chlorinated hydrocarbons, lower molecular coupling and cracking products) were formed a t reaction temperatures <550 degrees C. Porous zirconia as support enhances the catalytic activity at low perovskite contents and diminishes the by-pr oduct formation. The preparation method (impregnation or precipitation-depo sition of perovskites on zirconia and impregnation and coating of cordierit e monoliths with perovskites) influences catalytic activity and by-product formation. LaMnO3 and DiMnO(3) perovskite-type oxides reveal similar cataly tic behaviour. (C) 1999 Elsevier Science B.V. All rights reserved.