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.