ABO(3) perovskite (A = Ca, Sr, Ba; B = Ti, Zr) has been prepared by a
sol-gel method from oxygenated (I) or chlorinated (II) precursors. The
difference in C-2-hydrocarbon selectivity depending on the preparatio
n mode is ascribed to the presence of chlorine. To understand the effe
ct of chlorine, the various catalysts have been characterized by XRD,
BET, O-2 temperature programmed desorption. Addition of organic chlori
nated compounds as probe molecules have been studied and compared on c
atalysts I and II.