Selective hydrogenolysis of dichlorodifluoromethane (CCl2F2) over CCA supported palladium bimetallic catalysts Original Research Article

La, Bi, Sb, Sn, Ba, and Zn are chosen for addition on carbon covered alumina (CCA) supported Pd catalyst. The effect of these second metals on supported Pd catalysts has been studied for the hydrogenolysis activity of CCl2F2. Bi and Sb promoters have been found to improve not only the thermal stability but also selectivity towards CH2F2. Sn bimetallic catalyst exhibited high selectivity towards CHClF2. This may be explained on the basis of the metal–metal interactions that influence the reducibility of the palladium. These improved properties arise due to inter-metallic compound formation as evidenced from the XRD and TPR data on CCA supported bimetallic palladium catalysts. The effect of addition of second metal on Pd/CCA catalyst is screened in terms of partial dehalogenation ability and thermal stability for hydrodechlorination activity of CCl2F2 to maximize the CH2F2 yield.