Selective hydrogenolysis of dichlorodifluoromethane (CCl 2F 2) over CCA supported palladium bimetallic catalysts

• Published in: Applied catalysis. A, General Vol. 244; no. 1; pp. 39 - 48
• Main Authors: Chandra Shekar, S., Krishna Murthy, J., Kanta Rao, P., Rama Rao, K.S., Kemnitz, E.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 08.05.2003; Elsevier
• Subjects: Bimetallic catalysts; Carbon covered alumina; Catalysis; Catalytic reactions; Chemistry; Exact sciences and technology; General and physical chemistry; Hydrodechlorination; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; TPR; Bimetallic catalysts; Carbon covered alumina; Hydrodechlorination; TPR; Mixed catalyst; Barium; Organic perhalocompound; Hydrogenolysis; Antimony; Transition metal; Palladium; Fluorocarbon; Carbon; Supported catalyst; Zinc; Heterogeneous catalysis; Dechlorination; Chlorocarbon; Bismuth; Lanthanum; Platinoid; Alumina
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/S0926-860X(02)00569-0

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 CCl 2F 2. Bi and Sb promoters have been found to improve not only the thermal stability but also selectivity towards CH 2F 2. Sn bimetallic catalyst exhibited high selectivity towards CHClF 2. 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 CCl 2F 2 to maximize the CH 2F 2 yield.