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6275477 
Book/Book Chapter 
1.14 Selective Hydrogenation of CFC-12 to HFC-32 on Zr-Pd/C Catalyst 
Ichikawa, M; Ohnishi, R; Wang, WL 
1994 
1 
Studies in surface science and catalysis
ISSN: 0167-2991 
Elsevier 
Studies in Surface Science and Catalysis 
90 
101-104 
Reaction of dichlorodifluoromethane(CFC-12) and chlorodifluoromethane(HCFC-22) with H2 was carried out on modified Pd catalysts. On 5wt% Pd/C, hydrogenation of CFC-12 gave mainly difluoromethane(HCF-32) at 200°C and methane at 350°C, respectively. Zr and V modifiers promoted to increase in activity with no change in selectivity and, thus, to enhance the yield of HFC-32. From temperature programmed reduction (TPR) measurements, formation of Pd-Zr hydride, which desorbed hydrogen at ca. 200°C, was observed. This hydride may play a role to supply active hydrogen in the reaction at the reaction temperature. 
Ono, Yoshio