The reaction intermediates formed during hydrodechlorination of CF2Cl2 catalyzed by Pd supported on AlF3 have been investigated using steady state and transient kinetics experiments. The formation of the coupling product C2H6 and its dependence on H-2 partial pressure have been used to investigate the pathways by which possible surface carbene species react. Reactions of surface species formed during the CF2Cl2 hydrodechlorination with scavenging agent C2H4 yielded addition products typical of metal-carbenes. Information from these experiments suggests that for carbene and fluorocarbene species formed on the surface of a Pd/AlF3 catalyst the rates of hydrogenation vs. coupling reactions are different.