a process for preparing 1 , 1 - dichloro - 2 , 2 , 2 - trifluoroethane characterized in that 1 , 1 , 1 - trichloro - 2 , 2 , 2 - trifluoroethane is reduced with hydrogen in the presence of a hydrogenating catalyst comprising platinum to which at least one metal selected from the group consisting of silver , copper , gold , tellurium , zinc , chromium , molybdenum and thallium is added . 1 , 1 - dichoro - 2 , 2 , 2 - trifluoroethne can be obtained in a high yield .