present invention is not limited to this embodiment any fluorination catalysts known in the art may be used in this process suitable catalysts include but are not limited to chromium aluminum cobalt manganese nickel and iron oxides hydroxides halides oxyhalides inorganic salts thereof and their mixtures and any one of which may be optionally fluorinated combinations of catalysts suitable for the present invention nonexclusively include cr 2 o 3 fecl 3 c cr 2 o 3 al 2 o 3 cr 2 o 3 alf 3 cr 2 o 3 carbon cocl 2 cr 2 o 3 al 2 o 3 nicl 2 cr 2 o 3 al 2 o 3 cocl 2 alf 3 nicl 2 alf 3 and mixtures thereof chromium oxide aluminum oxide catalysts are described in u s pat no 5 155 082 which is incorporated herein by reference chromium iii oxides such as crystalline chromium oxide or amorphous chromium oxide are preferred with amorphous chromium oxide being most preferred chromium oxide cr 2 o 3 is a commercially available material which may be purchased in a variety of particle sizes fluorination catalysts having a purity of at least 98 are preferred the fluorination catalyst is present in an excess but in at least an amount sufficient to drive the reaction the compound of formulas i ii and or iii is also provided to the vaporizer with at least.