A process for the preparation of co-precipitated chromium-aluminum catalyst impregnated with zinc chloride preparation of HFC-134a by the fluorination of trichloroethylene. The present invention is to reduce the relative percentage of strong acid sites in the catalyst in order to achieve high selectivity provide enough crushing strength to the catalyst for use under pressure. Accordingly, the present invention relates to a process for preparing a coprecipitated Cr2O3/Al2O3 catalyst promoted by zinc, said process comprising coprecipitation of chromium and aluminum metal hydroxides from corresponding trivalent metal salt solutions using NH4OH, NaOH or KOH as a base and followed by calcination to give mixed oxide precatalyst in amorphous form which is impregnated with an activity promoting amount of Zinc compound, wherein the chromium metal hydroxide used in a bulk chromia.
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