A PROCESS FOR THE PREPARATION OF 1,1,1,2-TETRAFLUOROETHANE

摘要

The invention relates to a process for preparing a co-precipitated Cr2O3/Al2O3 catalyst promoted by zinc, said process comprising co-precipitation 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. The catalyst is used for the preparation of HFL-134a by fluorination of trichloroethylene and fluorination of the intermediate product of the former reaction (HCFC-133A).