82 Catalytic materials for the synthesis of hydrofluorocarbons

摘要: HFC-125 (pentafluoroethane) can be synthesized by reaction in gas phase of HCFC-124 (1,1,1,2-tetrafluoro-2-chloroethane) with HF over chromium oxides supported on AlF3. The AlF3 support shows catalytic activity the halogen exchange but also production CFC-1113 (1,1,2-trifluoro-2-chloroethene) 1,2 elimination and oligomers adsorbed catalyst. introduction amorphous or microcrystalline phases oxide determines a progressive increase reduction yield olefinic by-product CFC-1113. To limit oligomers, composition catalyst is modified elements like magnesium calcium both coimpregnation sequence impregnation.