MgF_2-AlF_3催化剂用于四氟乙烷裂解制备三氟乙烯

Catalytic pyrolysis performance of MgF_2-AlF_3 catalysts for tetrafluoroethane to trifluoroethylene

采用沉积沉淀法和浸渍法制备了MgF2-AlF3催化剂,应用XRD、NH3-TPD、BET和拉曼光谱等对催化剂进行表征,并将催化剂应用于四氟乙烷裂解制备三氟乙烯反应。结果表明,沉积沉淀法制备的MgF2-AlF3-D具有较高的活性和反应稳定性。反应温度450℃时,四氟乙烷转化率为33.4%,三氟乙烯选择性大于99%。催化剂表面酸性和积炭是影响催化剂活性和稳定性的主要因素。

A series of MgF2-AlF3 catalysts were prepared by deposition precipitation method and impregnation method,and characterized by XRD,NH3-TPD,BET and Raman.The as-prepared catalysts were used in catalytic pyrolysis of tetrafluoroethane（HFC-134a） to trifluoroethylene（TrFE）.The results showed that MgF2-AlF3 catalysts prepared by deposition precipitation method exhibited higher activity and stability than those by impregnation method,and tetrafluoroethane conversion of 33.4% and the selectivity to trifluoroethylene of 99.8% were attained at reaction temperature 450 ℃.The strength of surface acid sites and carbon deposit on the catalyst surface were the main influencing factors of the catalyst activity and stability.