气相催化异构化氟氯烯烃的方法及机理解释

Gas-Phase Catalytic Isomerization of Tran-Chlorochloroolefin to Cis-Chlorochloroolefin and Its Potential Mechanism

气相催化是一种绿色环保的化工方法.氟氯烯烃是一种重要的化工原料,其中顺式和反式结构的氟氯烯烃具有较大的物理属性差异.我们旨在研发一种气相催化异构化氟氯烯烃的方法.首先以CF3CCl=CClCF3为原料,讨论了不同催化剂的气相异构化效率.其次,采用XRD、TPD、BET、XPS、GC、GC-MS等手段讨论了催化剂的组成、酸性强度、催化剂表面酸性种类、催化剂活性组分、异构化产物的组成情况.在此基础之上,提出了异构化的机理解释.最后,采用4种不同原料,验证了上述机理解释.为工业化生产提供了重要的理论依据.

Gas phase catalysis is a green chemical method.CFC(chlorofluorocarbon)is an important chemical raw material,where cis-and trans-CFC have different physical properties.The purpose of this paper is to develop a gas-phase catalytic isomerization of CFCs.The gas isomerization efficiency of different catalysts was discussed with CF3CCl=CClCF3(CFC-1316)as raw material.XRD,TPD,BET,XPS,GC and GC-MS were used to discuss the composition of catalyst,acid strength,pore size and specific surface area,acid species on catalyst surface,active components on catalyst surface and composition of isomerization products.On this basis,the potential mechanism of isomerization is proposed.Four different materials were used to verify the above mechanism.