双金属氰化络合物(DMC)催化剂的热分析表征

Thermal analysis characterization of dual metal cyanide complex catalyst

参照热重(TG)曲线,用自制装置分段收集双金属氰化络合物(DMC)催化剂在不同温度区间的热分解产物,用色-质联用(GC-MS)等仪器进行分析.根据释放温度初步判断催化剂中各种配体的结合状态,并讨论了配体结合状态与催化活性之间的关系.除有机配体和水含量的相对多少外,DMC催化剂的活性和以配位方式与金属离子结合的有机配体的量关系更大,以配位方式结合的有机配体越多,则催化活性越高.DMC催化剂中Co3+与CN-的配位作用较六氰钴酸锌中弱.

Refer to the thermal gravimetric （TG） curves, the thermal decomposition products of double metal cyanide complex （DMC） catalysts in different temperature range were collected by using a specially designed device, and analyzed with GC-MS etc. The binding states of each kind of ligands were estimated according to their releasing temperature. The relation between the binding state of ligands and the catalytic activity of DMC catalyst was investiga- ted. Besides the content of water and organic ligands, the catalytic activity of DMC catalyst was more sensitive to the quantity of organic ligands coordinated to metal ions. The more the quantity of organic ligands coordinated to metal ions was, the more active was the DMC catalyst. The coordination of cyanides and Co^3- in DMC catalyst was less firm than that in Zn3[Co（CN）6]2·xH2O.