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用表面改性和金属嫁接相结合的双核移植法制备了SiO2 负载的双核配合物催化剂Cu2 (OAc) 2 /SiO2 ,用络合滴定、IR、固定相UV Vis光谱和磁分析方法表征了催化剂表面的化学组成、桥基配体的配位方式、金属离子的价态和配位环境 .根据实验结果 ,给出了催化剂的总体模型 ,并讨论了催化剂的形成机理 .运用TPD和insitu IR技术研究了催化剂对CO2 和环氧乙烷 (EO)的化学吸附特性及催化合成碳酸乙烯酯 (EC)的反应性能 .实验结果表明 ,CO2 和EC在催化剂表面形成桥式化学吸附态 ,其脱附峰温度分别为 12 0℃和130℃ ;催化剂对CO2 和EO合成EC有良好的催化活性 .
The binuclear complex catalyst Cu2 (OAc) 2 / SiO2 with SiO2 loading was prepared by binuclear implantation combined with surface modification and metal grafting. The complexation titration, IR, stationary phase UV Vis spectroscopy and magnetic analysis were used to characterize the surface of the catalyst Based on the experimental results, the overall model of the catalyst is given, and the formation mechanism of the catalyst is discussed.Using TPD and insitu IR technology to study the chemical composition of the bridge, ligand coordination mode, metal valence and coordination environment. The chemisorption characteristics of CO2 and ethylene oxide (EO) and the catalytic performance of the catalyst for the synthesis of ethylene carbonate (EC) were investigated.The experimental results show that CO2 and EC form a bridge chemisorption state on the catalyst surface, and the desorption peak The temperature is 120 ℃ and 130 ℃ respectively; the catalyst has good catalytic activity for the synthesis of CO2 and EO.