双金属氰化络合物催化CO_(2)/环氧丙烷共聚

Copolymerization of CO_(2)/Propylene Oxide Catalyzed by Bimetallic Cyanide Complex

以氯化锌和六氰钴酸钾为原料,合成了锌/钴双金属氰化络合物催化剂,研究了超声波在催化剂制备过程中的作用。采用红外光谱仪、扫描电子显微镜(SEM)研究了制备的催化剂的结构及形貌。红外光谱结果表明,不同条件下制备的催化剂均为锌/钴双金属氰化络合物结构。SEM结果表明,未采用超声波技术制备的催化剂为片层结构;采用超声波后,随着超声波功率增加及超声时间延长,催化剂的片层结构逐渐破碎。研究了锌/钴双金属氰化络合物催化剂在催化二氧化碳与环氧丙烷共聚中的催化性能,结果表明,未采用超声波制备的片层结构催化剂在聚碳酸亚丙酯合成中表现出较高的催化活性,催化效率最大为1509 g聚合物/g锌。采用超声波技术制备的催化剂由于片层结构破碎,催化活性中心被掩盖,失去活性。采用红外光谱仪和核磁共振波谱仪对合成的聚碳酸亚丙酯进行了表征,证明其结构正确。

Zinc/cobalt bimetallic cyanide complex catalyst had been synthesized from zinc chloride and potassium hexacyanocobalate.The effect of ultrasound on the preparation of the catalyst was studied.The structure and morphology of the prepared catalyst were studied by infrared spectroscopy and scanning electron microscopy.The results of infrared spectra showed that the catalysts prepared under different conditions were zinc/cobalt bimetallic cyanide complex.SEM results showed that the catalyst prepared without ultrasonic wave was a lamellar structure.The lamellar structure of the catalyst was gradually broken with the increase of ultrasonic power and ultrasonic time.The catalytic performance of zinc/cobalt bimetallic cyanide complex catalyst in the copolymerization of carbon dioxide and propylene oxide was studied.The results showed that the lamellar structure catalyst prepared without ultrasound showed high catalytic activity in the synthesis of propylene carbonate,and the highest catalytic efficiency was 1509 g polymer/g zinc.The catalyst prepared by ultrasound was deactivated because the catalytic active center was covered due to the fragmentation of lamellar structure.The synthesized propylene carbonate was characterized by infrared spectrometer and nuclear magnetic resonance spectrometer,and its structure was proved to be correct.