摘要
制备了基于Zn3[Co(CN)6]2的双金属氰化络合物催化剂,考察了其催化氧化环己烯/CO2共聚反应的特点,以及制备过程中有机配体和卤化锌种类对催化剂催化性能和共聚产物组成的影响.结果表明,该催化剂能高效催化共聚反应,在催化剂含量为1.8×10-4时其催化效率可达6 000 g/g以上,FT-IR和1H NMR表征证实聚合产物为接近交替的共聚物.催化剂催化效率受有机配体和卤化锌种类影响,但共聚物组成只受卤化锌种类影响,而不受有机配体种类影响,其中叔丁醇和ZnCl2分别是较好的有机配体和锌盐.动力学研究表明,该共聚反应对催化剂浓度是一级反应,反应的平均活化能为41.6 kJ/mol.
A Double metal cyanide complexes based on Zn3[Co（CN）6 ]2 were prepared and used for copolymerization of cyclohexene oxide with carbon dioxide. The catalytic characteristics and the effect of preparation conditions on catalytic performance and product composition were investigated. The results showed that these cata- lysts could catalyze copolymerization effectively. The catalytic efficiency could reach over 6 000 g/g when the catalyst content was 1.8×10^-4 , and the products were confirmed to be nearly alternative copolymers by FT-IR and ^lH NMR. The effects of complexing agents and zinc halides （ZnX2, X- F, Cl, Br, I） on catalytic performance were studied. The catalytic efficiency was influenced by the kind of complexing agents and zinc halides employed in preparation of catalysts. However, the composition of copolymers was only influenced by the kind of zinc halides. Among those complexing agents and zinc halides investigated, tert-butanol and zinc chloride were preferable, respectively. The kinetic study indicated that the initial reaction rate of copolymerization exhibited first order dependence on the catalyst content, and average activation energy of copolymerization was 41.6 kJ/mol.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2006年第4期355-360,共6页
基金
国家自然科学基金资助项目(50273031)
关键词
双金属氰化络合物
锌
钴
氧化环己烯
二氧化碳
共聚合
double metal cyanide complex
zinc
cobalt
cyclohexene oxide
carbon dioixde
copolymerization
