双金属络合催化剂中心金属对环氧丙烷/二氧化碳共聚影响(英文)

Copolymerization of Carbon Dioxide and Propylene Oxide by DMC: Effect of Central Metal on Catalytic Performance

合成了一系列基于Zna[M(CN)b]c(M=Fe2+,Cr3+,Ni2+,Co3+,Mn3+,Mo4+,Cd2+和Fe3+)的双金属络合催化剂,并且用于催化环氧丙烷和二氧化碳的共聚反应,以研究中心金属对催化剂催化性能的影响。实验结果表明中心金属对催化剂催化性能影响很大,其中以Co3+,Ni2+为中心金属的催化剂具有较高的催化效能,分别达到2000和482g/g,而以Cd2+,Mn3+为中心金属的催化剂几乎没有催化活性。以Co3+,Ni2+,Fe3+为中心金属的催化剂能得到x(CO2)大于0.3的共聚物,而其它催化剂的共聚产物的x(CO2)小于0.1。

A series of double metal cyanide （DMC） complexes based on Zna [ M （CN） b ] c （ M = Fe^2＋ , Cr^3＋ , Ni^2 ＋ , Co^3＋ , Mn^3＋ , Mo^4＋, Cd^2＋ and Fe^3＋） were prepared and employed as catalysts for copolymerization of propylene oxide and CO2 to investigate the effect of central metal on catalytic performance. The results showed that the efficiency of catalysts and the composition of products varied significantly with change of central metal. The DMC based on Co^3＋ , Ni^2＋ exhibited highest efficiency among these catalysts, which was 2000 and 482 g/g, whereas the DMC based on Cd^2＋ , Mn^3＋ nearly exhibited no catalytic activity towards copolymerization. The copolymer with molar fraction of CO2 （x（ CO2 ） ）greater than 0. 3 could be obtained when DMC based on Co^3＋ , Ni^2＋ , Fe^3＋ were employed, in contrast copolymes with low x（ CO2 ） （ ≤0. 1 ）produced in most cases for other catalysts.