高效结晶型DMC催化剂制备及其催化性能  

Preparation of Highly Active Double Metal Cyanide Complexes with High Crystalinity and its Catalytic Performance

作　　者：陈上[1] 吴元祥[1] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000

出　　处：《吉首大学学报（自然科学版）》2010年第5期89-92,共4页Journal of Jishou University(Natural Sciences Edition)

基　　金：国家自然科学基金资助资助(20704034);湖南省自然科学基金资助项目(07JJ6012)

摘　　要：以ZnO,Zn(OH)2,ZnCO3,碱式ZnCO3为前体,采用沉淀转化方法制备基于Zn3[Co(CN)6]2的双金属氰化络合物催化剂,研究了前体制备方法对其催化环氧丙烷与CO2共聚催化性能的影响.结果表明,以Zn(OH)2为前体制备的催化剂催化活性有最高,达到4 400 g/g以上,约为传统的溶液沉淀法制备的催化剂催化效率的2倍.该前体的凝聚态结构对催化剂效率影响很大,以ZnC l2和NaOH溶液制备得到的Zn5(OH)8C l2.H2O相能高效转化为催化剂活性结构,得到高效结晶型催化剂.催化剂催化活性也与前体的粒径有关,前体粒径大于75μm时,催化效率明显下降.Double metal cyanide complexes based on Zn3[Co（CN）6]2 were prepared by precipitate transformation from precursors such as ZnO,Zn（OH）2,ZnCO3,and basic ZnCO3,and the effect of preparative method on the catalytic efficiency towards copolymerization of propylene oxide and CO2 was investigated.The results show that DMC catalyst with Zn（OH）2 as precursor exhibits highest catalytic efficiency of over 4 400 g/g,which is about double catalytic efficiency compared with complexes derived from solution precipitation method.The morphology of this precursor has significant impact on resulting catalytic efficiency,the phase Zn5（OH）8Cl2·H2O produced by precipitating reaction of ZnCl2 and NaOH can be transferred effectively into active site of catalyst to afford highly active catalyst with high crystalinity.The study also shows that catalytic efficiency of final catalyst relates to average particle size of precursor,the catalytic efficiency decreases sharply while average particle size of precursor is great than 75 μm.

关 键 词：六氰合钴酸锌 氢氧化锌 催化剂 共聚 

分 类 号：O643[理学—物理化学]