沉淀转化法制备高效结晶型DMC催化剂

Preparation of highly active double metal cyanide complexes with high crystalinity by precipitate transformation method

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。研究表明，以Zn（OH）2为前体制备的催化剂催化活性有最高，达到4400g，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，并且前体的晶态完整性与催化剂催化活性有关联性。

Double metal cyanide complexes based on Zn3[Co（CN）6]2 were prepared by precipitate transformation from precursor 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 showed that Zn（OH）2 was best precursor among them, highly active DMC catalyst with high crystalinity could be obtained. The resulting complexes demonstrated over 4400 g/g Zn3[Co（CN）6]2, which was about double catalytic efficiency compared with complexes derived from solution precipitation method. The study also showed that crystallinity of precursor correlates with catalytic activity of final catalyst.