分子筛固载席夫碱过渡金属配合物催化丙烯环氧化

he Ti-MCM-41 mesoporous molecular sieve was synthesized under hydrothermal condition with silica, ammonia and other low-cost raw materials, γ-aminopropyltriethoxysilane was used to modify the molecular sieve. The precursors of zeolite catalyst was synthesized by the reaction with salicylaldehyde. The ultimate catalysts of zeolite immobilizing schiff base transition metal Cu2+, Mn2+, Ag+, Fe3+, Co2+ were obtained by impregnation method and the catalyst was used in the reaction of the epoxidation of propylene. The structures and composition of the catalysts were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy. The results showed that: the modification of zeolite surface did not destroy its original mesoporous structure; zeolite surface with weak alkaline inhibit the occurrence of side effects; zeolite immobilizing manganese complex showed the best performance with 42.5% conversion rate of H2O2 and 92.6% selectivity of propylene oxide.