【摘要】 研究了具有MWW结构的新一代钛硅分子筛Ti-MWW催化剂对烯丙基氯液相环氧化高效合成环氧氯丙烷的催化性能.结果表明,Ti-MWW的催化活性以及产物选择性均优于传统的钛硅分子筛TS-1.对于Ti-MWW,合适的溶剂为非质子性溶剂丙酮和乙腈,在该溶剂中环氧化物不易发生溶剂化开环反应;而对于TS-1,合适的溶剂是质子性溶剂甲醇,但甲醇可导致醇醚副产物的生成.在Ti-MWW催化剂上烯丙基氯的转化率和环氧氯丙烷的选择性都能达到99%以上.更多还原

【Abstract】 Liquid-phase epoxidation of allyl chloride with hydrogen peroxide was carried out over Ti-MWW,a novel titanosilicate with the MWW structure,to synthesize epichlorohydrin selectively and effectively.Ti-MWW proved to be superior to the conventional TS-1 catalyst in both catalytic activity and product selectivity.Ti-MWW prefers aprotic solvents of acetone and acetonitrile,both of which can restrain the solvolysis of epichlorohydrin,whereas TS-1 favors a protic solvent of methanol.It is possible to achieve the conversion of allyl chloride and selectivity for epichlorohydrin as high as 99% on Ti-MWW.更多还原