采用原位微波水热合成Mn-Ti-Al-MCM-41介孔分子筛,并以双氧水为氧化剂和微波加热,研究了该介孔分子筛在苯乙烯环氧化反应中的催化性能. 利用XRD、29Si MAS-NMR、N2吸附、SEM-EDS和HRTEM手段对该材料进行了表征,结果表明它具有典型的六方相介孔结构、高的比表面积以及窄的孔径分布. 本实验表明Mn-Ti-Al-MCM-41的新颖合成方法加速了整个合成时间: 从几天到几个小时. 在催化苯乙烯液相环氧化实验中该材料具有较高的催化活性. 而且利用本实验合成的介孔分子筛与传统方法制备的在较大程度上提高了对苯基环氧乙烷的选择性.
Mesoporous molecular sieves Mn-Ti-Al-MCM-41 prepared by in situ microwave hydrothermal synthesis were studied for the epoxidation of styrene with H2O2 under microwave irradiation. Characterization by XRD, 29Si MAS NMR, N2 physisorption, SEM - EDS and HRTEM revealed that the materials had a typical hexagonally arranged mesoporous structure with high surface area and narrow pore size distribution. The novel synthesis method of Mn-Ti-Al-MCM-41 shortened the synthesis time from days to hours and the as-synthesized materials had a higher catalytic activity in the liquid-phase epoxidation of styrene and greatly improved the selectivity for styrene oxide.
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