论文部分内容阅读
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、29SiMAS-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.
The mesoporous molecular sieves Mn-Ti-Al-MCM-41 were hydrothermally synthesized by in-situ microwave heating and the catalytic performance of the mesoporous molecular sieves was investigated by means of hydrogen peroxide as oxidant and microwave heating. 29SiMAS-NMR, N2 adsorption, SEM-EDS and HRTEM.The results show that it has a typical hexagonal mesoporous structure, high specific surface area and narrow pore size distribution.The experimental results show that Mn-Ti-Al -MCM-41’s novel synthesis method accelerated the whole synthesis time: from a few days to a few hours in the catalytic liquid-phase epoxidation of styrene in the material has a high catalytic activity and the use of the experimental synthesis of mesopores The preparation of zeolites and conventional methods to a large extent improve the selectivity to phenylene oxide.