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设计制备了一种新型微孔介孔复合核壳结构钛硅分子筛TS-1@Mesosilica(TS-1@MS),核为MFI结构钛硅分子筛TS-1,壳层为以非离子表面活性剂P123为模板剂组装形成的介孔氧化硅.壳层氧化硅具有三维蠕虫状孔道结构,有利于微孔和介孔部分的连通及反应物和产物的扩散.通过沉积沉淀法将金纳米粒子负载在壳层介孔孔道,和TS-1中的钛活性中心协同,形成适合于C3H6和H2、O2直接气相环氧化制备环氧丙烷(PO)的双功能催化材料.实验结果表明,Au/TS-1@MS在空速8000 mL g 1h 1、温度473 K条件下连续反应132 h,活性和选择性没有明显下降,丙烯转化率保持在3.7%左右,PO选择性87%以上.
A new type of microporous mesoporous composite core-shell structure TS-1 @ Mesosilica (TS-1 @ MS) was designed and synthesized. The core was TS-1 with the MFI structure titanosilicate molecular sieve TS- P123 as a template agent formed by the formation of mesoporous silica shell silica has a three-dimensional worm-like pore structure conducive to the microporous and mesoporous parts of the connectivity and diffusion of reactants and products by precipitation method gold nanoparticles loaded In the mesoporous shell of the shell, synergistic with the titanium active site in TS-1, a bifunctional catalysis material suitable for the direct gas phase epoxidation of C3H6 and H2 and O2 to form propylene oxide (PO) was formed.The experimental results show that the Au / TS-1 @ MS reacted at a space velocity of 8000 mL g 1h 1 and a temperature of 473 K for 132 h. The conversion of propylene was kept at about 3.7% and the selectivity of PO was over 87%.