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首页> 外文期刊>Chemistry: A European journal >Hierarchical mesoporous zeolites: Direct self-assembly synthesis in a conventional surfactant solution by kinetic control over the zeolite seed formation
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Hierarchical mesoporous zeolites: Direct self-assembly synthesis in a conventional surfactant solution by kinetic control over the zeolite seed formation

机译：层状介孔沸石：在常规表面活性剂溶液中通过动力学控制沸石晶种形成直接自组装合成

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By kinetic control over the zeolite seed formation, we report the direct fabrication of hierarchical mesoporous zeolites using hexadecyl trimethyl ammonium bromide (CTAB) as the soft template in a conventional solution route. Nanometer-sized, subnanocrystal-type zeolite seeds with a high degree of polymerization are essential to prevent the formation of a separate amorphous mesoporous phase and the phase separation between the mesophase and zeolite crystals in the presence of CTAB and a certain amount of ethanol. The mechanisms for the formation of hierarchically porous zeolites in the solution process, including the effect of mother liquid aging, formation of subnanocrystal zeolite seeds and their self-assembly effect with CTAB, and the role of ethanol are proposed and discussed in detail. The prepared mesoporous ZSM-5 zeolite showed much higher catalytic activity than conventional counterparts for aldol condensations involving large molecules, especially in the synthesis of vesidryl.
机译：通过对沸石晶种形成的动力学控制，我们报告了在常规溶液路线中使用十六烷基三甲基溴化铵（CTAB）作为软模板直接制备分级介孔沸石的方法。具有高度聚合度的纳米级亚纳米晶型沸石晶种对于防止单独的无定形介孔相的形成以及在CTAB和一定量乙醇存在下介晶相和沸石晶体之间的相分离至关重要。提出并详细讨论了固溶过程中分层多孔沸石形成的机理，包括母液老化的影响，亚纳米晶沸石种子的形成及其与CTAB的自组装作用，以及乙醇的作用。对于涉及大分子的醛醇缩合，特别是在合成vesidryl中，所制备的介孔ZSM-5沸石显示出比常规同行更高的催化活性。

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