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首页> 外文期刊>Crystal growth & design >Design of MFI Zeolite-Based Composites with Hierarchical Pore Structure: A New Generation of Structured Catalysts
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Design of MFI Zeolite-Based Composites with Hierarchical Pore Structure: A New Generation of Structured Catalysts

机译：具有分层孔隙结构的MFI沸石基复合材料的设计：新一代结构化催化剂

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Zeolite/glass composite materials with hierarchical trimodal pore size distributions have been successfully prepared and subsequently characterized. Starting from glass monoliths having meso- and macropores, additional microporosity was introduced while allowing the growth of zeolite crystals via partial recrystallization of the glass support into ZSM-5 zeolite phase. Structured zeolitic catalytic materials were produced using a combination of supramolecular templating methods to produce the glass Support, followed by conventional self-assembly of template cations and silica species. Zeolite crystals are therefore in intimate contact with the glass Support, featuring micropores in addition to the mesopores. Hence. these zeolite/glass composites exhibit enhanced diffusional properties in comparison with purely microporous zeolite materials. These enhanced mass transport propel-ties allowed improvement of the selectivity toward light olefins in the important n-hexane cracking reaction.
机译：具有分级三峰孔径分布的沸石/玻璃复合材料已经成功制备并随后表征。从具有中孔和大孔的玻璃整体料开始，引入了额外的微孔性，同时允许通过玻璃载体的部分重结晶为ZSM-5沸石相来生长沸石晶体。使用超分子模板方法的组合来生产结构化的沸石催化材料，以生产玻璃载体，然后进行常规的模板阳离子和二氧化硅物种的自组装。因此，沸石晶体与玻璃载体紧密接触，除了中孔外还具有微孔。因此。与纯微孔沸石材料相比，这些沸石/玻璃复合材料表现出增强的扩散性能。这些增强的传质推进性能提高了重要正己烷裂化反应中对轻烯烃的选择性。

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