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Hierarchical micro-/mesoporous zeolite microspheres prepared by colloidal assembly of zeolite nanoparticles

机译:通过沸石纳米粒子的胶体组装制备的分层微/缺沸性微球

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A novel template-free colloidal assembly method that combines colloidal zeolite (silicalite-1) suspensions in a water-in-oil emulsion with an evaporation-induced assembly process has been developed for preparing hierarchical micro-/mesoporous zeolite microspheres (MZMs). Such particles have an interconnected mesoporosity and large mesopore diameters (25–40 nm) combined with 5.5 ? diameter micropores of the zeolite nanoparticles. The method developed has the advantages of employing mild synthesis conditions, a short preparation time, and not requiring the use of a mesoporogen template or post-treatment methods. The method provides a new range of micro-/mesoporous zeolites with tunable mesoporosity dictated by the size of the zeolite nanoparticles. It also offers the possibility of combining several zeolite particle sizes or optionally adding amorphous silica nanoparticles to tune the mesopore size distribution further. It should be generally applicable to other types of colloidal zeolite suspensions ( e.g. ZSM-5, zeolite A, beta) and represents a new route amenable for cost-effective scale-up.
机译:已经开发了一种新的一种无模板的胶体组装方法,其将胶体沸石(硅沸石-1)悬浮液与蒸发诱导的组装方法开发用于制备分层微/介孔沸石微球(MZMS)。这种颗粒具有相互连接的介孔率,大型中孔直径(25-40nm)与5.5组合合并?沸石纳米粒子的直径微孔。该方法开发的具有轻度合成条件的优点,制备时间短,并且不需要使用介孔模板或后处理方法。该方法提供了一种新的微/介孔沸石,其具有可调谐的中间渗透度,由沸石纳米颗粒的尺寸决定。它还提供了组合几种沸石粒度或任选地加入非晶硅纳米颗粒的可能性进一步调谐中孔尺寸分布。通常适用于其他类型的胶体沸石悬浮液(例如ZSM-5,沸石A,β),并且代表了一种用于成本效益扩展的新途径。

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