Exploring the impact of synthetic strategies on catalytic cracking in hierarchical beta zeolites via hydrothermal desilication and organosilane-templated synthesis,Catalysis Science & Technology

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Exploring the impact of synthetic strategies on catalytic cracking in hierarchical beta zeolites via hydrothermal desilication and organosilane-templated synthesis
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-06-25 , DOI: 10.1039/d0cy01209b
Ke Zhang _{1,

2,

3,

4} , Sergio Fernandez _{1,

2,

3,

4} , Elisha S. Converse _{1,

2,

3,

4} , Sarah Kobaslija _{1,

2,

3,

4}

Affiliation

Hierarchical zeolites can be synthesized by different strategies (e.g. top-down or bottom-up), resulting in the creation of mesoporosity with different configurations (inter-crystalline or intra-crystalline) in addition to unique properties that are often characteristic of the specific synthetic route. In this work, hierarchical beta zeolites with similar Si/Al ratios are obtained by a top-down hydrothermal desilication and a bottom-up organosilane-templated synthesis using both commercial and custom designed organosilanes. It is identified that the typically destructive nature of desilication can be offset by inducing recrystallization under hydrothermal conditions, while the organosilane soft-template route shows a disruptive effect where microporosity needs be sacrificed in order to obtain additional mesoporosity, a feature that is commonly associated with the top-down approach. The distinctive structural and porous features of these zeolites are presented, and their catalytic performances evaluated by the cracking of cumene and 1,3,5-triisopropylbenzene. The effect of mesopore configuration on catalytic activity and the merits (or lack thereof) of mesoporosity in improving catalytic performances will be discussed. The catalytic results demonstrate that a combination of intracrystalline mesoporosity and high crystallinity are necessary to achieve optimal performance for hydrocarbon cracking.

中文翻译：

通过水热脱硅和有机硅烷模板合成探索合成策略对分级β沸石催化裂化的影响

可以通过不同的策略合成分层沸石（例如自上而下或自下而上），除了具有通常是特定合成路线的特征的独特特性外，还导致具有不同构型（晶体间或晶体内）的介孔性的产生。在这项工作中，使用商业和定制设计的有机硅烷通过自上而下的水热脱硅和自下而上的有机硅烷为模板的合成，获得了具有相似Si / Al比的分级β沸石。可以确定的是，通常可以通过在水热条件下诱导重结晶来抵消典型的破坏性性质，而有机硅烷软模板路径则显示出破坏性的效果，其中需要牺牲微孔性以获得额外的中孔性，这种特性通常与自上而下的方法。介绍了这些沸石的独特结构和多孔特征，并通过枯烯和1,3,5-三异丙基苯的裂解评价了它们的催化性能。将讨论介孔构型对催化活性的影响以及介孔性能在改善催化性能方面的优点（或缺乏优点）。催化结果表明，晶内介孔性和高结晶度的组合对于实现烃裂化的最佳性能是必要的。

更新日期：2020-07-21

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