Desilication in alkaline medium has been widely used in construction of hierarchical zeolites for industrially relevant catalytic processes. The built of hierarchy in zeolites, especially with low aluminum stability or high Si/Al ratio, often suffers from uncontrolled destruction of zeolitic framework, accompanied by a significant loss of microporous domains and intrinsic acidity after desilication. Here, we report a novel and simple methodology for preparation of hierarchical zeolites with highly complete framework and minimum sacrifice of microporosity and acidity. The pre‐impregnated amines in zeolite micropores act as inner pore‐directing agents (iPDAs), largely protecting the zeolitic framework and moderating the silicon extraction during the alkaline treatment. The resulting hierarchical zeolites exhibit high crystallinity, tunable hierarchy, stable framework, and well‐preserved acidity, endowing them with significantly improved mass transport properties and enhanced activities in catalytic conversion of methanol or furfural.

中文翻译：

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可控脱硅构建骨架高度完整的多级孔沸石


碱性介质中的脱硅已广泛用于构建工业相关催化过程的分级沸石。沸石的分级结构，尤其是铝稳定性低或硅铝比高的沸石，经常遭受沸石骨架不受控制的破坏，并伴随着脱硅后微孔域和固有酸性的显着损失。在这里，我们报告了一种新颖而简单的方法来制备具有高度完整的骨架和最小的微孔率和酸度牺牲的分级沸石。沸石微孔中的预浸渍胺充当内孔导向剂（iPDA），在很大程度上保护沸石骨架并调节碱处理过程中的硅萃取。所得的分级沸石表现出高结晶度、可调的分级结构、稳定的骨架和良好的酸性，使其具有显着改善的传质性能和增强的甲醇或糠醛催化转化活性。