Constructing Hierarchical Zeolites with Highly Complete Framework via Controlled Desilication.
Angew Chem Int Ed Engl
; : e202411446, 2024 Aug 22.
Article
in En
| MEDLINE
| ID: mdl-39175170
ABSTRACT
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.
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01-internacional
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MEDLINE
Language:
En
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Angew Chem Int Ed Engl
Year:
2024
Document type:
Article
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