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- W2119010140 abstract "High aluminum content constitutes a major hurdle for the postsynthesis modification of hierarchical zeolites. A facile protocol comprising fluorination and sequential alkaline treatment is presented for the postsynthesis modification of hierarchical Al-rich MFI zeolites. By virtue of this protocol, uniform intracrystalline mesoporosity is introduced in an Al-rich MFI zeolite (Si/Al = 14.3). The obtained hierarchical zeolites exhibit a significant mesopore size distribution, centered around 6 nm, and show improved conversions in catalytic cracking of bulky aromatic molecules. The fundamental implications of the fluorination-alkaline treatment protocol are related to the formation of F-bearing tetrahedral aluminum species in the antecedent fluorination step, which alleviates the resistance of Al sites to the alkaline medium and causes Al-F complexation for regulated hydrolysis of the Al species during the alkaline treatment process. This top-down protocol and the derived mechanistic understandings are expected to be applied in the synthesis of hierarchical Al-rich zeolites with other framework topologies." @default.
- W2119010140 created "2016-06-24" @default.
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- W2119010140 date "2014-11-14" @default.
- W2119010140 modified "2023-10-10" @default.
- W2119010140 title "A Facile Top-Down Protocol for Postsynthesis Modification of Hierarchical Aluminum-Rich MFI Zeolites" @default.
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- W2119010140 doi "https://doi.org/10.1002/chem.201404817" @default.
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