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A Topotactic Synthetic Methodology for the Synthesis of Nanosized MFI Zeolites with Hierarchical Structures
Author(s) -
Li Ang,
Wang Xue,
Wang Tao,
Liu Huali,
Gao Tunan,
Fan Meihong,
Huo Qisheng,
Qiao ZhenAn
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201801185
Subject(s) - nanoreactor , catalysis , zeolite , materials science , nanotechnology , template , nanoparticle , hydrothermal synthesis , chemical engineering , hydrothermal circulation , hydroxide , chemistry , organic chemistry , engineering
Much effort has been invested in the designed synthesis of zeolites with nanosized and hierarchical structures in recent decades, on account of increasing demands in practical applications, especially catalysis. Herein, a new topotactic synthetic strategy is demonstrated to synthesize nanosized and hierarchical zeolites in a one‐step procedure. By using silica spheres as the adjustable amorphous precursors and tetrapropylammonium hydroxide as a structure‐directing agent, effortless control of both size and porosity can be achieved in this system with no extra templates. With a simple hydrothermal process, hierarchical zeolite spheres can be modified with acid cites (Al species incorporated in the framework). Benefitting from its mesoporosity, palladium nanoparticles are incorporated into the nanosized hierarchical zeolite, which makes the materials suitable for use in a cascade catalysis reaction of benzimidazole derivatives, including independent acid catalysis and hydrogenation sites. The nanocomposites show exceptional activity and stability in catalysis and recycling reaction. This strategy can be developed into other versatile and practicable scaffolds for advanced zeolite catalytic nanoreactor systems.