期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 20, 期 36, 页码 11511-11521出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201402665
关键词
mesoporous materials; nanostructures; solid acid catalysts; structure-directing agents; zeolites
资金
- DST [SB/S1/PC-91/2012]
- CSIR, New Delhi
A new series of multiquaternary ammonium structure-directing agents, based on 1,4-diazabicyclo[2.2.2] octane, was prepared. ZSM-5 zeolites with nanosheet morphology (10 nm crystal thickness) were synthesized under hydrothermal conditions using multiquaternary ammonium surfactants as the zeolite structure-generating agents. Both wideangle and small-angle diffraction patterns were obtained using only a suitable structure-directing agent under a specific zeolite synthesis composition. A mechanism of zeolite formation is proposed based on the results obtained from various physicochemical characterizations. ZSM-5 materials were investigated in catalytic reactions requiring medium to strong acidity, which are important for the synthesis of a wide range of industrially important fine and specialty chemicals. The catalytic activity of ZSM-5 materials was compared with that of the conventional ZSM-5 and amorphous mesoporous aluminosilicate Al-MCM-41. The synthesis strategy of the present investigation using the new series of structure-directing agents could be extended for the synthesis of other related zeolites or other porous materials in the future. Zeolite with a structural feature as small as the size of a unit cell (5-10 nm) with hierarchically ordered porous structure would be very promising for catalysis.
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