期刊
NEW JOURNAL OF CHEMISTRY
卷 38, 期 9, 页码 4380-4387出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nj00756e
关键词
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资金
- National Natural Science Foundation of China [20936001, 21176084]
- National High Technology Research and Development Program of China [2013AA065005]
- SRFDP [20130172110012]
- Guangdong Natural Science Foundation [S2011 030001366]
The hierarchical zeolite with MFI nanosheet frameworks was directly prepared under hydrothermal synthesis conditions using a series of tetra-headgroup rigid bolaform quaternary ammonium surfactants, where the bolaform surfactants act as dual structure-directing functions on two different length scales (micro- and mesoporous) simultaneously. The MFI zeolite nanosheets were characterized by a complementary combination of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption isotherms, Fourier transform infrared spectroscopy, Al-27 MAS NMR spectroscopy, thermogravimetric analysis and density functional theory calculations. The results suggested that the hydrophilic headgroups caused the aluminosilicate species to form MFI zeolite-like frameworks while the surfactant linkers with a rigid biphenol group directed MFI nanosheet layers into an ordered multilamellar mesostructure. The morphologies and textural properties of MFI zeolite nanosheets could be controlled with different surfactants. Since the synthesis of MFI zeolite nanosheets has great potential for industrial applications, our synthesis approach can be expected to be extended to other types of zeolites in order to improve their performance in targeted catalytic reactions.
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