Facile synthesis of mesoporous aluminosilicates constructed with crystalline microporous frameworks
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- 作者：Baoyu Liu liubaoyu084@163.com ; Yanqun Ren ; Qianqian Duan ; Fei Chen ; Hongxia Xi ; cehxxi@scut.edu.cn ; Yu Qian
- 关键词：Hierarchical structure ; ZSM-5 ; Quantum chemical calculation ; Surfactant
- 刊名：Applied Surface Science
- 出版年：2013
- 出版时间：15 August, 2013
- 年：2013
- 卷：279
- 期：Complete
- 页码：55-61
- 全文大小：2099 K
文摘
A hierarchically micro-mesoporous structured ZSM-5 zeolite has been synthesized from assembly of aluminosilcate species with a tetra-quaternary ammonium type surfactant, in which the surfactant acts as two-level structure-directing templates for generating micropores and mesopores simultaneously. The synthesized samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption-desorption isotherms, scanning electron microscopy, transmission electron microscopy, 27Al magic angle spinning nuclear magnetic resonance, X-ray photoelectron spectroscopy, Thermogravimetric analysis and Quantum chemical calculation. X-ray diffraction as well as nitrogen sorption analyses indicated the dual-porosity of samples, one is from intra-crystalline micropores, and the other is from mesopores. Quantum chemical calculation results showed that the inner ammonium groups of surfactant had more higher molecular degrees of freedom for the zeolite-structure-directing function. Moreover, on the basis of the same concept, this method could be extended to investigate other hierarchically structured zeolites.