Journal of Inorganic Materials ›› 2015, Vol. 30 ›› Issue (11): 1161-1166.DOI: 10.15541/jim20150171

• Orginal Article • Previous Articles     Next Articles

Synthesis of Monolith Hierachical ZSM-5 Zeolite Composed of Nanocrystals by Vapor-phase Transformation Method

ZHENG Jia-Jun, ZHANG Hong-Yan, PAN Meng, LI Biao, ZHANG Qiu, KONG Qing-Lan, LIU Zhi-Ping, LI Rui-Feng   

  1. (Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China)
  • Received:2015-04-08 Revised:2015-05-14 Published:2015-11-20 Online:2015-10-20
  • Supported by:
    Joint Funds of the National Natural Science Foundation of China-China Petroleum and Chemical Corporation (State Key Program.U1463209);National Natural Science Foundation of China (21371129;21376157;51272169)


A monolith ZSM-5 composed of nano-sized MFI crystals was prepared from a dry gel by a vapor-phase transformation method, in which the dry gel was obtained from a mixture of sodium carboxymethylcellulose and a precursor yielding ZSM-5 zeolite crystals. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), N2 adsorption-desorption, in-situ IR spectra of pyridine and FT-IR. Organic Si- or/and Al-species replace the classic inorganic Si- or/and Al-species to take part in the construction of MFI zeolite frameworks. And the long chain organic groups, which connect with the Si- and Al-species, disturb the normal growth of the zeolites crystals in the manner of the so called “bond block”. The evenly nano-sized zeolite crystals with the sizes of 100-150 nm are therefore formed and then subsequently self-assembly form a monolith ZSM-5. A mesoporous system which centers around 2-20 nm is therefore introduced into the as-synthesized hierachical zeolites samples. As compared with the references catalysts, the monolith ZSM-5 zeolite composed of nano-sized crystals displays an enhanced conversion of isopropylbenzene because of the dramatically increased external surface areas and mesopores volume as tested by the catalytic cracking of isopropylbenzene.

Key words: ZSM-5, vapor-phase transformation, nano-zeolite, hierachical pores, bond block

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