Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (10): 1727-1739.DOI: 10.1016/S1872-2067(14)60128-5

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Synthesis of mesoporous ZSM-5 using a new gemini surfactant as a mesoporous directing agent:A crystallization transformation process

Quanyi Wanga,b,e, Yingxu Weia, Shutao Xua, Mozhi Zhanga,e, Shuanghe Menga, Dong Fana,e, Yue Qia, Jinzhe Lia, Zhengxi Yua, Cuiyu Yuana, Yanli Hea, Shuliang Xua, Jingrun Chena,e, Jinbang Wanga, baolian Sub,c, Zhongmin Liua,d   

  1. a Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b Laboratory of Inorganic Materials Chemistry (CMI), University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium;
    c State key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China;
    d State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    e University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-04-09 Revised:2014-05-28 Online:2014-09-28 Published:2014-09-30
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21273230, 21273005, 21103176, 21103180).

Abstract:

A new gemini surfactant, [C18H37(CH3)2-N+-(CH2)3-N+-(CH3)2C18H37]Cl2 (C18-3-18), has been successfully used as the mesopore directing agent in the hydrothermal synthesis of mesoporous ZSM-5 (MZSM-5). The synthesis of MZSM-5 was realized with a low temperature crystallization process at 130 ℃. The amount of C18-3-18 used in the synthesis affected the relative crystallinity and the textural properties of the obtained MZSM-5. Detailed investigation showed that the formation of MZSM-5 followed a crystallization transformation process. The use of C18-3-18 resulted in the formation of mesoporous material during the early stage of the synthesis, which was converted into MZSM-5 crystals templated by tetrapropylammonium bromide to form the MFI phase. As the synthesis proceeded, the MZSM-5 crystals aggregated into particles by weak interactions. This work shows that C18-3-18 can be used as a mesopore directing agent, which could provide a route for the synthesis of other mesoporous zeolites.

Key words: Mesoporous ZSM-5, Dual-templating, Gemini surfactant, Inter-crystalline mesopore, Crystallization transformation