Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (6): 866-873.DOI: 10.1016/S1872-2067(14)60263-1

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One-pot synthesis of hierarchically structured ZSM-5 zeolites using single micropore-template

Tongguang Ge, Zile Hua, Xiaoyun He, Yan Zhu, Wenchao Ren, Lisong Chen, Lingxia Zhang, Hangrong Chen, Chucheng Lin, Heliang Yao, Jianlin Shi   

  1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2014-10-30 Revised:2014-12-10 Online:2015-05-21 Published:2015-05-21
  • Supported by:

    This work was supported by the National Basic Research Program of China (2013CB933200), the National High Technology Research and Development Program of China (2012AA062703), China National Funds for Distinguished Young Scientists (51225202), and the Opening Projects of State Key Laboratory of Heavy Oil Processing (SKLOP201402003).

Abstract:

An easy one-step hydrothermal process has been developed for the first time for the synthesis of hierarchically structured zeolites (HSZs) using a single micropore template of tetrapropylammonium hydroxide. Compared with conventional constructive dual-templating synthesis and destructive post-demetallation methods, this two-in-one process reduces the mass of porogens required and consequent air pollution by combustion of the template, and simplifies the synthesis. The resultant HSZs were characterized by X-ray diffraction, N2 adsorption, scanning electron microscopy, transmission electron microscopy, X-ray fluorescence, 27Al nuclear magnetic resonance, and NH3 temperature programmed desorption. The resultant HSZs with uniform shuttle-type morphology showed high hydrothermal stability and excellent catalytic activity with prolonged life-time in the model reaction of 1,3,5- triisopropylbenzene cracking. A "nucleation/growth-demetallation/recrystallization" mechanism was proposed, which is featured with the integration of zeolite crystallization/growth and basic etching into one hydrothermal process for HSZs production.

Key words: Hierarchically structured zeolite, ZSM-5, Single template, Base etching, Catalysis