SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (10): 2070-2076.DOI: 10.1016/j.cjche.2018.03.030

• Catalysis, Kinetics and Reaction Engineering • 上一篇    下一篇

Optimization of conditions for preparation of ZSM-5@silicalite-1 core-shell catalysts via hydrothermal synthesis

Chuang Liu, Yihua Long, Zhengbao Wang   

  1. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2018-02-05 修回日期:2018-03-25 出版日期:2018-10-28 发布日期:2018-11-14
  • 通讯作者: Zhengbao Wang,E-mail address:zbwang@zju.edu.cn
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21676238).

Optimization of conditions for preparation of ZSM-5@silicalite-1 core-shell catalysts via hydrothermal synthesis

Chuang Liu, Yihua Long, Zhengbao Wang   

  1. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2018-02-05 Revised:2018-03-25 Online:2018-10-28 Published:2018-11-14
  • Contact: Zhengbao Wang,E-mail address:zbwang@zju.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China (21676238).

摘要: Although the preparation of ZSM-5@silicalite-1 (ZS) core-shell catalysts has been reported in the literature, their selectivity to para-xylene (PX) in the toluene alkylation with methanol is difficult to control. Here we present the effects of water and ZSM-5 adding amounts in the synthesis solution, the hydrothermal synthesis time, and the Si/Al ratio of core ZSM-5 on the catalytic performance of ZS core-shell catalysts. The ZS core-shell catalysts were characterized by X-ray diffraction (XRD), N2 adsorption, and NH3 temperature-programmed desorption (NH3-TPD) techniques. The highest PX selectivity of 95.5% was obtained for the ZS (Si/Al=140) catalyst prepared in the synthesis solution with a molar ratio of 0.2TPAOH:1TEOS:250H2O at 175℃ and 10 r·min-1 for only 2 h and the corresponding toluene conversion is as high as 22.8% for the alkylation of toluene with methanol.

关键词: ZSM-5, Silicalite-1, Core-shell catalyst, Alkylation, Para-selectivity

Abstract: Although the preparation of ZSM-5@silicalite-1 (ZS) core-shell catalysts has been reported in the literature, their selectivity to para-xylene (PX) in the toluene alkylation with methanol is difficult to control. Here we present the effects of water and ZSM-5 adding amounts in the synthesis solution, the hydrothermal synthesis time, and the Si/Al ratio of core ZSM-5 on the catalytic performance of ZS core-shell catalysts. The ZS core-shell catalysts were characterized by X-ray diffraction (XRD), N2 adsorption, and NH3 temperature-programmed desorption (NH3-TPD) techniques. The highest PX selectivity of 95.5% was obtained for the ZS (Si/Al=140) catalyst prepared in the synthesis solution with a molar ratio of 0.2TPAOH:1TEOS:250H2O at 175℃ and 10 r·min-1 for only 2 h and the corresponding toluene conversion is as high as 22.8% for the alkylation of toluene with methanol.

Key words: ZSM-5, Silicalite-1, Core-shell catalyst, Alkylation, Para-selectivity