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高等学校化学研究 ›› 1988, Vol. 4 ›› Issue (2): 72-80.

• Articles • 上一篇    下一篇

Acidity of (CH3)3SiCl-Modified ZSM-5 Zeolite and Its Catalysis in Toluene Disproportionation Reaction

Li Jieming, Jiang Dazhen, Fan Shuguang, Sun Zhongqi   

  1. Department of Chemistry, Jilin University, Changchun
  • 收稿日期:1987-10-27 出版日期:1988-04-24 发布日期:2011-09-09

Acidity of (CH3)3SiCl-Modified ZSM-5 Zeolite and Its Catalysis in Toluene Disproportionation Reaction

Li Jieming, Jiang Dazhen, Fan Shuguang, Sun Zhongqi   

  1. Department of Chemistry, Jilin University, Changchun
  • Received:1987-10-27 Online:1988-04-24 Published:2011-09-09

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摘要： HZSM-5 zeolites modified by Si(CH3)3 Cl were studied by TPD, IK and 27Al NMR to characterize their surface properties and bycatalytic reaction of toluene disproportionation.It was found that the concentration of the stronger Bronsted acid sites were decreased and the stronger Lewis acid sites were increased after modifieation with Si(CH3)3Cl. The TPD peaks of NH3, presumally attributed to stronger acid sites (peak Ⅱ ) were decreased by the deposition of Si(CH3)3 Cl on the surface of the zeolites.The selectivity to the para xylene can be attained not only by controlling the pore opening and channels of the zeolite, hut also by changing the concentration of the stronger acid sites and the acidic type on the surface of the zeolite.

关键词: HZSM-5 zeolites, Surface acidity, catalysis

Abstract: HZSM-5 zeolites modified by Si(CH3)3 Cl were studied by TPD, IK and 27Al NMR to characterize their surface properties and bycatalytic reaction of toluene disproportionation.It was found that the concentration of the stronger Bronsted acid sites were decreased and the stronger Lewis acid sites were increased after modifieation with Si(CH3)3Cl. The TPD peaks of NH3, presumally attributed to stronger acid sites (peak Ⅱ ) were decreased by the deposition of Si(CH3)3 Cl on the surface of the zeolites.The selectivity to the para xylene can be attained not only by controlling the pore opening and channels of the zeolite, hut also by changing the concentration of the stronger acid sites and the acidic type on the surface of the zeolite.

Key words: HZSM-5 zeolites, Surface acidity, catalysis