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

Abstract

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

Li Jieming, Jiang Dazhen, Fan Shuguang, Sun Zhongqi . Acidity of (CH₃)₃SiCl-Modified ZSM-5 Zeolite and Its Catalysis in Toluene Disproportionation Reaction[J]. Chemical Research in Chinese Universities, 1988, 4(2): 72-80.

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

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