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《Journal of Central China Normal University(Natural Sciences)》 2004-02
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Effect of silicon on the acidic property of γ-Al_2O_3 and catalytic properties of alumina-supported Pt- and Pd-catalysts for benzene hydrogenation

LI Wu-ke, CHEN Ping-chu, WANG Ming, WANG Jun-tao, LIU Wan-qiao, HAO Xiao (College of Chemistry, Central China Normal University, Wuhan 430079)  
Silicon was introduced to modify the γ-Al_2O_3 carriers by impregnation methods. The effects of Si on the carriers were studied by means of NH_3-TPD, IR, Hammett indicator methods, dehydration of N-butanol, TG and DTA. The results indicated that the incorporated Si acted on the γ-Al_2O_3 to form new bond of Al-O-Si and that the total amounts of acid sites and the acid strength on the surface of γ-Al_2O_3 increased with the amount of introduced Si. Furthermore, Pt-and Pd-containing mono-metal supported catalysts were prepared by impregnation method with the γ-Al_2O_3 carrier modified by Si. The influences of Si on the catalytic activities were investigated by the micro-catalytic pulse chromatogram technology with the benzene hydrogenation as the probe. Experimental results revealed that the modification of carrier can increase the catalytic activity of benzene hydrogenation and decrease the activation energy of hydrogenation reaction. What's more, the results also showed that the influences of Si include the electronic effect and steric effect, whereas the electronic effect seemed to be principal.
【CateGory Index】: O643.3
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