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《Chemical Journal of Chinese Universities》 2006-08
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Influences of Zn on Active State of Sn in Pt-Sn/γ-Al_2O_3 Catalysts and Propane Dehydrogenation

YU Chang-Lin~1,2,XU Heng-Yong~1*,GE Qing-Jie~1,LI Wen-Zhao~1(1.The Laboratory of Natural Gas Utilization and Applied Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China)  
The effect of Zn addition to Pt-Sn/γAl_2O_3 catalyst on the activity and selectivity in the reaction of propane dehydrogenation was studied.The results show that the addition of Zn to Pt-Sn/γ-Al_2O_3 catalyst can greatly improve the performance of Pt-Sn/γ-Al_2O_3 for propane dehydrogenation.The initial conversion of propane increased from 34% to 42% and initial selectivity to propene increased from 80% to 98%.At the same time,the presence of Zn greatly reduced the deactivation rate.The studies of temperature-programmed reduction of hydrogen(H_2-TPR) and temperature-programmed electronic conductivity(TPEC) show that the addition of Zn to Pt-Sn/γ-Al_2O_3 made the reduction of Sn become more difficult.This may suggest that the presence of Zn can stabilize tin promoter in an active oxidation state and prevent the formation of PtSn alloy in strong reduction atmosphere,which may be responsible for the high stability and selectivity for Pt-Zn-Sn/γ-Al_2O_3 catalyst in dehydrogenation.
【CateGory Index】: O643.32
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