Influences of Zn on Active State of Sn in Pt-Sn/γ-Al2O3 Catalysts and Propane Dehydrogenation

Chem. J. Chinese Universities

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Influences of Zn on Active State of Sn in Pt-Sn/γ-Al₂O₃ Catalysts and Propane Dehydrogenation

YU Chang-Lin^1,2, XU Heng-Yong¹, GE Qing-Jie¹, LI Wen-Zhao¹

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

Received:2005-09-02 Revised:1900-01-01 Online:2006-08-10 Published:2006-08-10
Contact: XU Heng-Yong

Abstract

Abstract: The effect of Zn addition to Pt-Sn/γ-Al₂O₃ 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-Al₂O₃ catalyst can greatly improve the performance of Pt-Sn/γ-Al₂O₃ 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(H₂-TPR) and temperature-programmed electronic conductivity(TPEC) show that the addition of Zn to Pt-Sn/γ-Al₂O₃ 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-Al₂O₃ catalyst in dehydrogenation.

Key words: Propane, Dehydrogenation, Zinc, Platinum and tin, Temperature-programmed reduction, Temperature-programmed electronic conductivity

CLC Number:

O643

TrendMD:

YU Chang-Lin^1,2, XU Heng-Yong¹, GE Qing-Jie¹, LI Wen-Zhao¹. Influences of Zn on Active State of Sn in Pt-Sn/γ-Al₂O₃ Catalysts and Propane Dehydrogenation[J]. Chem. J. Chinese Universities, doi: .

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Influences of Zn on Active State of Sn in Pt-Sn/γ-Al₂O₃ Catalysts and Propane Dehydrogenation

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