Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (07): 1297-1301.doi: 10.3866/PKU.WHXB20080730

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Catalytic Properties of PtSn/Al2O3/MCM-41 Catalysts for Propane Dehydrogenation

HUANG Li-Hua; YANG Li-Li; XU Bo-Lian; FAN Yi-Ning   

  1. Jiangsu Provincial Key Laboratory of Nanotechnology, Key Laboratory of Mesoscopic Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
  • Received:2008-01-25 Revised:2008-04-08 Published:2008-07-04
  • Contact: FAN Yi-Ning

Abstract: The catalytic properties of PtSn/γ-Al2O3, PtSn/MCM-41 and PtSn/Al2O3/MCM-41 catalysts for propane dehydrogenation were studied using microreactor tests combined with X-ray diffraction (XRD), BET surface area and pore structure measurements, temperature-programmed reduction (TPR), H2-chemisorption and thermogravimetric (TG) analysis. It was shown that the PtSn catalysts supported on Al2O3-modified MCM-41 (Al2O3/MCM-41) exhibited higher activity than the PtSn/MCM-41 catalyst, and higher catalytic stability than the conventional PtSn/γ-Al2O3 catalyst for propane dehydrogenation. The characterization results of the catalysts revealed that on the surface of pure MCM-41, the dispersed Sn species were easier to be reduced to metallic state due to weak interaction of Sn with MCM-41 support, resulting in lower Pt dispersity and thus lower catalytic activity. In contrast, modifying the surface of MCM-41 by alumina could enhance the interaction between Sn and Al2O3/MCM-41 support, and increase Pt dispersity and catalytic activity for propane dehydrogenation. Moreover, the PtSn/Al2O3/MCM-41 catalysts had larger bare fraction of Pt surface after coke deposition, leading to their higher catalytic stability than the PtSn/γ-Al2O3 catalyst. It is suggested that the unique catalytic properties of PtSn/Al2O3/MCM-41 catalysts are correlated not only to the strong interaction of Sn with Al2O3/MCM-41support but also to the mesoporous structure of the Al2O3/MCM-41 support.

Key words: Pt, Sn, MCM-41, Al2O3, Propane dehydrogenation


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