Dehydrogenation of Propane over Silica-Supported Platinum-Tin Catalysts Prepared by Direct Reduction: Effects of Tin/Platinum Ratio and Reduction Temperature

作者：Deng Lidan; Miura Hiroki; Shishido Tetsuya^*; Hosokawa Saburo; Teramura Kentaro; Tanaka Tsunehiro

来源：ChemCatChem, 2014, 6(9): 2680-2691.

DOI：10.1002/cctc.201402306

• alloys
• dehydrogenation
• platinum
• reduction
• tin

A series of Pt-Sn/SiO2 catalysts with different Sn/Pt atomic ratios (1/3-3) were prepared by a direct reduction method and tested for the dehydrogenation of propane to propylene. Structural characterization by XRD, TEM, CO adsorption, X-ray photoelectron spectroscopy, and X-ray absorption fine structure analysis revealed that the Pt-Sn/SiO2 catalysts possessed a highly dispersed Pt-Sn alloy core with a Sn-rich surface regardless of the Sn/Pt ratio or reduction temperature. Highly dispersed SnO2 coexisted with the Pt-Sn alloy particles, and part of the Pt-Sn alloy surface was covered with SnO2. Among the catalysts prepared, 1Pt1Sn/SiO2_1073K (Sn/Pt ratio=1, reduced at 1073K), composed of Pt3Sn alloy with a small fraction of Pt-Sn alloy, exhibited the highest activity. In contrast, if the Sn/Pt ratio was larger than 1 and/or the reduction temperature was 1273K, Pt-Sn alloy was observed mainly and the Pt-Sn/SiO2 catalysts showed low activity.

• 出版日期2014-9