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

被引：53
|
作者：
Deng, Lidan [1 ]
Miura, Hiroki [2 ,3 ]
Shishido, Tetsuya [2 ,3 ]
Hosokawa, Saburo [1 ,3 ]
Teramura, Kentaro [1 ,3 ,4 ]
Tanaka, Tsunehiro [1 ,3 ]
机构：
[1] Kyoto Univ, Grad Sch Engn, Dept Mol Engn, Nishikyo Ku, Kyoto 6158510, Japan
[2] Tokyo Metropolitan Univ, Grad Sch Urban Environm Sci, Dept Appl Chem, Hachioji, Tokyo 1920397, Japan
[3] Kyoto Univ, ESICB, Nishikyo Ku, Kyoto 6158245, Japan
[4] Japan Sci & Technol Agcy JST, Precursory Res Embryon Sci & Technol PRESTO, Kawaguchi, Saitama 3320012, Japan
来源：
CHEMCATCHEM | 2014年 / 6卷 / 09期
基金：
日本科学技术振兴机构;
关键词：
alloys; dehydrogenation; platinum; reduction; tin; X-RAY-ABSORPTION; ALLOY NANOPARTICLES; PT-SN; COLLOIDAL SYNTHESIS; STRUCTURAL CONTROL; LIGHT OLEFINS; TRANSFORMATION; OXIDATION; CRACKING; PT(111);
D O I：
10.1002/cctc.201402306
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：2680 / 2691
页数：12
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