文献类型：期刊文献

英文题名：High Performance and Stability of the Pt-W/ZSM-5 Catalyst for the Total Oxidation of Propane: The Role of Tungsten

作者：Zhu, Zengzan[1];Lu, Guanzhong[1];Guo, Yun[1];Guo, Yanglong[1];Zhang, Zhigang[1];Wang, Yanqin[1];Gong, Xue-Qing[1]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2013

卷号：5

期号：8

起止页码：2495

外文期刊名：CHEMCATCHEM

收录：;EI(收录号：20133216583960);WOS:【SCI-EXPANDED(收录号:WOS:000322240600058)】；

基金：We acknowledge the financial support from the National Basic Research Program of China (2010CB732300 and 2013CB933201), the National Natural Science Foundation of China (21171055), the National High Technology Research and Development Program of China (2011AA03A406), the "Shu Guang" Project (10GG23) of Shanghai Municipal Education Commission and Shanghai Education, and the Development Foundation of the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：oxidation; porous materials; platinum; tungsten; ZSM-5

摘要：Tungsten-modified 1.5wt.%platinum supported on ZSM-5 catalysts were prepared, and their performances for the total oxidation of propane and the role of tungsten in the catalysts were investigated. The results show that the addition of tungsten can improve the catalytic activity of Pt/ZSM-5. When the tungsten loading is 5 wt. %, the Pt-5W/ZSM-5 catalyst demonstrates excellent catalytic activity and its turnover frequency is more than 1 order of magnitude higher than that of the Pt/ZSM-5 catalyst. Analyses of the surface properties of catalysts reveal that metallic platinum is scarcely found on the Pt/ZSM-5 catalyst without tungsten; the addition of tungsten can modify the nature of platinum species, which results in the presence of metallic platinum in the Pt-W/ZSM-5 catalyst. The amount of metallic platinum in the Pt-W/ZSM-5 catalyst depends on the tungsten loading and can correlate directly with its catalytic activity. Therefore, the oxidation resistance of platinum in the Pt-W/ZSM-5 catalyst seems to be responsible for the improved catalytic activity in propane oxidation. In addition, the Pt-5W/ZSM-5 catalyst demonstrates higher stability; no deactivation of the Pt-W/ZSM-5 catalyst is observed after the online test for 50 h, with the temperature alternating between 200 degrees C for 10 h and 500 degrees C for 10 h. Therefore, the Pt-5W/ZSM-5 catalyst demonstrates better catalytic activity for propane oxidation than the Pt/ZSM-5 catalyst after online aging at 700 degrees C for 30 h.