文献类型：期刊文献

英文题名：Catalytic performance and characterization of Al₂O₃-supported Pt-Co catalyst coatings for preferential CO oxidation in a micro-reactor

作者：Li, Hongliang[1];Yu, Xinhai[1];Tu, Shan-Tung[1];Yan, Jinyue[2,3];Wang, Zhengdong[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Malardalen Univ, Sch Sustainable Dev Soc & Technol, SE-72123 Vasteras, Sweden;[3]Royal Inst Technol, Sch Chem Sci & Engn, SE-10044 Stockholm, Sweden

年份：2010

卷号：387

期号：1-2

起止页码：215

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000283618100027)】；

基金：This study was financially supported by the Swedish Research Links Programme of the Swedish Research Council (VR) and the Chinese Natural Science Foundation (Contract Nos. 20606011 and 50772036). The authors would also like to thank Prof. Weiling Luan and Erik Dahlquist for TEM analysis and other useful suggestions.

语种：英文

外文关键词：Preferential oxidation; Catalyst coating; Hydrogen purification; Carbon monoxide oxidation; Pt3Co intermetallic compound

摘要：Platinum-cobalt (Pt-Co) catalyst coatings are studied for preferential oxidation of carbon monoxide (PROX) ill hydrogen-rich gas streams. Experimental results show a role for cobalt in improving catalytic activity. The most active catalyst coating can decrease carbon monoxide concentrations from 1% to a value of less than 10 ppm for GHSV values ranging from 40,000 to 120,000 ml g(-1) h(-1). This catalyst coating can work at a wide window of operation ill terms of temperature. Transmission electron microscopy, selected-area electron diffraction, and diffuse reflectance infrared Fourier transform spectroscopy show that the addition of Co forms Pt3Co intermetallic compounds and slightly increases the average particle size. In situ laser Raman spectroscopy reveals the co-existence of Co metal and its oxides on the catalyst surface, due to gradual oxidation of Co by gas phase oxygen within the initial stage of the PROX reaction. The promotional effect of Co during PROX is confirmed and ascribed to this Pt3Co intermetallic compound and the synergetic effect of Co-0 and Co chi+. The high accessibility of the reactant to Pt3Co species appears favorable and crucial for PROX. (C) 2010 Elsevier B.V. All rights reserved.