文献类型：期刊文献

英文题名：Catalytic performance and characterization of Al2O 3-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] School of Mechanical and Power Engineering, East China University of Science and Technology, Meilong Road 130, 200237 Shanghai, China; [2] School of Sustainable Development of Society and Technology, M?lardalen University, SE-721 23 V?ster?, Sweden; [3] School of Chemical Science and Engineering, Royal Institute of Technology, Stockholm, SE-100 44 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：EI(收录号：20104613383085)

语种：英文

外文关键词：High resolution transmission electron microscopy - Intermetallics - Carbon monoxide - Catalyst activity - Electron diffraction - Alumina - Aluminum oxide - Coatings - Cobalt compounds - Fourier transform infrared spectroscopy - Catalytic oxidation - Cobalt alloys - Hydrogen - Particle size

摘要：Platinum-cobalt (Pt-Co) catalyst coatings are studied for preferential oxidation of carbon monoxide (PROX) in 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 in 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 Co0 and Cox+. The high accessibility of the reactant to Pt3Co species appears favorable and crucial for PROX. ? 2010 Elsevier B.V. All rights reserved.