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Effect of samarium and praseodymium addition on water gas shift performance of Co/CeO2 catalysts
Affiliation:1. Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathumthani, 12120, Thailand;2. The Joint Graduate School of Energy and Environment, King Mongkut''s University of Technology Thonburi, Bangkok, 10140, Thailand;3. National Metal and Materials Technology Center, NSTDA, Pathumthani, 12120, Thailand;1. College of Resources and Environment, Zunyi Normal University, Zunyi 563006, China;2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, M3H 5T4, Canada;5. College of Chemical Engineering, Huaqiao University, Xiamen 361021, China;1. Department of Biology, Taiyuan Normal University, Jinzhong 030619, China;2. Department of Chemistry, Taiyuan Normal University, Jinzhong 030619, China;3. Department of Chemistry, Tianjin University, Tianjin 300072, China;4. School of Science, Tianjin University of Science & Technology, Tianjin 300457, China;5. College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China;1. National Engineering Research Center for Rare Earth Materials, GRINM Group Co., Ltd., Beijing 100088, China;2. Grirem Advanced Materials Co., Ltd., Beijing 100088, China;3. General Research Institute for Nonferrous Metals, Beijing 100088, China;4. School of Metallurgy, Northeastern University, Shenyang 110819, China;1. College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China;2. Department of Physics and Electronic Information Engineering, Minjiang University, Fuzhou 350121, China;3. Fujian Provincial Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen 361005, China;1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;2. State Power Environmental Protection Research Institute, Nanjing 210031, China
Abstract:The performance of Co supported over ceria and doped ceria (by Sm and Pr) catalysts towards the water gas shift reaction was studied for the removal of CO from syngas to produce high purity hydrogen for a fuel cell application. It is found that 1%Co/Ce-5%Sm-O yields the highest catalytic performance towards this reaction compared with undoped-Sm and doped-Pr. An addition of Sm onto ceria support reveals a small crystallite size with high surface area and well dispersed cobalt on ceria surface. Moreover, a presence of Sm increases the reducibility of cobalt species and surface oxygen. The positive effect of Sm on increasing the WGS activity of Co/CeO2 is because Sm contributes to the reduction of Ce4+ to Ce3+ which gives rise to oxygen vacancies and facilitates the electron movement at the surface leading to an ease of surface reduction.
Keywords:Water gas shift  Hydrogen production  Co  Ceria  Sm  Rare earths
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