Carbon Monoxide Oxidation on Copper Oxide Thin Films Supported on Corrugated Cerium Dioxide {111} and {001} Surfaces |
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| Affiliation: | 2. Department of Chemical Engineering II, Lund University, Chemical Center, P.O. Box 124, 221 00, Lund, Sweden;3. Department of Physics and Measurement Technology, Linköping University, S-581 83, Linköping, Sweden;1. Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), CCT-La Plata CONICET, CICPBA, C.C. 49 (B1897ZCA) M. B. Gonnet, Provincia de Buenos Aires, Argentina;2. School of Dentistry of Ribeirão Preto, University of São Paulo (FORP-USP), Avenue Do Café, s/n- Campus USP Monte Alegre, 14040-904, Ribeirão Preto, São Paulo, Brazil;1. College of Chemistry and Chemical Engineering, Neijiang Normal University, Neijiang, Sichuan 641100, China;2. College of Chemistry and Chemical Engineering, Yangtz Normal University, Chongqing 408100, China;3. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;1. Department of Physics, Panjab University, Chandigarh 160014, India;2. CSIR-National Physical Laboratory, New Delhi 110012, India |
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| Abstract: | Thin films of CeO2with and without a thin layer of copper oxide were prepared by rf magnetron sputtering on surfaces of α-Al2O3(sapphire) substrates. Careful characterisation of the surfaces was performed down to the atomic level using high-resolution electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy. Surprisingly, the as-deposited, corrugated ceria surfaces, nominally (001), consist exclusively of {111}-type lattice planes, but, upon annealing at 800°C, a well-defined portion of (001) surfaces are formed. Oxidation of carbon monoxide to carbon dioxide was studied, having the prepared films in a stirred batch reactor. A batch reactor was chosen so that the conversion over the small sample surface area (ca 10−4m2) could be monitored as a function of the reaction time. The activity of copper oxide on annealed ceria surfaces is markedly higher than on nonannealed surfaces, indicating a favourable synergetic effect between the ceria (001) surface and the copper oxide phase. |
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