Structural specificity in CO and H2 oxidation over single crystal copper surfaces |
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| Institution: | 1. Materials Science and Engineering, Graduate School of Science and Engineering, Koç University, Istanbul, Turkey;2. Koç University TÜPRAŞ Energy Center, Koç University, Istanbul, Turkey;3. Chemistry Department, Koç University, Istanbul, Turkey;4. SLAC National Accelerator Laboratory, Menlo Park, CA, USA;1. Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russian Federation;2. A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Pyzhevsky per., 3, Moscow, 119017, Russian Federation |
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| Abstract: | The reaction rates of CO and H2 with preadsorbed oxygen on copper surfaces in the 〈110〉 zone presented by a cylindrical single crystal are found to display strong structural sensitivity. In both cases the highest reaction rates are observed for surface structures involving both steps and low index face terraces, and in particular surfaces vicinal to {311} and between either {111} or {100} are found to exhibit the highest rates of reaction. Possible mechanisms for the reaction are discussed, and the data are extrapolated to investigate the steady state oxidation of CO in a CO/O2 gas mixture over copper surfaces in the 〈110〉 zone. The semi-empirical model describing the steady state oxidation reaction predicts that this reaction also exhibits marked crystallographic anisotropy at CO/O2 partial pressures chosen to maximise the reaction rate. |
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