Abstract
The reaction rates of CO and H 2 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/O 2 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/O 2 partial pressures chosen to maximise the reaction rate.
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