The importance of diffusion in surface reactions demonstrated with STM |
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Authors: | Michael Bowker F Leibsle |
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Affiliation: | (1) Reading Catalysis Centre, Department of Chemistry, University of Reading, Whiteknights Park, RG6 6AD Reading, UK;(2) IRC in Surface Science, University of Liverpool, L69 3BX Liverpool, UK |
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Abstract: | We have used STM to observe directly a process which can be described as two-dimensional, surface-mediated Ostwald ripening, occurring during the decomposition of methoxy intermediates on a Cu(l10) surface. Some islands get bigger during the course of the reaction, at the expense of smaller ones, and it is shown that this diffusion is important for dictating the rate of methanol decomposition. This is proposed to occur from the dilute phase of methoxy existing in the inter-island region and the methoxy maintains a pseudo steady state there, supplied by diffusion from, and between, islands of adsorbate on the surface. |
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Keywords: | scanning tunnelling microscopy methanol oxidation methoxy surface diffusion Ostwald ripening atomic resolution |
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