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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

PADILLA-CAMPOS, LUIS. THE INTERACTION OF ATOMIC OXYGEN WITH SMALL COPPER CLUSTERS: A THEORETICAL APPROACH. J. Chil. Chem. Soc. [online]. 2005, vol.50, n.4, pp.745-752. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072005000400017.

A theoretical study of atomic oxygen adsorption on small Cun (n ­ 8) clusters was carried out using density functional methods. The copper-oxygen system is important to understand the mechanism of the oxygen oxidation catalyzed by copper. It is found that the oxygen reactivity is strongly dependent of the size of copper clusters and Cun with n odd exhibiting the highest reactivity. The adsorption energy has values from 37 to 93 kcal/mol. In general, in clusters with even number of atoms the oxygen adsorption is carried out on a top type site, on the other hand, in clusters with odd number of atoms the adsorption is carried out on highly coordinated sites. In comparison with bare Cun clusters, the relative stability of copper clusters under oxygen adsorption is not largely affected, exhibiting only small modifications in the structure of the cluster. Electronic and symmetrical effects seen to govern the oxygen adsorption process

Keywords : copper cluster; oxygen adsorption; quantum chemical calculations.

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