Elsevier

Journal of Catalysis

Volume 76, Issue 2, August 1982, Pages 320-332
Journal of Catalysis

Oxidation states of copper on alumina studied by redox cycles

https://doi.org/10.1016/0021-9517(82)90263-9Get rights and content

Abstract

Supported copper oxide on γ-alumina (2,4, or 10% Cu atoms per 100 A1) was subjected to cycles of reduction (by hydrogen) and oxidation (by oxygen). From the hydrogen consumed, from the water released and from the oxygen used in the oxidation step it was possible to deduce the molar fractions of Cu0, Cu1+ and Cu2+ present, as a function of the extent of reduction. At low copper loadings (2 or 4%) Cu1+ is preferentially formed. The reduction to Cu0 is thermodynamically favorable, but kinetically hindered. The role of the support and of the surface configuration is discussed.

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