Issue 4, 1991

Redox behaviour of copper(II) ion pairs as surface species on CuTh oxide catalysts. Electron paramagnetic resonance and X-ray photoelectron spectroscopy study

Abstract

EPR and XPS have been used to study the redox reaction on CuTh oxide catalysts with different Cu/Th atomic ratios. Apart from the substitutional (S) sites occupied by Cu2+ ions both in the bulk and on the surface of thoria, other Cu2+ ions, occupying different sites on the surface were susceptible to H2 and/or O2 treatment at different temperatures. In particular, copper(II) ion pairs which can be obtained at high copper contents (Cu/Th > 0.01) are formed from one copper(II) ion, reducible by hydrogen, and another, corresponding to substitutional surface sites (Ss), which remains stable towards hydrogen. The migration of some Cu2+ ions, from sites very susceptible to the cyclic redox treatment, is responsible for the growth of CuO crystallites on the surface of CuTh oxide catalysts.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1991,87, 631-636

Redox behaviour of copper(II) ion pairs as surface species on CuTh oxide catalysts. Electron paramagnetic resonance and X-ray photoelectron spectroscopy study

A. A. Kaïs, R. Bechara, D. Ghoussoub, C. F. Aïssi, M. Guelton and J. P. Bonnelle, J. Chem. Soc., Faraday Trans., 1991, 87, 631 DOI: 10.1039/FT9918700631

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