Electron spin resonance study of the structural properties of copper–chromium oxide catalysts

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Abstract
Copper–chromium catalysts with spinel structure and containing different amounts of copper are shown to have residual ferrimagnetic behaviour at room temperature. The small super-exchange interactions, sensitively characterized by octahedral Cr3+ e.s.r. linewidth and magnetic susceptibility determination, are drastically modified by redox treatment and variation of the Cu/Cr ratio. Comparison with ESCA results leads these modifications to be assigned to octahedral Cu+ concentration changes, which are quantitatively determined. Existence of such copper sites, even in the presence of isoprene, which is hydrogenated to mono-olefin, suggests that octahedral Cu+ ions play an important role in the selective hydrogenation catalysis.

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