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Carbon-supported catalysts containing Cu and Cr are active in oxidation and reduction reactions. In CO oxidation experiments, an activity hysteresis has been observed for the Cu/Cr-carbon catalyst during temperature cycling. From results of CO oxidation experiments and Temperature-Programmed Reduction (TPR) in CO of fresh, pre-reduced and pre-oxidized samples, it is concluded that an oxidation-reduction cycle of the active phase is the reason for this hysteresis phenomenon. Furthermore, TPR(C0) reveals the presence of highly active oxygen species on a Cu/Cr catalyst, which might be the reactive intermediate in CO oxidation. It is also shown that the active phase catalytically oxidizes the carbon support, resulting in a high TPR(C0) background.
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