Abstract
High performance CuO-CeO 2 catalysts for selective oxidation of CO in excess hydrogen were prepared by a hydrothermal method under different preparation conditions and evaluated for catalytic activities and selectivities. By changing the n CTAB/n Ce ratio and hydrothermal aging time, the catalytic activity of the CuO-CeO 2 catalysts increased and the operating temperature window, in which the CO conversion was higher than 99%, was widened. XRD results showed no peaks of CuO x species and Cu-Ce-O solid solution were observed. On the other hand, Cu + species in the CuO-CeO 2 catalysts, which was associated with a strong interaction between copper oxide clusters and cerium oxide and could be favorable for improving the selective oxidation performance of CO in excess H 2, were detected by H 2-TPR and XPS techniques.
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