Inverse rod-like CeO2 supported on CuO prepared by hydrothermal method for preferential oxidation of carbon monoxide

The CeO2/CuO catalysts were synthesized by the hydrothermal method and characterized via XRD, BET, SEM, H-2-TPR, XPS and HRTEM techniques. The results showed that CeO2 with two kinds of morphologies (particle and rod-like CeO2) was highly dispersed on the surface of the catalysts when Ce/Cu molar ratio exceeded 0.25. The rod-like CeO2 exposed more (1 1 1) planes, and this was helpful for oxygen storage and transportation. Moreover, the contact interface between highly dispersed CuO and bulk ceria supplied the active sites not only for CO oxidation but also for H-2 oxidation, but the contact interface of highly dispersed ceria and bulk CuO was more favorable for CO oxidation than H-2 oxidation. (C) 2012 Elsevier B.V. All rights reserved.