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, H2-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 H2 oxidation, but the contact interface of highly dispersed ceria and bulk CuO was more favorable for CO oxidation than H2 oxidation.

It was clear that the temperature window of CO total conversion over the CeO2/CuO catalysts was wider than that of the traditional CuO/CeO2 catalyst, also the selectivity of the CeO2/CuO catalysts was obviously higher that of the traditional CuO/CeO2 catalyst in the temperature range of performance test. These results showed that the contact interface between highly dispersed CuO and bulk ceria supplied the active sites not only for CO oxidation but also for H2 oxidation, but the contact interface of highly dispersed ceria and bulk CuO was more favorable for CO oxidation than H2 oxidation.Figure optionsDownload as PowerPoint slideHighlights
► Inverse CeO2/CuO catalysts were synthesized by hydrothermal method for CO-PROX.
► Particle and rod-like CeO2 was highly dispersed on the surface of catalysts.
► Rod-like CeO2 exposed more (1 1 1) planes and helped O2 storage and transportation.
► Contact interface of CuO and bulk CeO2 supplied active sites for CO and H2 oxidation.
► Contact interface of CeO2 and bulk CuO was more favorable for CO oxidation.