Significant effect of multi-doped cerium oxide for carbon monoxide oxidation studies

Abstract

Current work composed of transition metal substituted CeO2 catalysts for the catalytic conversion of CO to CO2. The cerium oxide catalysts were successfully prepared via solution combustion method. The prepared oxides were characterized using various techniques such as X-ray diffraction (XRD), Infra-red spectroscopy (IR), thermogravimetry-differential thermal analysis (TG/DTA), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Brunauer-Emmett-Teller surface area (BET). Further, surface oxygen mobility and CO consumption capacity of the catalyst were studied using H2-Temperature programmed reduction (H2-TPR) and CO pulse titration, respectively. It was observed that substitutions of Mn, Cu and Ag in CeO2 system could produce more synergy interactions. The result of CO oxidation demonstrates the doping Mn, Cu and Ag in cerium oxide has increased the CO conversion rate and achieves 100% conversion at 95 °C as compared to other catalyst from the series. Such enhanced activity can be related to synergistic effect in the cerium oxide by addition of Mn, Cu and Ag. Overall reduction pattern of the catalysts and CO adsorption profile on the catalysts surface were in support of CO oxidation reaction.