Influence of Mn doping on the performance of CuO-CeO2 catalysts for selective oxidation of CO in hydrogen-rich streams

CuO-CeO2 catalysts with different amounts of Mn doping were prepared by a hydrothermal method and were investigated by means of X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), temperature-programmed reduction (H-2-TPR), X-ray photoelectron spectroscopy (XPS) and UV-Raman. The results show that MnOx-CuO-CeO2 catalyst with Mn:Cu =1:5 exhibits the best catalytic activity and the broadest operating temperature window for the high conversion (CO conversion >99.0%, 110-140 degrees C) in the selective oxidation of CO in hydrogen-rich streams. Doping an appropriate amount of Mn in CuO-CeO2 catalyst is beneficial to the formation of a more stable solid solution with a larger surface area and smaller particle size, and the redox properties of the catalysts are also enhanced, which improves the selective oxidation performance of CO in hydrogen-rich streams. Crown (C) 2010 Published by Elsevier B.V. All rights reserved.