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 (H2-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 °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.

Graphical abstractCuO-CeO2 catalysts with Mn doping were studied for the selective oxidation of CO in hydrogen-rich streams. CO conversions of up to 99.0% were attained from 110 to 140 °C, with O2 selectivity above 50%. The formation of a more stable solid solution with a larger surface area and smaller particle size after doping Mn contributed to the excellent performance.Figure optionsDownload full-size imageDownload high-quality image (56 K)Download as PowerPoint slide