Effect of Fe doping on the catalytic performance of CuO–CeO2 for low temperature CO oxidation

Cu1Ce8Fex–O catalysts for low temperature CO oxidation were prepared by an improved citrate sol–gel method with incorporation of thermal treatment under N2, and characterized by the nitrogen adsorption–desorption, XRD, CO pulse experiments, CO-TPR and CO-TPD. When x = 1, the Cu1Ce8Fe1–O catalyst shows higher catalytic activity for CO oxidation, and the reaction temperature for 90% CO conversion (T90) is only 50 °C. The presence of Fe in Cu1Ce8Fe1–O can improve the catalytic activity for CO oxidation, which results from its higher surface area, smaller crystalline size, higher activity and larger amounts of surface oxygen species.