Cu/CeO2as efficient low-temperature CO oxidation catalysts: effects of morphological structure and Cu content

Cu loaded on different morphologies of CeO(2)were synthesized and tested by SEM and CO catalytic oxidation experiment, the results indicated that with the same Cu load, nanorod-like Cu/CeO(2)performed the best catalytic activity than 3D flower-like Cu/CeO(2)and gear-like Cu/CeO2. Then nanorod-like Cu/CeO(2)were chose to explore the best Cu load on CeO(2)nanorods for CO oxidation. Cu/CeO(2)nanorods were characterized by TEM, XRD, XPS as well as physical and chemical adsorption. The results indicate that 0.15Cu/CeO(2)nanorods have the best catalytic activity because of more reducing copper species (Cu+), adsorbed oxygen (O-ads) and Ce(3+)species on the catalysts surface, which can achieve 99% CO conversion at 100 degrees C. The effect of CO(2)and water vapor on catalytic activity was also examined.