Activity and Characteristics of Cu-Mn Oxide Catalysts Supported on gamma-Al2O3

The catalytic oxidation of toluene over gamma-Al2O3 supported copper-manganese oxide catalysts in the temperature range of 160-280 degrees C was investigated by employing a fixed bed flow reactor. The catalysts were characterized by BET, scanning electron microscopy (SEM), temperature-programmed reduction(TPR), temperature-programmed oxidation(TPO), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction(XRD) techniques. Catalytic oxidation of toluene was achieved at the below 280 degrees C, and the optimal content of copper and manganese in the catalyst was found to be 15.0 wt%Cu-10.0 wt%Mn. From the TPR/TPO and XPS results, the redox peak of 15 Cu-10 Mn catalyst shifted to the lower temperature, and the binding energy was shifted to the higher binding energy. Furthermore, It is considered that Cu1.5Mn1.5O4 is superior to Mn oxides and CuO in the role as active factor of catalysts from the XRD results and also catalytic activities are dependent on the redox ability and high oxidation state of catalysts.