MnOx/Ce0.5+xZr0.4−xLa0.1O1.95-Al2O3 catalysts used for benzene catalytic combustion

Complete oxidation of benzene over supported manganese oxides catalysts was studied. Composite supports Ce0.5+xZr0.4−xLa0.1O1.95-Al2O3 (x=0, 0.1, 0.2, 0.3, 0.4), and CeO2-Al2O3 were prepared by co-precipitation method, and manganese oxides (MnOx) catalysts were prepared by incipient wetness method. Catalytic activity was performed in a conventional fixed bed flow reactor. Among these catalysts, MnOx supported on Ce0.8Zr0.1La0.1O1.95-Al2O3 was found to have the highest catalytic activity for benzene oxidation. The complete conversion temperature of benzene on MnOx/Ce0.8Zr0.1La0.1O1.95-Al2O3 was 328 °C. The catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) specific surface area, X-ray photoelectron spectra (XPS) and H2-temperature programmed reduction (H2-TPR). The results of BET and XRD measurements indicated that the addition of ZrO2 improved the textural properties. XPS measurements showed that MnOx was composed of MnO2 and Mn2O3. The catalysts reported in this work have significant potential in industrial application for their high performance and low cost.