MnO x/Ce 0.5+ xZr 0.4− xLa 0.1O 1.95-Al 2O 3 catalysts used for benzene catalytic combustion

Abstract

Complete oxidation of benzene over supported manganese oxides catalysts was studied. Composite supports Ce 0.5+ x Zr 0.4− x La 0.1O 1.95-Al 2O 3 ( x=0, 0.1, 0.2, 0.3, 0.4), and CeO 2-Al 2O 3 were prepared by co-precipitation method, and manganese oxides (MnO x ) catalysts were prepared by incipient wetness method. Catalytic activity was performed in a conventional fixed bed flow reactor. Among these catalysts, MnO x supported on Ce 0.8Zr 0.1La 0.1O 1.95-Al 2O 3 was found to have the highest catalytic activity for benzene oxidation. The complete conversion temperature of benzene on MnO x /Ce 0.8Zr 0.1La 0.1O 1.95-Al 2O 3 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 H 2-temperature programmed reduction (H 2-TPR). The results of BET and XRD measurements indicated that the addition of ZrO 2 improved the textural properties. XPS measurements showed that MnO x was composed of MnO 2 and Mn 2O 3. The catalysts reported in this work have significant potential in industrial application for their high performance and low cost.