MnO_x/Al_2O_3/Ce_(0.45)Zr_(0.45)M_(0.10)O_y (M = Mn, Y, La) catalysts used for ethanol catalytic combustion

摘要

MnOx/Al2O3/Ce0.45Zr0.45M0.10Oy (M = Mn, Y, La) catalysts were prepared by impregnation method and characterized by BET, TPR and XRD analyses. The catalytic activities toward ethanol combustion were investigated in a microreactor. The results demonstrated that the catalytic activity of MnOx/Al2O3/Ce0.50Zr0.50O2 monolithic catalyst could be improved by doping Mn, Y and La into Ce0.50Zr0.50O2. When doping Y into Ce0.50Zr0.50O2, the catalyst MnOx/Al2O3/Ce0.45Zr0.45Y0.10O1.95 showed the highest activity. The 100% conversion temperature of ethanol was 230 °C. Furthermore, once the conversion of ethanol started, the complete conversion was quickly achieved. The doping of Mn, Y and La led to better activity for ethanol combustion and lower temperature reduction peaks in TPR profiles. The doping of Mn resulted in enhanced oxygen storage capacity (OSC), larger area of the reduction peaks, and excellent reactivity, and the doping of Y resulted in the lowest reduction temperature and the best activity.