The effect of Ce on catalytic decomposition of chlorinated methane over RuOx catalysts

• RuO2 catalysts highly dispersed on Ce-Al2O3 were prepared by wet impregnation.
• Ru/Ce-Al2O3 catalysts present high activity and stability for CH2Cl2 combustion.
• The removal of Cl species from catalyst surface is promoted by surface oxygen.
• High stable activity can be ascribed to the synergistic effect of acidity and high oxygen mobility.

sRu oxide catalysts supported on Ce-Al2O3 with various Ce contents were prepared by wet impregnation with RuCl3 aqueous solution and characterized by XRD, N2 adsorption, TEM/HRTEM, H2-TPR, Raman and NH3-TPD. The catalytic combustion of dichloromethane (DCM) was investigated over the Ru/Ce-Al2O3 catalysts at first time. The Ru/Ce-Al2O3 catalysts present an outstanding catalytic activity. Ru/7%Ce-Al2O3 catalyst is most active, and DCM is converted completely at 270 °C. At 250 °C, the conversion of DCM over the Ru/Ce-Al2O3 catalysts with 3% or higher Ce contents keeps constant within 1000 h. High stable activity of the Ru/Ce-Al2O3 catalysts can be ascribed to the synergistic effect of acidity and high oxygen mobility.

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