Catalytic Oxidation of Dichloromethane over Anodized Aluminum Film

Abstract

Catalytic total combustion of dichloromethane over anodized aluminum film was studied. Conversion of dichloromethane varies with the acidity of the catalysts, which depends on the hydration reaction on the anodized aluminum films. The effect of the hydration reaction time on the conversion of dichloromethane was discussed. The catalyst with a hydration reaction time of 90 min exhibits the highest activity for the oxidation of dichloromethane, because of the strongest acidity. The distribution of products was also discussed. When the reaction temperature was below 623 K, no molecular chlorine was detected. HCl, CO, CO₂ and CH₃Cl were detected in the reactor outlet. With an increased reaction temperature, molecular chlorine was generated. Catalyst deactivation was also investigated in this work. Compared with γ-Al₂O₃, the anodized aluminum film has excellent hydrophilic properties, thus no deactivation was observed during the deactivation experiment that lasted for 120 h at 673 K with 1000 ppm dichloromethane.