Dismutation of CF2Cl2 on differently pretreated alumina samples and the role of surface acidity in this reaction were investigated in the temperature range of 200-350degreesC and at a CF2Cl2 partial pressure of 0.025 atm. Our results support a reaction mechanism involving the direct participation of the surface in halogenating the reacting CF2Cl2 molecule without any need for this reaction to occur in a concerted manner. Surface acidity was found to enhance the activation process of alumina and to suppress its deactivation at low temperatures and at low CF2Cl2 Partial pressures.