Equivalence of difluorodichloromethane (CFC-12) hydrolysis catalyzed by solid acid(base) MoO3(MgO)/ZrO2

Abstract

In this paper, a solid acid(base) MoO₃(MgO)/ZrO₂ was prepared for the catalytic hydrolysis of difluorodichloromethane (CFC-12). The effects of the catalyst preparation method, calcination temperature, and hydrolysis temperature on the conversion rate of CFC-12 were studied. The catalysts were characterized by XRD, N₂ isotherm adsorption desorption, NH₃-TPD, and CO₂-TPD. Meanwhile, the equivalence of the catalytic activity of MoO₃(MgO)/ZrO₂ for CFC-12 was studied. Research shows that the solid acid MoO₃/ZrO₂ and solid base MgO/ZrO₂ catalyzed hydrolysis of CFC-12 is equivalent; the solid acid MoO₃/ZrO₂ is calcined at 600 °C for 3 h and the solid base MgO/ZrO₂ is calcined at 600 °C for 6 h (co-precipitation) and 700 °C for 6 h (impregnated) at a catalytic hydrolysis temperature of 300–400 °C and CFC-12 concentration of 4%. The catalytic hydrolysis products obtained were CO, HCl, and HF, and the CFC-12 conversion rate almost reached 100%.