Catalytic Oxidative Decomposition of Dichlorodifluoromethane (CFC-12) Using Alumina–Zirconia Supported Tungsten(VI) Oxide with a Platinum-Group Metal

Abstract

The oxidative decomposition of dichlorodifluoromethane (CFC-12) over tungsten(VI) oxide-loaded alumina–zirconia at low temperature has been investigated. Oxidative decomposition in air was found achieve higher initial CFC-12 conversion rates than hydrolysis and oxidative decomposition in the presence of water or butane, although the conversion rate decreased markedly with time on stream. Loading the alumina–zirconia support with platinum-group metals results in higher sustained activity, and the addition of platinum in particular allows the initial conversion rate to be maintained for at least 4 h on stream.