No abstract

The catalytic oxidative decomposition of chlorofluorocarbons (CFC’s) was carried out in the presence of butane. The reactivity of CFC’s was the following order: CFC-113 > CFC-114 > CFC-115. The reactivity decreased as the content of fluorine in the CFC’s increased. γ-Alumina was an effective catalyst among silica and various acidic oxides. Vanadium(V) oxide and tungsten(VI) oxide were found to exhibit a higher activity than the other metals and metal oxides when supported on γ-alumma.

The catalytic oxidative decomposition of chloropentafluoroethane (CFC-115) was carried out in the presence of butane. Alumina-zirconia exhibited the highest activity alumina). When metal oxides were supported on the alumina-zirconia, tungsten(VI) oxide alone had a positive effect on the activity. This tungsten(VI) oxide catalyst was found to be the most active of all the catalysts which had so far been examined, and to keep an activity for the CFC-115 decomposition as high as about 85% conversion all through the reaction.