Abstract

To assess the ozone depletion potentials of hydrochlorofluoromethanes (HCFMs) and hydrochlorofluoroethanes (HCFEs), atmospheric behaviors of these chlorofluorocarbon alternatives with OH radicals were investigated using quantum chemical and kinetic calculations. The results showed that the H-abstraction reactivity of HCFMs initiated by OH radicals enhances with the increase of the chlorination degree. The intermediate alkyl radicals can generate stable chlorofluorocarbons (CFCs) through self-reactions, which may compete with the reactions of radicals with O2 molecules and increase the risk of ozone layer depletion. The self-reactions of HCFEs result in the increase of carbon chain length, and formed hydrochlorofluorocarbons can further react with OH radicals.

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