Atmospheric degradation mechanism of Z/E-CF3CF=CHCl, CF3CF=CCl2, and CF2=CFCl initiated by OH radicals using a smog chamber with long-path FT-IR at 298 K

Abstract

The products and mechanism for the OH-initiated reaction with the Cl-containing fluoroolefins Z/E-CF3CF=CHCl, CF3CF=CCl2, and CF2=CFCl were investigated, using a smog chamber linked to a Fourier-transform infrared spectrometer. That Cl atoms were generated from Cl-containing fluoroolefin reactions with OH radicals was proven, and significant acceleration was observed during the experiments. The corresponding Cl-initiated reaction products were identified as CF3CFClC(O)H for Z/E-CF3CF=CHCl, CF3CFClC(O)Cl for CF3CF=CCl2, and CF2ClC(O)F for CF2=CFCl. The influence of Cl-release on the kinetic study using the relative method was also discussed. Mechanisms for smog chamber reactions between Cl-containing fluoroolefins and OH radicals and Cl atoms, and their atmospheric degradation mechanisms, were proposed, based on the identification and quantification of detected products. Secondary atmospheric impacts from these products were also discussed.