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. (1st December 2019)

• Record Type: Journal Article
• Authors: Guo, Qin; Chen, Liang; Mizukado, Junji
• Is Part Of: Atmospheric environment. Volume 218(2019)
• Publication Date: 2019-12-01
• Subjects: Atmospheric degradation -- Cl-containing olefins -- OH radicals -- Smog chamber; Air -- Pollution -- Periodicals; Air -- Pollution -- Meteorological aspects -- Periodicals; 551.51
• DOI: 10.1016/j.atmosenv.2019.116991
• Languages: English
• ISSNs: 1352-2310

Abstract

Abstract: The products and mechanism for the OH-initiated reaction with the Cl-containing fluoroolefins Z / E -CF3 CF=CHCl, CF3 CF=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 CF3 CFClC(O)H for Z / E -CF3 CF=CHCl, CF3 CFClC(O)Cl for CF3 CF=CCl2, and CF2 ClC(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. Graphical abstract: Image 1 Highlights: The degradation products and mechanism for Cl-containing olefins were studied. Cl atom generation was confirmed in the reaction chamber. An accelerated decay for the Cl-containing olefins was observed in the chamber. Their degradation mechanism in chamber and real atmosphere was compared. The environmental impacts of the Cl-containing olefins were discussed.