Journal article

Mechanistic study of the reaction of CH2F2 with Cl atoms in the absence and presence of CH4 or C2H6: decomposition of CHF2OH and fate of the CHF2O radical.

Freja F Østerstrøm, Christina Andersen, Gabriel da Silva

Phys Chem Chem Phys | Royal Society of Chemistry | Published : 2019

Abstract

To assess the atmospheric fate of fluorinated compounds, chamber experiments were performed with Fourier transform infrared spectroscopy investigating the products of difluoromethane, CH2F2, at 296 ± 2 K. The reactions were initiated by reaction of CH2F2 with Cl atoms in the absence and presence of CH4 or C2H6 in air or O2. No evidence of formation of the fluorinated alcohol, CHF2OH, from the reactions of the CHF2O2 radical with either CH3O2 or CH3CH2O2 was observed. However, evidence of an alkoxy radical pathway was observed to form CHF2OH. The alkoxy radical, CHF2O, abstracts a hydrogen atom from CH2F2 (with reaction mixtures of high initial CH2F2 concentrations) to give the alcohol CHF2OH..

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University of Melbourne Researchers

Grants

Awarded by Australian Research Council


Funding Acknowledgements

The authors wish to thank Timothy J. Wallington (Ford Motor Company) for letting us use the Ford smog chamber facility and performing the initial experiments with Jens S. Sehested (Haldor Topsoe A/S, Denmark). We also wish to thank Timothy J. Wallington, Jens S. Sehested, Mads P. Sulbaek Andersen (California State University Northridge, USA), and Ole John Nielsen (University of Copenhagen) for valuable discussions. Gabriel da Silva is supported by the Australian Research Council (FT130101304)