Add time:08/13/2019         Source:sciencedirect.com

Rate coefficients for the reactions of hydroxyl radicals with ethyl vinyl ketone and Vinyl propionate (cas 105-38-4) were determined at 298 K and atmospheric pressure. A collapsible chamber with gas chromatography was used to perform relative kinetic determinations. The room temperature rate coefficients (in cm3 molecule−1 s−1) were: k1(OH + CH2CHC(O)CH2CH3) = (2.90 ± 0.79) × 10−11 and k2(OH + CH2CHOC(O)CH2CH3) = (2.46 ± 0.28) × 10−11. This is the first kinetic study of title reactions under atmospheric conditions. The kinetic data were compared with previous literature values, used to calculate atmospheric lifetimes and correlated with the ionization potential of the unsaturated compounds.

► First determination of the rate coefficients of the reactions of OH with ethyl vinyl ketone and vinyl propionate under atmospheric conditions. ► The rate coefficient of the reaction of OH with ethyl vinyl ketone agrees with an absolute value and SAR estimations reported in literature. ► There is a good correlation between the rate coefficients of the OH reactions with unsaturated carbonyl with the ionization potentials of the VOC. ► The VOCs studied react mainly with OH radicals with lifetimes of few hours.

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