Hydroxyl radical production from the gas-phase reactions of ozone with a series of alkenes under atmospheric conditions

TLDR: In this article, the gas phase reactions of O 3 with a series of alkenes have been investigated at 296±2 K and atmospheric pressure of air in the presence of cyclohexane at concentrations sufficient to scavenge any OH radicals formed.

Abstract: The gas-phase reactions of O 3 with a series of alkenes have been investigated at 296±2 K and atmospheric pressure of air in the presence of cyclohexane at concentrations sufficient to scavenge any OH radicals formed. The expected products of the OH radical-initiated reaction of cyclohexane, cyclohexanone and cyclohexanol, were observed in all cases. From a knowledge of the chemistry of cyclohexane in these reaction systems and the cyclohexanone and cyclohexanol formation yields obtained, the following formation yields of OH radicals in these O 3 -alkene reactions were derived: propene, 0.33; 1-butene, 0.41; 2-methylpropene, 0.84; cis-2-butene, 0.41; trans-2-butene, 0.64; 2-methyl-1-butene, 0.83; 2-methyl-2-butene, 0.89; 2,3-dimethyl-2-butene, 1.00; cyclohexene, 0.68; 1,3-butadiene, 0.08; all with estimated overall uncertainties of a factor of ∼1.5