Reaction Kinetics and Secondary Organic Aerosol Composition Analysis of 2-Cyclohexen-1-one with NO3 Radicals

Unsaturated ketones are typical oxygenated volatile organic compounds (OVOCs) with high reactivity, and are important precursors in air pollution. The sources of OVOCs are complex and include direct emissions and secondary oxidation formation of VOCs in the atmosphere. 2-Cyclohexen-1-one is a widespread substance, and is derived from the industrial catalytic oxidation of cyclohexene. In this paper, we investigated the rate constants of the chemical reactions of 2-cyclohexen-1-one with NO 3 radicals, which is (7.25±0.29)×10 −15 cm 3 ·molecule −1 ·s −1 at 298 K and under 1 atm (1 atm=101325Pa). It supplemented the kinetics of NO 3 radicals database, and revealed its effects in the nighttime atmosphere. In addition, the reaction products of 2-cyclohexen-1-one with NO 3 radicals were detected by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), which revealed a series of nitrate esters in the composition of the secondary organic aerosol (SOA), which may reduce atmospheric visibility. Finally, the possible pathways for the generation of the products were developed.