Kinetics and mechanisms of the gas-phase reactions of OH radicals with three C15 alkanes

Bo Shi (1) , Weigang Wang (1) , Li Zhou (1, 2, 3) , Junling Li (1) , Jing Wang (1) , Yan Chen (1) , Wenyu Zhang (1) , Maofa Ge (1)

1 BNLMS - Beijing National Laboratory for Molecular Sciences
2 ICARE - Institut de Combustion, Aérothermique, Réactivité et Environnement
3 OSUC - Observatoire des Sciences de l'Univers en région Centre

The reaction constants and products for the reactions of OH radicals with different C15 alkanes, were determined by using Proton-Transfer-Reaction Mass Spectrum (PTR-MS) in the smog chamber. Rate coefficients (in units of 10−11 cm3 molecule−1 s−1) k1(pentadecane) = 1.72 ± 0.18,k2(2,6,10-trimethyldodecane) = 1.90 ± 0.20, k3(nonylcyclohexane) = 2.09 ± 0.22 were first obtained by the relative rate method using toluene and m-xylene as reference compounds at (298 ± 1)K and atmospheric pressure. In addition, the products of these reactions were measured by PTR-MS simultaneously. The results show that the major gas phase products observed in the OH radicals reactions were aldehydes and ketones for C15 alkanes. The possible reaction mechanisms were speculated and the atmospheric implications were also discussed.

Mots clés: OH radicals; Reaction rate constants; Photooxidation; Smog chamber

Domaines: Planète et Univers [physics]

Bo Shi, Weigang Wang, Li Zhou, Junling Li, Jing Wang, et al.. Kinetics and mechanisms of the gas-phase reactions of OH radicals with three C15 alkanes. Atmospheric Environment, 2019, 207, pp.75-81. ⟨10.1016/j.atmosenv.2019.03.028⟩. ⟨insu-03344071⟩