Kinetic study of the reaction of chlorine atoms with hydroxyacetone in gas-phase

Clara Stoeffler (1) , Lilian Joly (1) , Georges Durry (1) , Julien Cousin (1) , Nicolas Dumelié (1) , Aurélien Bruyant (2) , Estelle Roth (1) , Abdelkhaleq Chakir (1)

1 GSMA - Groupe de spectrométrie moléculaire et atmosphérique
2 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique

In this letter the kinetics of the reaction of hydroxyacetone CH3C(O)CH2OH with Cl atoms is investigated using the relative rate technique. Experiments are carried out in a 65 L multipass photoreactor in the temperature range of 281–350 K. A mid-infrared spectrometer based on a quantum cascade laser in external cavity emitting at 9.5 μm is used to analyze the reactants. The determined rate coefficient for the investigated reaction is (1.7 ± 0.3) × 10−11exp(381.5 ± 57.3/T). The results are presented and discussed in terms of precision and compared with those obtained previously. The impact of Cl atoms on the atmospheric life time of hydroxyacetone is also discussed.

Domaines: Chimie-Physique [physics.chem-ph]

Clara Stoeffler, Lilian Joly, Georges Durry, Julien Cousin, Nicolas Dumelié, et al.. Kinetic study of the reaction of chlorine atoms with hydroxyacetone in gas-phase. Chemical Physics Letters, 2013, 590, pp.221-226. ⟨10.1016/j.cplett.2013.10.063⟩. ⟨hal-02374852⟩