Kinetic Study of the Temperature Dependence of OH-Initiated Oxidation of n-Dodecane

Houssni Lamkaddam (1) , Aline Gratien (1) , Manon Ropion (1) , Edouard Pangui (1) , Jean-François Doussin (1)

1 LISA (UMR_7583) - Laboratoire Interuniversitaire des Systèmes Atmosphériques

Reaction rate constants for the reaction of n-dodecane with hydroxyl radicals were measured as a function of temperature between 283 and 303 K, using the relative rate method in the CESAM chamber (French acronym for "Chamber for Atmospheric Multiphase Experimental Simulation"). The rate constants obtained at 283, 293 and 303 K are (1.27 ± 0.31)×10-11 , (1.33 ± 0.34)×10-11 , (1.27 ± 0.40)×10-11 cm 3 molecule-1 s-1 , respectively. Rate constants measured were in excellent agreement with the few available data in the literature over the studied temperature range (283-340K). Rate constants estimated by the structure-activity relationship and transition state theory methods agreed with our experimental data within 14 %. From these data combined with previous literature measurement, the following Arrhenius expression; + = (9.77 ± 6.19)10 −11 × exp [ −595 ±5580 ] 3 −1 −1 , was found valid over a temperature range (283-340 K) of the tropospheric interest.

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

Houssni Lamkaddam, Aline Gratien, Manon Ropion, Edouard Pangui, Jean-François Doussin. Kinetic Study of the Temperature Dependence of OH-Initiated Oxidation of n-Dodecane. 2020. ⟨hal-02435165⟩