Rate constants of the reactions of O( 3 P) atoms with Br 2 and NO 2 over the temperature range 220‐950 K - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Chemical Kinetics Année : 2019

Rate constants of the reactions of O( 3 P) atoms with Br 2 and NO 2 over the temperature range 220‐950 K

Résumé

The kinetics of the reactions of Br2 and NO2 with ground state oxygen atoms have been studied over a wide temperature range, T = 220-950 K, using a low-pressure flow tube reactor coupled with a quadrupole mass spectrometer: O + NO2 → NO + O2 (1) and O + Br2 → Br + BrO (2). The rate constant of reaction (1) was determined under pseudo–first-order conditions, either monitoring the kinetics of O-atom or NO2 consumption in excess of NO2 or of the oxygen atoms, respectively: k1 = (6.1 ± 0.4) × 10−12 exp((155 ± 18)/T) cm3 molecule−1 s−1 (where the uncertainties represent precision at the 2σ level, the estimated total uncertainty on k1 being 15% at all temperatures). The temperature dependence of k1, found to be in excellent agreement with multiple previous low-temperature data, was extended to 950 K. The rate constant of reaction (2) determined under pseudo–first-order conditions, monitoring the kinetics of Br2 consumption in excess of O-atoms, showed upward curvature at low and high temperatures of the study and was fitted with the following three-parameter expression: k2 = 9.85 × 10−16 T1.41 exp(543/T) cm3 molecule−1 s−1 at T = (220-950) K, which is recommended from the present study with an independent of temperature conservative uncertainty of 15% on k2
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Dates et versions

hal-02136030 , version 1 (12-01-2022)

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Yuri Bedjanian, Chaitanya Kalyan. Rate constants of the reactions of O( 3 P) atoms with Br 2 and NO 2 over the temperature range 220‐950 K. International Journal of Chemical Kinetics, 2019, 51 (7), pp.476-483. ⟨10.1002/kin.21270⟩. ⟨hal-02136030⟩
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