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• W2038386054 abstract "The thermal dissociation of SO3 has been studied for the first time in the 1000−1400 K range. The experiments were conducted in a laminar flow reactor at atmospheric pressure, with nitrogen as the bath gas. On the basis of the flow reactor data, a rate constant for SO3 + N2 → SO2 + O + N2 (R1b) of 5.7 × 1017 exp(−40000/T) cm3/(mol s) is derived for the temperature range 1273−1348 K. The estimated uncertainty is a factor of 2. The rate constant corresponds to a value of the reverse reaction of k1 ≈ 1.8 × 1015 cm6 mol-2 s-1. The reaction is in the falloff region under the investigated conditions. The temperature and pressure dependence of SO2 + O (+N2) was estimated from the extrapolation of low temperature results for the reaction, together with an estimated broadening parameter and the high-pressure limit determined recently by Naidoo, Goumri, and Marshall (Proc. Combust. Inst. 2005, 30, 1219−1225). The theoretical rate constant is in good agreement with the experimental results. The improved accuracy in k1 allows a reassessment of the rate constant for SO3 + O → SO2 + O2 (R2) based on the data of Smith, Tseregounis, and Wang (Int. J. Chem. Kinet. 1982, 14, 679−697), who conducted experiments on a low-pressure CO/O2/Ar flame doped with SO2. At the location in the flame where the net SO3 formation rate is zero, k2 = k1[SO2][M]/[SO3]. A value of 6.9 × 1010 cm3 mol-1 s-1 is obtained for k2 at 1269 K with an uncertainty a factor of 3. A recommended rate constant k2 = 7.8 × 1011 exp(−3065/T) cm3 mol-1 s-1 is consistent with other flame results as well as the present flow reactor data." @default.
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• W2038386054 date "2006-01-12" @default.
• W2038386054 modified "2023-10-16" @default.
• W2038386054 title "Thermal Dissociation of SO₃ at 1000−1400 K" @default.
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• W2038386054 doi "https://doi.org/10.1021/jp0557215" @default.
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