Thermal dissociation of SO₃ at 1000-1400 K

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Article on the thermal dissociation of SO3 at 1000 - 1400 K.

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6 p.

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Yilmaz, Ayten; Hindiyarti, Lusi; Jensen, Anker Degn; Glarborg, Peter & Marshall, Paul January 12, 2006.

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Article on the thermal dissociation of SO3 at 1000 - 1400 K.

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6 p.

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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.

Reprinted with permission from the Journal of Physical Chemistry A. Copyright 2006 American Chemical Society.

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  • Journal of Physical Chemistry A, 2006, Washington D.C.: American Chemical Society, pp. 6654-6659

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  • Publication Title: Journal of Physical Chemistry A
  • Volume: 110
  • Issue: 21
  • Page Start: 6654
  • Page End: 6659
  • Pages: 6
  • Peer Reviewed: Yes

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  • January 12, 2006

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  • March 17, 2015, 10:59 a.m.

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  • March 24, 2015, 12:16 p.m.

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Yilmaz, Ayten; Hindiyarti, Lusi; Jensen, Anker Degn; Glarborg, Peter & Marshall, Paul. Thermal dissociation of SO₃ at 1000-1400 K, article, January 12, 2006; [Washington, D.C.]. (digital.library.unt.edu/ark:/67531/metadc501428/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.