A kinetic study of the reaction of atomic oxygen with SO₂

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Article on a kinetic study of the reaction of atomic oxygen with SO₂.

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7 p.

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Naidoo, Jacinth; Goumri, Abdellatif & Marshall, Paul 2005.

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Article on a kinetic study of the reaction of atomic oxygen with SO₂.

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7 p.

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Abstract: The effective second-order rate constant for O+SO2 (+Ar)→SO3 (+Ar) has been measured by pulsed laser-photolysis with resonance fluorescence detection of atomic oxygen under pseudo-first-order conditions. The pressure dependence was determined at five temperatures in the range 290–840K. The results obtained at pressures up to 880mbar reveal fall-off behavior. With an estimated broadening parameter Fc, Troe fits to the measurements yield the low-pressure limit k0=9.5×10−23T−3exp(−2400/T)cm6molecule−2s−1 and the high-pressure limit k∞=6.1×10−13exp(−850/T)cm3molecule−1s−1. An RRKM extrapolation of the present k0 values yields k0=6.7×10−21T−3.6exp(−2610/T)cm6molecule−2s−1, which is in good accord with several literature values over 220–2500K. At low temperatures, k0 shows a positive activation energy rationalized in terms of a barrier of 15.9kJmol−1, and k0 reaches a maximum at around 750K. Our expression for k∞ is in order-of-magnitude accord with values used to model a flow reactor and indicates a small pre-exponential factor. This may reflect the probability of triplet–singlet transitions in the spin-forbidden addition reaction and/or a tight transition state.

Copyright © 2004 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

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  • Proceedings of the Combustion Institute, 2005, Amsterdam: Elsevier Science Ltd., pp. 1219-1225

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  • Publication Title: Proceedings of the Combustion Institute
  • Volume: 30
  • Page Start: 1219
  • Page End: 1225
  • Pages: 7
  • Peer Reviewed: Yes

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  • 2005

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  • April 25, 2015, 8:59 p.m.

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Naidoo, Jacinth; Goumri, Abdellatif & Marshall, Paul. A kinetic study of the reaction of atomic oxygen with SO₂, article, 2005; [Amsterdam, Netherlands]. (digital.library.unt.edu/ark:/67531/metadc503256/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.