Direct kinetic study of the oh-radical initiated oxidation of pivalaldehyde, (CH 3) 3CC(O)H, in the gas phase

E. Szabó, G. L. Zügner, M. Farkas, I. Szilágyi, S. Dóbé

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Abstract

The low-pressure fast discharge flow method was used to study the kinetics of the oxidation reaction system OH + (CH 3) 3CC(O)H + O 2 at room temperature. OH radicals were monitored by resonance florescence detection; helium was the carrier gas. The rate constant for the overall reaction between OH radicals and pivalaldehyde, (CH 3) 3CC(O)H was determined to be k 1(298 K) = (2.65 ± 0.34) × 10 -11 cm 3 mol -1 s -1, given with 2σ statistical uncertainty. The OH yields of Γ OH = 0.26 ±0.10 and Γ OH = 0.15 ± 0.06 were measured for the pivaloyl radical, (CH 3) 3CC(O), + O 2 reaction at P 1.81 and 3.46 mbar reaction pressures, respectively. Comparison with literature and the atmospheric implications have been discussed.

Original languageEnglish
Pages (from-to)538-544
Number of pages7
JournalOxidation Communications
Volume35
Issue number3
Publication statusPublished - Oct 29 2012

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Keywords

  • Atmospheric kinetics
  • OH product yield
  • OH reaction rate constant
  • Pivalaldehyde

ASJC Scopus subject areas

  • Chemistry(all)

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