On adduct formation and reactivity in the OCS + OH reaction: A combined theoretical and experimental study

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The OCS + OH reaction occurs either via adduct formation or direct S-abstraction. We investigate OH-oxidation of OCS using quantum chemical methods and find that the OC(OH)S adduct reacts rapidly with O2forming SOOH + CO2. SOOH rapidly dissociates under atmospheric conditions regenerating OH. We interpret earlier experimental results based on monitoring OH-loss, and find that OH-regeneration in presence of O2may explain the insensitivity of the reaction rate to pressure and O2. We calculate a rate constant of 3.52×10-16 cm3 s−1at 10 Torr increasing to 7.20×10-16 cm3 s−1at 700 Torr. In addition we present a new experimental determination of the OCS + OH rate constant of (5.3±3.6)×10-15 cm3 s−1at 296  and 700 Torr using relative-rate technique.

Original languageEnglish
JournalChemical Physics Letters
Pages (from-to)111-117
Number of pages7
Publication statusPublished - 2017

    Research areas

  • Computational chemistry, Kinetics, OCS, OH, Relative rate, SOOH

ID: 176438535