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Kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 K temperature range

The kinetics of the reaction of hydroxyl radical (OH) with trimethyl phosphate (CH(3)O)(3)PO (TMP) (reaction (1)) OH + TMP → products (1) was studied at the bath gas (He) pressure of 1 bar over the 273–837 K temperature range. Hydroxyl radicals were produced in fast reactions of electronically excit...

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Autores principales: Koshlyakov, P. V., Barkova, D. A., Gerasimov, I. E., Chesnokov, E. N., Zhang, Xiaokai, Krasnoperov, L. N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8697678/
https://www.ncbi.nlm.nih.gov/pubmed/35423916
http://dx.doi.org/10.1039/d1ra00911g
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author Koshlyakov, P. V.
Barkova, D. A.
Gerasimov, I. E.
Chesnokov, E. N.
Zhang, Xiaokai
Krasnoperov, L. N.
author_facet Koshlyakov, P. V.
Barkova, D. A.
Gerasimov, I. E.
Chesnokov, E. N.
Zhang, Xiaokai
Krasnoperov, L. N.
author_sort Koshlyakov, P. V.
collection PubMed
description The kinetics of the reaction of hydroxyl radical (OH) with trimethyl phosphate (CH(3)O)(3)PO (TMP) (reaction (1)) OH + TMP → products (1) was studied at the bath gas (He) pressure of 1 bar over the 273–837 K temperature range. Hydroxyl radicals were produced in fast reactions of electronically excited oxygen atoms O((1)D) with either H(2)O or H(2). Excited oxygen atoms O((1)D) were produced by photolysis of ozone, O(3), at 266 nm (4(th) harmonic of Nd:YAG laser) over the 273–470 K temperature range and by photolysis of N(2)O at 193 nm (ArF excimer laser) over the whole temperature range including the elevated temperature range 470–837 K. The reaction rate constant exhibits a V-shaped temperature dependence, negative in the low temperature range, 273–470 K (the rate constant decreases with temperature), and positive in the elevated temperature range, 470–837 K (the rate constant increases with temperature), with a turning point at 471 K. The rate constant could be fairly well fitted with the three parameter modified Arrhenius expression, k(1) = 7.52 × 10(−18) (T/298)(9) exp(34 367 J mol(−1)/RT) cm(3) per molecule per s (273–837 K). Previously, only one indirect experimental measurement at a single (ambient) temperature was available. The temperature dependence over an extended temperature range obtained in this study together with the peculiar V-shaped temperature dependence will have an impact on the modelling of the flame inhibition by phosphates as well on the further understanding of the mechanisms of elementary chemical reactions.
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spelling pubmed-86976782022-04-13 Kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 K temperature range Koshlyakov, P. V. Barkova, D. A. Gerasimov, I. E. Chesnokov, E. N. Zhang, Xiaokai Krasnoperov, L. N. RSC Adv Chemistry The kinetics of the reaction of hydroxyl radical (OH) with trimethyl phosphate (CH(3)O)(3)PO (TMP) (reaction (1)) OH + TMP → products (1) was studied at the bath gas (He) pressure of 1 bar over the 273–837 K temperature range. Hydroxyl radicals were produced in fast reactions of electronically excited oxygen atoms O((1)D) with either H(2)O or H(2). Excited oxygen atoms O((1)D) were produced by photolysis of ozone, O(3), at 266 nm (4(th) harmonic of Nd:YAG laser) over the 273–470 K temperature range and by photolysis of N(2)O at 193 nm (ArF excimer laser) over the whole temperature range including the elevated temperature range 470–837 K. The reaction rate constant exhibits a V-shaped temperature dependence, negative in the low temperature range, 273–470 K (the rate constant decreases with temperature), and positive in the elevated temperature range, 470–837 K (the rate constant increases with temperature), with a turning point at 471 K. The rate constant could be fairly well fitted with the three parameter modified Arrhenius expression, k(1) = 7.52 × 10(−18) (T/298)(9) exp(34 367 J mol(−1)/RT) cm(3) per molecule per s (273–837 K). Previously, only one indirect experimental measurement at a single (ambient) temperature was available. The temperature dependence over an extended temperature range obtained in this study together with the peculiar V-shaped temperature dependence will have an impact on the modelling of the flame inhibition by phosphates as well on the further understanding of the mechanisms of elementary chemical reactions. The Royal Society of Chemistry 2021-04-15 /pmc/articles/PMC8697678/ /pubmed/35423916 http://dx.doi.org/10.1039/d1ra00911g Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Koshlyakov, P. V.
Barkova, D. A.
Gerasimov, I. E.
Chesnokov, E. N.
Zhang, Xiaokai
Krasnoperov, L. N.
Kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 K temperature range
title Kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 K temperature range
title_full Kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 K temperature range
title_fullStr Kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 K temperature range
title_full_unstemmed Kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 K temperature range
title_short Kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 K temperature range
title_sort kinetics of the gas-phase reaction of hydroxyl radicals with trimethyl phosphate over the 273–837 k temperature range
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8697678/
https://www.ncbi.nlm.nih.gov/pubmed/35423916
http://dx.doi.org/10.1039/d1ra00911g
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