Atmospheric Chemistry of Tetrahydrofuran, 2-Methyltetrahydrofuran, and 2,5-Dimethyltetrahydrofuran: Kinetics of Reactions with Chlorine Atoms, OD Radicals, and Ozone

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

FTIR smog chamber techniques were used to study the kinetics of the gas-phase reactions of Cl atoms, OD radicals, and O3 with the five-membered ring-structured compounds tetrahydrofuran (C4H8O, THF), 2-methyltetrahydrofuran (CH3C4H7O, 2-MTHF), 2,5-dimethyltetrahydrofuran ((CH3)2C4H5O, 2,5-DMTHF), and furan (C4H4O). The rate coefficients determined using relative rate methods were kTHF+Cl = (1.96 ± 0.24) × 10-10, kTHF+OD = (1.81 ± 0.27) × 10-11, kTHF+O3 = (6.41 ± 2.90) × 10-21, k2-MTHF+Cl = (2.65 ± 0.43) × 10-10, k2-MTHF+OD = (2.41 ± 0.51) × 10-11, k2-MTHF+O3 = (1.87 ± 0.82) × 10-20, k2,5-DMTHF+OD = (4.56 ± 0.68) × 10-11, k2,5-DMTHF+Cl = (2.84 ± 0.34) × 10-10, k2,5-DMTHF+O3 = (4.58 ± 2.18), kfuran+Cl = (2.39 ± 0.27) × 10-10, and kfuran+O3 = (2.60 ± 0.31) × 10-18 molecules cm-3 s-1. Rate coefficients of the reactions with ozone were also determined using the absolute rate method under pseudo-first-order conditions. OD radicals, in place of OH radicals, were produced from CD3ONO to avoid spectral overlap of isopropyl and methyl nitrite with the reactants. The kinetics of OD radical reactions are expected to resemble the kinetics of OH radical reactions, and the rate coefficients of the reactions with OD radicals were used to calculate the atmospheric lifetimes with respect to reactions with OH radicals. The lifetimes of THF, 2-MTHF, and 2,5-DMTHF are approximately 15, 12, and 6 h, respectively.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • University of Copenhagen
  • California State University Northridge
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysik
Originalspråkengelska
Sidor (från-till)7320-7326
Antal sidor7
TidskriftThe Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
Volym120
Utgåva nummer37
StatusPublished - 2016 sep 22
PublikationskategoriForskning
Peer review utfördJa