Presentation Title

Kinetics study of 3-ethyltoluene + OH at 298K and 1-8 Torr using the relative rate/discharge flow/mass spectrometry technique

Faculty Mentor

Zhuangjie Li

Start Date

18-11-2017 12:30 PM

End Date

18-11-2017 1:30 PM

Location

BSC-Ursa Minor 142

Session

Poster 2

Type of Presentation

Poster

Subject Area

physical_mathematical_sciences

Abstract

The kinetics of the reaction of 3-ethyltoluene with hydroxyl radical has been studied at 298K and a total pressure of 1-8 Torr using the relative rate/discharge flow/mass spectrometry (RR/DF/MS) technique with n-nonane as a reference. The rate constant of k3-ethyltoluene+OH at 298 K was determined to be (1.48 ± 0.10) × 10-11 , (1.85 ± 0.14) × 10-11, (1.93 ± 0.14) × 10-11, and (1.97 ± 0.15) × 10-11 cm3 molecule–1 s–1 at 1 Torr, 3 Torr, 5 Torr, and 8 Torr, respectively. Our kinetics results indicate that the rate constant increases with pressure at 1-5 Torr and level off at 5-8 Torr, which suggests that at 298 K the reaction of m-ethyltoluene with hydroxyl radicals proceeds with addition of OH to the m-ethyltoluene molecule, and a high pressure limit has been reached at 5 Torr. Within experimental uncertainty our kinetics results are consistent with that reported by Lloyd et al. who studied the same reaction using the traditional relative rate technique.

Summary of research results to be presented

Kinetic data of 3-ethyltoluene and hydroxyl radical at 1-8 Torr and 298K using relative rate/discharge flow/mass spectrometry using n-nonane as a reference

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Nov 18th, 12:30 PM Nov 18th, 1:30 PM

Kinetics study of 3-ethyltoluene + OH at 298K and 1-8 Torr using the relative rate/discharge flow/mass spectrometry technique

BSC-Ursa Minor 142

The kinetics of the reaction of 3-ethyltoluene with hydroxyl radical has been studied at 298K and a total pressure of 1-8 Torr using the relative rate/discharge flow/mass spectrometry (RR/DF/MS) technique with n-nonane as a reference. The rate constant of k3-ethyltoluene+OH at 298 K was determined to be (1.48 ± 0.10) × 10-11 , (1.85 ± 0.14) × 10-11, (1.93 ± 0.14) × 10-11, and (1.97 ± 0.15) × 10-11 cm3 molecule–1 s–1 at 1 Torr, 3 Torr, 5 Torr, and 8 Torr, respectively. Our kinetics results indicate that the rate constant increases with pressure at 1-5 Torr and level off at 5-8 Torr, which suggests that at 298 K the reaction of m-ethyltoluene with hydroxyl radicals proceeds with addition of OH to the m-ethyltoluene molecule, and a high pressure limit has been reached at 5 Torr. Within experimental uncertainty our kinetics results are consistent with that reported by Lloyd et al. who studied the same reaction using the traditional relative rate technique.