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Kinetics and mechanism of the C2H5O2 + NO reaction: A temperature and pressure dependence study using chemical ionization mass spectrometry

✍ Scribed by Max W. Bardwell; Asan Bacak; M. Teresa Raventós; Carl J. Percival; Gabriela Sanchez-Reyna; Dudley E. Shallcross

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
122 KB
Volume
37
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The overall rate coefficient (k~1~) for the reaction of C~2~H~5~O~2~ + NO has been measured using the turbulent flow CIMS technique. The temperature dependence of the rate coefficient was investigated between 203 and 298 K. Across the temperature range, the experimentally determined rate coefficients showed good agreement with previous studies and were fitted using an Arrhenius type analysis to yield the expression k~1~ = (1.75) × 10^−12^ exp[(462 ± 19)/T] cm^3^ molecule^−1^ s^−1^. Experiments were carried out in the pressure range of 100–200 Torr within the stated temperature range, where the rate coefficients were shown to be invariant with pressure. The branching ratio of the reaction was also assessed as a function of temperature and was found to proceed 100 ± 5% via the C~2~H~5~O + NO~2~ reactive channel. This work represents the first temperature and pressure study over which the branching ratio has been studied. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: 253–260, 2005

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