Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 35, Issue -, Pages 283-290Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2014.05.006
Keywords
Low-temperature ignition; Propane oxidation; Master equation; Direct dynamics; Non-Boltzmann effects
Funding
- Division of Chemical Sciences, Geosciences, and Biosciences, the Office of Basic Energy Sciences, the U.S. Department of Energy as part of the Argonne-Sandia Consortium on High-Pressure Combustion Chemistry (FWP) [DE-AC04-94-AL85000, 59044]
- Argonne Director's Postdoctoral Fellowship
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The decomposition of ketohydroperoxides (OQ'OOH) to two radicals is commonly predicted to be the key chain branching step in low-temperature combustion. The possibility of a direct decomposition of the OQ'OOH from its initially produced energy distribution is studied with a combination of master equation (ME) and direct trajectory simulations. The temperature and pressure dependent rate constants for the thermal decomposition of a ketohydroperoxide, HOOCH2CH2CHO, to four product channels were computed using RRKM/ME methods. Direct dynamics calculations were initiated from a transition state in the O-2 + QOOH reaction network to understand the fraction of energy in that transition state that is converted into the internal energy of the OQ'OOH. A novel approach to solving the master equation is used to determine the probability that a vibrationally hot OQ'OOH either will be stabilized to a thermal distribution or will react to form new products. Under most conditions, the majority of vibrationally excited OQ'OOH will be quenched into a thermal distribution. At higher internal energies and lower pressures, however, a significant fraction of the hot OQ'OOH will decompose rather than thermalize. Proper interpretation of low-pressure experiments may require inclusion of vibrationally hot intermediates, particularly if a chemical kinetic mechanism is optimized against the low-pressure data. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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