TITLE:
Vibrational Nonequilibrium in the Hydrogen-Oxygen Reaction at Different Temperatures
AUTHORS:
Oleg V. Skrebkov
KEYWORDS:
Gas Phase, Hydrogen-Oxygen Reaction, Chemical Kinetics, Vibrational Relaxation, Electronically Excited States
JOURNAL NAME:
Journal of Modern Physics,
Vol.5 No.16,
October
30,
2014
ABSTRACT: A theoretical
model of chemical and vibrational kinetics of hydrogen oxidation is suggested based
on the consistent account for the vibrational nonequilibrium of HO2 radical which forms in result of bimolecular recombination H + O2 =
HO2 in the vibrationally excited state. The chain branching H + O2 = O + OH and inhibiting H + O2 + M = HO2 + M formal
reactions are considered (in the terms of elementary processes) as a general
multi-channel process of forming, intramolecular energy redistribution between modes,
relaxation, and monomolecular decay of the comparatively long-lived
vibrationally excited HO2 radical which is capable to react and
exchange of energy with another components of the mixture. The model takes into
account the vibrational nonequilibrium for the starting (primary) H2 and O2 molecules, as well as the most important molecular
intermediates HO2, OH, O2(1D), and the main reaction product H2O.
The calculated results are compared with the shock tube experimental data for
strongly diluted H2-O2 mixtures at 1000 T p 2 radical acts as a key
intermediate in the principally important chain branching process. For T 2 radical is the essence of this process.