Shock Tube Studies of the N2O/CH4/CO/Ar and N2O/C2H6/CO/Ar Systems.
PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS
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Reflected shock waves were used to heat N2OC2H6COAr and N2OCH4COAr mixtures to temperatures of 1875-2855 K at total concentrations of 5 x 10 to the 18th power CC. Oxygen atom production was monitored via the flame band emission at 450 nm, and CO2 production was observed at 4.27 micrometers. These data were then compared to the results of numerical integration of the rate equations, using rate constant and mechanistic information obtained in earlier studies of H2 and CH2O under similar conditions. For the C2H6 mixture, it was possible to achieve good agreement between these calculations and the observed data using only one addition reaction 0 CH3 yileds CH2O OH. The calculations were insensitive to the precise value used, but the results are consistent with recent high temperature literature values. For the CH4 mixture, the best agreement was achieved using a recent high temperature value for O CH4 yields CH3 OH. The data indicated that this reaction has a markedly non-Arrhenius rate constant use of a value based upon low temperature data gives results inconsistent with those observed. The CH4 system was insensitive to any other methane reaction rate constant. There was some experimental evidence to suggest an unsuspected complexity in methyl radical decay channels at the lowest temperatures observed. The mechanismrate constant combination used here was then applied to the analysis of literature data for CH3 oxidation by O2. This analysis was designed to obtain a value for the rate constant of CH3 O2 yields CH2O OH.
- Atomic and Molecular Physics and Spectroscopy
- Combustion and Ignition