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- W2079200776 abstract "Formaldehyde decay was followed by IR emission at 3.5 μm behind reflected shocks at total concentrations near 2.4 and 4.5×1018 molecule/cm3 in a 7.6 cm diameter shock tube. Data were obtained at 0.5 μs intervals over a temperature range of 1700–2710 K for mixtures containing 0.1%, 0.5%, and 1.0% CH2O in Ar. Exponential decay was observed in all cases; at lower temperatures there was evidence of an induction time prior to the onset of the decay. An apparent rate constant was defined as ka=−[d(In signal)/dt]/[M]; ka was observed to be independent of the total concentration but to decrease with decreasing CH2O concentration. These data were analyzed in terms of the mechanism: CH2O+M=HCO+H+M (1) CH2O+H=HCO+H2 (2) HCO+M=H+CO+M (3) HCO+H=H2+CO(4) (4) Using literature values for k2, k3, and k4, a reasonable fit to all the data, both in terms of temperature and concentration dependence, was obtained with k1=6.0×10−7 exp(−364 kJ/RT) cm3 molecule−1 s−1. Error considerations suggest this value of k1 is accurate to within a factor of three between 1800–2500 K. However, the uncertainty in the activation energy may be as high as 40–50 kJ/mole. Evidence is also presented to suggest that the reaction CH2O+M=CO+H2+M(1′) does not play a significant role in the high temperature pyrolysis of formaldehyde." @default.
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- W2079200776 date "1979-01-01" @default.
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- W2079200776 title "Shock tube studies of formaldehyde pyrolysis" @default.
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- W2079200776 doi "https://doi.org/10.1016/s0082-0784(79)80058-2" @default.
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