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RATE CONSTANTS FOR THE GAS-PHASE REACTIONS OF A SERIES OF C3-C6 ALDEHYDES WITH OH AND NO3 RADICALS. (R825252)
Citation:
Papagni, C., J. Arey, AND R. Atkinson. RATE CONSTANTS FOR THE GAS-PHASE REACTIONS OF A SERIES OF C3-C6 ALDEHYDES WITH OH AND NO3 RADICALS. (R825252). International Journal of Chemical Kinetics. John Wiley and Sons Ltd, New York, 32:79-84, (2000).
Description:
By using relative rate methods, rate constants for the gas-phase reactions of OH and NO3 radicals with propanal, butanal, pentanal, and hexanal have been measured at 296 ? 2 K and atmospheric pressure of air. By using methyl vinyl ketone as the reference compound, the rate constants obtained for the OH radical reactions (in units of 10-12 cm3 molecule-1 s-1) were propanal, 20.2 ? 1.4; butanal, 24.7 ? 1.5; pentanal, 29.9 ? 1.9; and hexanal, 31.7 ? 1.5. By using methacrolein and 1-butene as the reference compounds, the rate constants obtained for the NO3 radical reactions (in units of 10-15 cm3 molecule-1 s-1) were propanal, 7.1 ? 0.4; butanal, 11.2 ? 1.5; pentanal, 14.1 ? 1.6; and hexanal, 14.9 ? 1.3. The dominant tropospheric loss process for the aldehydes studied here is calculated to be by reaction with the OH radical, with calculated lifetimes of a few hours during daytime.