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Author(s):   Vakhtin, A.B.; Murphy, J.E.; Leone, S.R.
Title:   Low-temperature kinetics of reactions of OH radical with ethene, propene, and 1-butene
Journal:   J. Phys. Chem. A
Volume:   107
Page(s):   10055 - 10062
Year:   2003
Reference type:   Journal article
Squib:   2003VAK/MUR10055-10062

Reaction:   C2H4 + ·OH → Products
Reaction order:   2
Temperature:   96.00 - 296 K
Pressure:  1.90E11 - 3.25E13 bar
Rate expression:   8.75x10-12 [±7.04x10-13 cm3/molecule s] (T/298 K)(-0.85±0.11)
Bath gas:   N2
Category:  Experiment
Data type:   High or low pressure extrapolation
Pressure dependence:   Rate constant is pressure dependent
Experimental procedure:   Laval nozzle
Excitation technique:   Flash photolysis (laser or conventional)
Time resolution:   In real time
Analytical technique:   Laser induced fluorescence

From the Abstract:

The kinetics of the reactions of the OH radical with ethene (k1), propene (k2), and 1-butene (k3) are studied over a temperature range of T ) 96-296 K. The low-temperature environment is provided by a pulsed Laval nozzle supersonic expansion of nitrogen with admixed radical precursor and reactant gases. The OH radicals are produced by pulsed photolysis of H2O2 at 248 nm. Laser-induced fluorescence of the OH radicals is used to monitor the OH decay kinetics to obtain the bimolecularrate coefficients. At T = 296 K, the rate constants k1, k2, and k3 are also measured as a function of total pressure. The room-temperature falloff parameters are used as the basis for extrapolation of the low-temperature kinetic data, obtained over a limited range of gas number density, to predict the high-pressure limits of all three rate coefficients at low temperatures. All three high-pressure rate constants show a slight negative temperature dependence, which is generally in agreement with both low-temperature and high-temperature kinetic data available in the literature.

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Rate constant values calculated from the Arrhenius expression:

T (K)k(T) [cm3/molecule s]
96.00 2.29E-11
100 2.21E-11
125 1.83E-11
150 1.57E-11
175 1.38E-11
200 1.23E-11
225 1.11E-11
250 1.02E-11
275 9.37E-12
296 8.80E-12