Shock Tube Investigation
of CH<sub>3</sub> + CH<sub>3</sub>OCH<sub>3</sub>
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Abstract
The title reaction has been investigated in a diaphragmless
shock
tube by laser schlieren densitometry over the temperature range 1163–1629
K and pressures of 60, 120, and 240 Torr. Methyl radicals were produced
by dissociation of 2,3-butanedione in the presence of an excess of
dimethyl ether. Rate coefficients for CH<sub>3</sub> + CH<sub>3</sub>OCH<sub>3</sub> were obtained from simulations of the experimental
data yielding the following expression which is valid over the range
1100–1700 K: <i>k</i> = (10.19 ± 3.0)<i>T</i><sup>3.78</sup> exp<sup>(−4878/T)</sup> cm<sup>3</sup> mol<sup>–1</sup>s<sup>–1</sup>. The experimental
results are in good agreement with estimates by Curran and co-workers
[Fischer, S. L.; Dryer, F. L.; Curran, H. J. <i>Int. J. Chem.
Kinet.</i> <b>2000</b>, <i>32</i> (12), 713–740.
Curran, H. J.; Fischer, S. L.; Dryer, F. L. <i>Int. J. Chem.
Kinet.</i> <b>2000</b>, <i>32</i> (12), 741–759]
but about a factor of 2.6 lower than those of Zhao et al. [Zhao, Z.;
Chaos, M.; Kazakov, A.; Dryer, F. L. <i>Int. J. Chem. Kinet.</i> <b>2008</b>, <i>40</i> (1), 1–18]