Shock Tube Measurement of the CH3+C2H6→CH4+C2H5 Rate Constant.

Abstract

The rate constant for the reaction CH3+C2H6→CH4+C2H5 was studied behind reflected shock waves at temperatures between 1369 and 1626 K and pressures from 8.6 to 47.4 atm in mixtures of methane, ethane and argon. Ethylene time-histories were measured using laser absorption of radiation from a carbon dioxide gas laser near 10.532 microns. The resulting rate constant data can be represented by the Arrhenius equation k (T) = 3.90×1013 exp(-16670 cal/mole/RT) cm3mole-1s-1. We believe this is the first study to extend experimental data for this rate constant to temperatures above 1400 K. The overall 2\uf073 uncertainty of the current data is +18%/-21% resulting primarily from uncertainties associated with the influence of secondary reactions and the fitting of rapidly changing species time-histories at the higher temperatures.