The products of the reaction of a CH4/CD4/O2 mixture over a Li-promoted MgO (Li/MgO) catalyst at 750°C have been determined by mass spectrometry and high-resolution Fourier transform infrared spectroscopy. Under these conditions there was no significant hydrogen exchange between CH4 and CD4. C2H6, CD3CH3, and C2D6 were the only ethanes detected, and C2H4, CD2CH2, and C2D4 were the only ethylenes. The relative concentrations of the hydrocarbon products could be predicted on the basis of the relative concentrations of CH3 and CD3 determined by the kinetic isotope effect. The results suggest that the reaction proceeds almost exclusively by gas-phase methyl coupling and that ethylene is produced by gas-phase conversion of ethane.
|Number of pages||4|
|Journal||Journal of Physical Chemistry|
|Publication status||Published - 3 Nov 1988|