Abstract
Isotope tracer experiments prove the role of methyl in the oxidative coupling of methane and disprove a recently proposed mechanism involving methylene. The ethane product from oxidative coupling of CH4/CD4 mixtures over a Li/MgO catalyst consists of C2H6, C2D6 and CH3CD3 thus proving that ethane is formed by combination of methyl intermediates. The co-reaction of labelled CH4 (D and13C) with C2H4 produces propylene labelled predominantly at the methyl (3) position, thus proving C3 formation by terminal addition of methyl to ethylene rather than via a cyclic intermediate as has been proposed.
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Mims, C.A., Hall, R.B., Rose, K.D. et al. Oxidative dimerization of CH4/CD4 mixtures: Evidence for methyl intermediate. Catal Lett 2, 361–368 (1989). https://doi.org/10.1007/BF00768178
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DOI: https://doi.org/10.1007/BF00768178