Carbon isotope effect during abiogenic oxidation of methane

Details Carbon isotope effect during abiogenic oxidation of methane Carbon isotope effect during abiogenic oxidation of methane

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..95..302k&link_type=abstract

Earth and Planetary Science Letters, Volume 95, Issue 3-4, p. 302-306.

Physics

2

Scientific paper

The oxidation of methane during flow over CuO and Fe2O3 has been examined in the temperature range of 400-650°C. The reaction rate and carbon isotope fractionation are dependent upon the choice of oxide and temperature. The activation energy is lower for hematite (8.0 kcal mole-1) than for cupric oxide (16.6 kcal mole-1). The measured ratios of the isotopic rate constants α = k12/k13 were found to have temperature dependences given by: 103(α - 1) = 2.93 × 106/T2 + 8.11 (cupric oxide) 103(α - 1) = 7.44 × 106/T2 + 6.56 (hematite)
Abiogenic oxidation of methane is probably a significant mechanism for fractionating carbon isotopes in nature.

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