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Carbon isotope effect during abiogenic oxidation of methane

1989; Elsevier BV; Volume: 95; Issue: 3-4 Linguagem: Inglês

10.1016/0012-821x(89)90105-2

1385-013X

Yasuhiro Kiyosu, H. R. Krouse,

CO2 Sequestration and Geologic Interactions

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.