Carbon isotope effect during abiogenic oxidation of methane
Carbon isotope effect during abiogenic oxidation of methane
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DOI：
10.1016/0012-821x(89)90105-2
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发表时间：
1989-11
影响因子：
5.3
通讯作者：
Y. Kiyosu;H. Krouse
中科院分区：
文献类型：
--
作者：
Y. Kiyosu;H. Krouse
在400-650°C的温度范围内，研究了甲烷在流过CuO和Fe_2 O_3时的氧化。反应速率和碳同位素分馏取决于氧化物和温度的选择。赤铁矿的活化能（8.0 kcal mole−1）低于氧化铜的活化能（16.6 kcal mole−1）。同位素速率常数α =k12/k13与温度的关系为：103（α − 1）=2.93 × 106/T2+ 8.11（氧化铜）103（α − 1）=7.44 × 106/T2+ 6.56（赤铁矿）甲烷的非生物氧化可能是自然界中碳同位素分馏的重要机制。
The oxidation of methane during flow over CuO and Fe2O3has 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 constantsα =k12/k13were 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.