Carbon Isotope Fractionation during Oxidation of Light Hydrocarbon Gases
1990; American Chemical Society; Linguagem: Inglês
10.1021/bk-1990-0429.ch032
ISSN1947-5918
AutoresYasuhiro Kiyosu, H. R. Krouse, Christian A. Viau,
Tópico(s)Methane Hydrates and Related Phenomena
ResumoRelative enrichments of 13C in light hydrocarbon gases imply that they have served as thermochemical sulfate reducing agents during the production of H2S in some deep Paleozoic carbonate reservoirs of western Canada. This hypothesis was tested with laboratory measurements of carbon isotope selectivity during oxidation of light hydrocarbons. Although some experiments were carried out with sulfate as the oxidant, the accompanying slow reaction rates prompted the use of metal oxides. In flow and sealed tube experiments, 12CH4 was oxidized 1.021 to 1.011 times faster than 13CH4 over the temperature range 300 to 900°C. In sealed tube experiments, product CO2 was depleted in 13C by 8 and 4‰ with respect to reactants C2H6 and C3H8 respectively in the temperature range 300 to 400°C. CH4, relatively enriched in 13C, was produced as an intermediate during C2H6 oxidation.
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