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- W2073110898 abstract "The structural evolution of coals during coalification from peat to the end of the high volatile bituminous coal rank (VRr = 0.22–0.81%) has been studied using a natural maturity series from New Zealand. Samples were studied using a range of standard coal analyses, Rock–Eval analysis, infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), and pyrolysis gas chromatography (Py-GC). The structural evolution of coal during diagenesis and moderate catagenesis is dominated by defunctionalisation reactions leading to the release of significant amounts of oxygen and thereby to an enrichment of aromatic as well as aliphatic structures within the residual organic matter. Based on the evolution of pyrolysis yields and elemental compositions with maturity it can be demonstrated that oxygen loss is the major cause for increasing Hydrogen Index values or hydrocarbon generating potentials of coals at such maturity levels. For the first time, the loss of oxygen in form of CO2 has been quantified. During maturation from peat to high volatile bituminous coal ranks ∼10–105 mg CO2/g TOC has been released. This is equivalent to 2.50E−4 to 1.25E−3 mg CO2 generated from every litre of sediment per year falling into the range of deep biosphere utilisation rates. Immature coals, here New Zealand coals, therefore manifest the potential to feed deep terrestrial microbial life, in contrast to more mature coals (VRr > ∼0.81%) for which defunctionalisation processes become less important." @default.
- W2073110898 created "2016-06-24" @default.
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- W2073110898 date "2013-09-01" @default.
- W2073110898 modified "2023-10-16" @default.
- W2073110898 title "The structural evolution of organic matter during maturation of coals and its impact on petroleum potential and feedstock for the deep biosphere" @default.
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- W2073110898 doi "https://doi.org/10.1016/j.orggeochem.2013.06.011" @default.
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