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• W2005228001 abstract "Diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy was applied to study the structure of vitrinites, liptinites and fusinites isolated from different rank coals (77.0–91.5%C) using a centrifugal float–sink procedure. Among the macerals separated from a given coal, liptinites are characterized by the highest proportion of aliphatic CH groups, occurring principally as CH2, and fusinites by the most aromatic structure. Macerals separated from the low rank coals show comparable content of hydroxyl groups that occur as free OH or form similar types of hydrogen bonds. Carbonyl groups appear not only as conjugated ketones and quinones in vitrinites, but also as carboxylic groups in liptinites and low rank fusinites. CHar/CHal ratio does not vary with carbon content in liptinites, but increases in vitrinites and fusinites. In the case of liptinites and vitrinites, a linear relationship between CHar/CHal and reflectance is observed up to vitrinite R0 value of 1.80%. For all macerals, the ratio CHar/CC increases with reflectance, but at different rates. Structural parameters CHar/CHal and CHar/CC calculated from DRIFT spectra are very helpful in monitoring the differences among macerals of given coal and following structural rearrangement occurring with rank." @default.
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• W2005228001 date "2002-01-01" @default.
• W2005228001 modified "2023-09-30" @default.
• W2005228001 title "The characterization of coal macerals by diffuse reflectance infrared spectroscopy" @default.
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• W2005228001 doi "https://doi.org/10.1016/s0016-2361(01)00125-9" @default.
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