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- W2495036791 abstract "Chemical analyses restricted to a single coal maceral permit a focus on rank effects without concern for variations in organic matter type. Vitrinite concentrates of high purity were isolated from coal samples of the Lower Kittanning seam by multi-step density gradient centrifugation, with reflectances ranging from 0.66 to 1.39% Rmax. In addition to the previously recognized losses of phenolic compounds, the vitrinite pyrolyzates exhibit marked increases in relative concentrations of tri- and tetraaromatic hydrocarbons (especially benzo[a]fluorene, methyl-phenanthrenes, methylfluorenes and methylchrysenes) above 0.9% Rmax, i.e., beyond the second coalification jump of Teichmüller (1). Thus, petrographically-recognizable physical transformations are shown to correspond to a major chemical restructuring of the vitrinite. Increases in rank also correspond to systematic variations in the distributions of the isomers of various polyaromatic compounds in the flash pyrolyzates, which can be exploited in the creation of indicators covering a wide range of thermal maturation." @default.
- W2495036791 created "2016-08-23" @default.
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- W2495036791 date "1994-11-09" @default.
- W2495036791 modified "2023-09-25" @default.
- W2495036791 title "Flash Pyrolysis—Gas Chromatography—Mass Spectrometry of Lower Kittanning Vitrinites" @default.
- W2495036791 doi "https://doi.org/10.1021/bk-1994-0570.ch009" @default.
- W2495036791 hasPublicationYear "1994" @default.
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