Carbon-13 NMR spectra of macerals separated from individual coals |
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| Authors: | Ronald J Pugmire Kurt W Zilm Warner R Woolfenden David M Grant Gary R Dyrkacz Carol AA Bloomquist EPhillip Horwitz |
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| Institution: | University of Utah, Salt Lake City, UT 84112, U.S.A.;Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A. |
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| Abstract: | The density gradient centrifugation technique has recently been applied to the separation of macerals from whole coals. Sufficient quantities have been separated to permit examination of pure exinite, vitrinite and inertinite fractions by combined cross polarization and magic angle sample spinning (CP/MASS) carbon-13 NMR techniques. The similarities and differences observed in the maceral groups of two coals are discussed. Diversity in precursors or in differential chemical maturation or a combination of both of these factors can be used to account for subtle spectral differences in the two coals and macerals studied even though the gross spectral features are very similar for a given maceral type. The data show that CP/MASS is a technique that can address such interesting geochemical questions. |
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