Comparison of physical and chemical properties of maceral groups separated by density dradient centrifugation |
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| Authors: | Jirina Karas Ronald J Pugmire Warner R Woolfenden David M Grant Skeen Blair |
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| Institution: | 1. Department of Fuels Engineering, University of Utah, Salt Lake City, UT 84112, U.S.A.;2. Department of Chemistry, University of Utah, Salt Lake City, UT 84112, U.S.A. |
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| Abstract: | Eight coals have been selected for study of the physical and chemical properties of the maceral group . The density-gradient centrifugation technique was employed to affect maceral group separation. The maximum reflectance method of Ting and Lo was used for estimating the reflectance of very small coal particles. The reflectograms were used to characterize the separated maceral fractions. The density, elemental composition, reflectance, NMR parameters of aromaticity, protonated aromatic carbon content and ƒstuggeredastuggeredH of the maceral groups were compared. Variations in the aromatic structure of the maceral groups are discussed as well as the observation that ƒstuggereda and ƒstuggeredastuggeredH change with particle density. |
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| Keywords: | Individual to whom correspondence should be addressed |
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