Developments in high-resolution solid-state13C NMR spectroscopy of coals |
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| Authors: | Michael A Wilson Anthony M Vassallo |
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| Institution: | CSIRO Division of Fossil Fuels, P.O. Box 136, North Ryde, N.S.W., 2113, Australia |
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| Abstract: | The recent development of “second generation” NMR experiments on coals is discussed in this paper. Such experiments have three aims: (1) To determine the extent to which quantitative aromaticity measurements can be made on coals by cross polarization-magic angle spinning (CP/MAS); (2) To obtain more detailed information on coal structure and reactivity than that given by the simple aromaticity measurements possible at the time; (3) To follow reaction pathways when coal is chemically modified. In this plenary lecture the relevant literature is reviewed, and new experimental work in all three areas outlined above is reported. Experimental evidence is presented which shows that aromaticity measurements on a bituminous coal by cross polarization (CP) or single pulse techniques give identical results. Relaxation data for naphthalene polymers suggest that these structures in coal are seen in CP experiments. Dipolar dephasing experiments suggest that the average size of the coal vitrinite molecule does not increase with increase in coal rank due to aromatic substitution reactions. Various relaxation experiments demonstrate how different carbon types can be distinguished in both13C-labelled and unlabelled coals. |
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| Keywords: | solid-state NMR coal structure |
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