Introduction
Coal is a non-volatile, insoluble, non-crystalline, highly complex mixture of organic molecules of varying size and structure. The characterization of coal structure is challenging. A hypothetical model for a coal is shown below:
References:
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Tissot, B. and Welte, D.H. (1978) Petroleum Formation and Occurrence. Springer-Verlag, Berlin
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S. D. Killops, V. J. Killops, An Introduction to Organic Geochemistry, Longman Scientific & Technical ; New York : Wiley, 1993