Abstract

There is currently interest in the chemical characterization of kerogens, primarily for better understanding of the origin, chemical history, and classifications of these materials. Recently developed methods for obtaining high-resolution ¹³C and ¹H NMR spectra of solids have been exploited in structural characterization of kerogens. In particular, ¹³C CP/MAS spectroscopy has been extensively used in coal and kerogen studies to determine the aromatic/alkenic (or <i>sp</i>²-hybridized) fraction (<i>f</i>_<i>a</i>) of total carbon that comprises aromatic/alkenic structures. Such calculations are based on the integrated intensities of the aromatic/alkenic and aliphatic envelopes of ¹³C NMR spectra.

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