Abstract
Carbon aromaticities for a selection of 19 bituminous coals and vitrinite concentrates have been obtained by solid-state 13C n.m.r. using the inherently quantitative single pulse excitation technique. Within experimental error, the aromaticity values in the range 0.75–0.90 correlate extremely well with the H C ratios ( A 2 = 0.93); the 11 samples investigated with H C ratios between 0.74 and 0.77 all have aromaticities in the range 0.75–0.81. Furthermore, the correlation holds for the coals investigated with high inertinite contents.
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