Petrological and spectroscopic structural characteristics of Bohemian and Moravian coals and their possible relation to gas proneness

Abstract Optical and infra-red microscopy, diffusion reflectance infra-red spectrometry and solid-state nuclear magnetic resonance spectrometry (13C CP/MAS NMR) were applied to the determination of the degree of coalification and structural characteristics of lignite and bituminous coal from deposits in the Czech Republic. Structural parameters such as the aliphatic and aromatic contents and carbonyl contents of coal and coal macerals could be valuable tools for determination of gas proneness, e.g. the CH2/CH3 ratio derived from infra-red spectroscopy. Aromaticity, fa, determined by 13C CP/MAS NMR, is shown to be a valuable parameter reflecting the degree of coalification, particularly for low and middle rank coal, thus supplementing data derived from the vitrinite reflectance Ro and (H/C)at ratio data. The maceral group of huminite/vitrinite mirrored similar changes with increasing coalification degree as the parent coal. The structure of two macerals of the liptinite group, sporinite and cutinite, was investigated for bituminous coal, and the aromatic and oxygen group contents were higher in cutinite than in sporinite.

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