Abstract
The microporous structures of three Argonne Premium coals, and a weathered sample and three oxidized samples of Illinois No 6 coal (APCS No. 3), have been investigated by 129 Xe NMR spectroscopy. An analytical model has been developed which approximates the average pore sizes and pore swelling characteristics for the coals according to changes in 129 Xe chemical shifts as a function of xenon pressure. Pore regions can be described which differ in size (∼6 and ∼10 A in diameter) or chemical composition. The effects of weathering and oxidation at elevated temperatures on the pore size and swelling of Illinois No. 6 coal have also been examined
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