Abstract
Using a range of inter-related techniques, it is shown that, although the total porosity and inherent moisture of coals are determined primarily by rank effects, systematic differences in pore size distribution between inertinite-rich and vitrinite-rich coals exist. In particular, inertinites contain more macroporosity (taken as 30 nm-10 μm diameter) and less microporosity (<2 nm) than their equivalent vitrinites. Identifying trends in macroporosity required that mercury porosimetry data should be corrected for simultaneous compressibility and pore filling. Resultant compressibility values have been shown to be related to the micropore volume determined by carbon dioxide adsorption. Carbon dioxide and water adsorption results suggest that greater surface interactions occur with these molecules in inertinites than in vitrinites.
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