SORPTION OF NITROGEN, METHANE, CARBON-DIOXIDE AND THEIR MIXTURES ON BITUMINOUS COALS AT IN-SITU CONDITIONS

Sorption data are presented for N-2, CH4, CO2 and their mixtures on se veral bituminous coals. The data are used to interpret the application of the Langmuir sorption isotherm to coals. The Langmuir constants sh ow variations consistent with sorbate molecular properties and changes in coal rank; differences in limiting sorption values amongst sorbate s are interpreted with the Gurvitsch rule. Deviations from the Lewis r ule are used to infer the usefulness of the mixture formulation of the Langmuir isotherm.