Abstract
The enthalpies of adsorption of helium and carbon dioxide on a series of coals from subbituminous to anthracite were determined by the calorimetric method at 303 K. The results indicate that the enthalpy effects of helium adsorption on coals are much higher than expected (from −35 to −67 kJ mol −1) and the duration of these processes is relatively long (10–20 h). The adsorption effects are highly influenced by helium persorption. It is possible that the adsorption of helium atoms modifies the coal structures. To some extent the same processes were observed for adsorption of CO 2.
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