Abstract
Early studies that compared the adsorption of both carbon dioxide and methane in coals were done, principally, on bituminous coal samples from the United States and Canada. At normal reservoir temperatures, these coals were found to adsorb approximately twice the volume of carbon dioxide as methane. This two-to-one ratio has been widely reported in the literature, and has approached the status of conventional wisdom. In contrast, new adsorption isotherms determined on 13 samples of low-rank coals (lignite and subbituminous) from the Northern Great Plains and Texas demonstrate that these coals can adsorb from 6 to 18 times more carbon dioxide than methane.
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