Characterization of Surface Area and Porosity in Coal by Gas and Vapor Adsorption.
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The objective of this investigation was to directly measure and evaluate any swelling effects that may be caused by co2 and other gases used in adsorption studies. Dilatometric studies were carried out on three coal specimens (kcer 7122, kcer 7259, and kcer 7463) in various gaseous environments. The kcer 7463 sample showed the maximum length increase to date (0.50%). This corresponds with a volume increase of 1.31%. Volume increases on the order of 9.2% Would account for the surface areas usually found by co2 adsorption on coal. However, the dilatometric studies have generally not reached equilibrium even after 280 h of exposure of co2. The 1.31% Volume increase value is thus probably a lower limit; a higher value should be obtained at equilibrium. A distinct effect of carbon content was observed on the swelling behavior. Results of these three coals indicate that a lower carbon content correlates with a higher degree of swelling. The order of swelling was kcer 7259 < 7122 < 7463.
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