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PARAMETERS OF N2 AND CO2 ADSORPTION ONTO COAL AT VARIOUS TEMPERATURES

Anna Pajdak

Abstract

Adsorption of CO2 and N2 onto coal is used to describe its porous structure. It is mainly CO2 that allows for the analysis of the adsorption on coal, whose porous structure is dominated by micropores. Depending on the specificity of the transition process of CO2 molecules from the free state to the adsorbed state, the thermal characteristics of the adsorption process varies as well. The article presents the test results of three types of coal from Polish mines. The researcher carried out volumetric analyses of gas adsorption of coal in the pressure range of 0?0.1 MPa. The two gases were used as adsorbates: N2 (77K) and CO2 at various temperatures (258?298K). The following structural parameters of coal were determined: sorption capacity, pore size and volume and the thermal effect accompanying adsorption. The analyzed coal samples had well developed microporous structure and a high adsorption capacity in relation to CO2. The best CO2 sorption properties (258K) were recorded for the coal from ZG Sobieski: sorption capacity equal to 33.4 cm3/gSTP and the pore volume ? 0.048 cm3/g. For the remaining coal samples the author determined the sorption capacity (258K) which was in the range of 21.0?21.9 cm3/gSTP and the pore volume was in the range of 0.028-0.031 cm3/g. The author determined the isosteric heat of CO2 adsorption curves. It was shown that the energy connected with adsorption on coal from ZG Sobieski is the highest.

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