This paper presents adsorption isotherm data of CO 2 onto two different types of highly porous activated carbons (ACs) for temperatures ranging from (À18 to 80) °C and pressures up to 10 MPa. The assorted adsorbents are activated carbon fiber (ACF) of type A-20 and activated carbon powder of type Maxsorb III. Adsorption isotherm data have been obtained using a volumetric technique and fitted to the DubininÀAstakhov (DÀA), T oth, Langmuir, and modified DÀA equations. The latter considers the pseudosaturation pressure of CO 2 that plays an important role for supercritical gas adsorption, and the pseudosaturation pressure was determined from the experimental data. The T oth and modified DÀA isotherms correlate with the experimental data within 5 % root-mean-square deviation (rmsd) and present a better fitting than that of the Langmuir and the DÀA equations. The isosteric heat of adsorption data were derived from the T oth and modified DÀA isotherm equations and the correlation proposed by Chakraborty et al., and the average heat of adsorption values were found to be comparable. These data are essential for designing CO 2 -based adsorption cooling, refrigeration, and gas storage systems.

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