Determination of pore size distribution in microporous carbons based on CO2 and H2 sorption data

A method for the determination of pore size distribution (PSD) is applied in the case of AX-21 carbon. Adsorption isotherms of CO2 (253, 298K) and H2 (77 K) up to 20 bar have been measured, while the computed isotherms resulted from GCMC simulations. The optimal PSD is determined by inverting the adsorption integral equation. Such PSDs were used to predict isotherms of other adsorbates and temperatures. Best predictions were obtained by employing the full relative pressure range PSD (CO2 at 253 K). In addition, optimal PSDs were deduced from the combined use of CO2 and H2 data. These were found to be capable of reproducing more accurately all the available experimental isotherms.