bIllinois State Geological Survey

Pore size distribution (PSD) of microporous carbon is often associated with studies on gas separation and storage by physical adsorption, and heterogeneous catalysis. Many methods have been proposed to determine the PSD based on N2 77 K adsorption isotherm. Typical examples are MP (by Mikhail et al.), JC (Jaroniec and Choma), HI ( (Horvath and Kawazoe) and SNAP (by Seaton et al.) methods. ~'2 In this paper, an alternative way is proposed to calculate the PSD of three select activated carbon fibers (ACFs) using a model adsorption isotherm equation derived from statistical mechanical principles. Modeling results are compared with those obtained by three typical methods: MP, JC and HK. N2 77 K adsorption isotherms (Fig 1) for ACFs were taken from Cal. a The Isotherm Equation and PSD Determination The semi-empirical DR and DA equations have been use