Adsorption Properties of Carbon Molecular Sieves Prepared by a Co-carbonization Process

Carbon molecular sieves (CMSs) are microporous carbon materials whose special textural characteristics enable kinetic separation of gas mixtures, i.e., separation as a result of differences in the diffusion rates of the species involved. For a CMS to be useful for gas separation, it must possess a narrow pore size distribution (PSD) consisting of pore mouths of molecular sizes and a relatively high micropore volume, features which confer them selectivity and capacity, respectively [1]. Besides, it must show high adsorption and desorption absolute rates, as the performance for PSA cycles designed for kinetic separation is usually optimal for cycles with short time duration [2,3].