Gas adsorption kinetics in activated carbon

摘要

Gas adsorption kinetics in porous activated carbon is modeled using a nonisothermal, nonisobaric Maxwell-Stefan model. Mass transfer is described by three mechanisms: pore diffusion (molecular and Knudsen diffusion), viscous flow and surface diffusion. To distinguish between the different types of transport in the porous particles two types of kinetic uptake measurements were performed; responses to carbon dioxide pressure steps and responses to concentration steps of carbon dioxide at constant feed pressure. The unknown transport parameter, the surface diffusion coefficient, was determined by fitting the model to both types of experiments.