Adsorption on Kureha activated carbon: Isotherms and kinetics

Adsorption equilibria and kinetics of butane isomers in Kureha activated carbon were investigated using a volumetric method and the tapered element oscillating microbalance (TEOM). The isotherm data measured by the TEOM technique are in good agreement with those determined by the volumetric method. The Toth model appropriately describes the equilibrium data. The model used to describe the desorption profiles determined with the TEOM is based on the overall transport kinetics controlled by both micropore diffusion and mass transfer across the gas film around the adsorbent particles. The conventional Darken relation fails to capture the concentration-dependent diffusion in Kureha carbon. Alternatively, the structural model proposed by Do (1996) well describes this stronger concentration-dependent micropore diffusion.