Thermodynamics and Kinetics of CO2 Adsorption on Nanoporous Wv1050 Activated Carbon at 20°c and Pressures Up to 35 Bar

Abstract

Thermodynamic and kinetic investigations are essential to understanding the mechanisms involved in adsorbent-adsorbate interaction and evaluating adsorption capacity and time to achieve separation. In this study, the adsorption equilibrium isotherm and the adsorption kinetics of pure CO₂ on WV1050, a granular commercial activated carbon, were investigated experimentally in a gas sorption analyzer coupled with a magnetic suspension at 20 °C and pressures up to 35 bar. Using a volumetric apparatus, the adsorption equilibrium isotherm determined agrees with previously measured isotherm data. The adsorption kinetics was modeled using the experimental equilibrium data measured and GNU Octave software for pseudo-first order, pseudo-second order, and Avrami models. The best results were provided by the Avrami model, which usually presents a time-dependent adsorption rate coefficient. Further studies are underway to use this model in the simulation and design of the gas adsorption bed.