Adsorption of CO2, CH4 and H2 onto zeolite 13 X: Kinetic and equilibrium studies
Hedi Jedli, Souhail Bouzgarrou, Rym Hassani, Ehab Sabi, Khalifa Slimi
Abstract
Adsorption equilibrium and kinetics of CO 2 , H 2 and CH 4 on zeolite 13 X were carried out using the volumetric method. The zeolite 13 X was characterized via XRD, SEM and N 2 adsorption-desorption. Adsorption isotherms of various gas were investigated over a full range of temperatures at 298, 308 and 313 K. Langmuir's equilibrium model and the heat of adsorption was used to correlate the adsorption isotherms over a wide range of pressure. A classical micropore diffusion approach was applied to investigate the kinetic adsorption. At 298 K, the selectivity of CO 2 /H 2 and CO 2 /CH 4 of the zeolite 13 X was 16.52 and 62.61, respectively. However, zeolite 13 X is one of the most suitable adsorbents for CO 2 and CH 4 storage, since it has a very high adsorption capacity for both gases. The influence of gas pressure on diffusivity for various absorber-adsorbent systems has been examined. The adsorption experiments with gas mixtures such as H 2 , CO 2 and CH 4 on 13 X zeolite show that this adsorbent has potential application in the gas separation and purification process.