Experimental, Kinetics and Isotherm Modeling of Carbon Dioxide Adsorption with 13X Zeolite in a fixed bed column

In this work, zeolite 13X with a porosity structure has been used as an adsorbent for adsorption of CO2 flue gas. The effects of operating conditions, including pressure and time, on adsorption capacity were investigated. The experimental conditions include constant temperature, the range of pressure of 1-9 bars, and the registration of adsorption capacity with the passage of time. Experimental data were adjusted with adsorption isotherm models including two- and threeparameter isotherms. In addition, the process was studied in terms of kinetic models; after the implementation of the experimental data with kinetic models, the speed of the process equations was obtained. The first-order equation was selected as the best kinetic model for this process. The results showed that the adsorption capacity of 13X was 71.5 mg/g at a pressure of 8 bars. Also, the results indicate that 13X has a high capacity at low pressures. With regard to achieved results for adsorption isotherm modeling, the adsorption isotherm followed the three parameters and, among the three-parameter models, Toth isotherm can interpret the process. Also, the results of the fixed bed indicate very high adsorbent selectivity to carbon dioxide adsorption, and there is little oxygen and nitrogen adsorption