High-Pressure CO2 Adsorption onto NaX Zeolite: Effect of Li+, K+, Mg2+, and Zn2+ and Equilibrium Isotherms Study

Document Type : Research Article


1 Materials Technology Laboratory, Houari Boumediene University of Science and Technology (USTHB), B.P. 32, El-Alia, Bab-Ezzouar, Algiers, ALGERIA

2 National School of Public Works(ENSTP), BP 32, Sidi Garidi Street, Kouba, Algiers, ALGERIA

3 Sustainable and Process Engineering Research Centre (SPERC) and department of Chemical & Environmental Engineering, Faculty of Engineering, University Putra Malaysia,43400 UPM Serdang, Selangor, MALAYSIA


Due to the adverse effects of Carbon dioxide (CO2) emissions on the environment; various mitigation is regulated to control its emissions. In this study, CO2 adsorption isotherms on NaX or Faujasite X and exchanged zeolites with  Li+ (LiX), Zn + (ZnX), Mg2+ (MgX), and K+ (KX) at different temperatures (298, 308, 323, 353, and 362 K) were investigated, using high pressure (3 MPa (30 bar)) thermogravimetric analyzer. The experimental results were then validated using numerous isotherm kinetics models namely Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Elovich, Toth, and Sips. From the study, it was found that the CO2 adsorption isotherms are characterized by a strong increase in low-pressure adsorption and a trend towards a high-pressure limit value Qmax. Specific surface area and pore volume revealed the most significant influent parameters for this study. These findings revealed that both experimental and modeling well correlated with Toth and Sips, gave the best results regardless of the material used.


Main Subjects

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