High-Pressure CO۲ Adsorption onto NaX Zeolite: Effect of Li+, K+, Mg۲+, and Zn۲+ and Equilibrium Isotherms Study

Due to the adverse effects of Carbon dioxide (CO۲) emissions on the environment; various mitigation is regulated to control its emissions. In this study, CO۲ adsorption isotherms on NaX or Faujasite X and exchanged zeolites with  Li+ (LiX), Zn + (ZnX), Mg۲+ (MgX), and K+ (KX) at different temperatures (۲۹۸, ۳۰۸, ۳۲۳, ۳۵۳, and ۳۶۲ K) were investigated, using high pressure (۳ MPa (۳۰ 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 CO۲ 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.

کلیدواژه ها:

NaX zeolite ، Exchange cations ، LiX ، KX ، MgX and ZnX ، CO۲ Adsorption ، isotherme study