Adsorption is an effective method for separating CO2 from flue gases. The fixed-bed adsorption and desorption of CO2 on MCM-41 and amine-modified MCM-41 (APTS-MCM-41) were studied. The dual-site Langmuir model, which considered both chemical adsorption and physical adsorption, was used to fit the experimental data. The resulting thermodynamic parameters, such as the saturated adsorption capacity, equilibrium constant, enthalpy and entropy, suggested the feasibility of the CO2 adsorption on APTS-MCM-41, as well as the reality of the adsorption mechanism. A dynamic model based on the linear driving force approximation for the mass transfer was used to describe the adsorption kinetics of CO2. The influences of the operating conditions on the breakthrough curve were investigated using both experimental and theoretical methods. Meanwhile, the impacts of changing values of the axial dispersion coefficient and the mass transfer coefficient were investigated. It showed that the amine-modified mesoporous materials would be a promising sorbent in the future CO2 capture.
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