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Linear driving force (LDF) model K2CO3 carbonation — Pending

https://doi.org/10.1016/j.ccst.2021.100011

Linear driving force (LDF) model had been employed to evaluate the physical adsorption kinetics of CO2 over K2CO3/AC (Eq. 13). Physical and chemical adsorption coexisted in the CO2 capture process of K2CO3/AC. Water vapor presented in the N2-CO2-H2O ternary mixtures promoted CO2 chemisorption of K2CO3/AC, while its CO2 physical adsorption rate would be weakened. Upon loading K2CO3 on AC, mass transfer resistance increased but the activation energy for CO2 physical adsorption decreased due to the improved surface basicity (Guo et al., 2015b). The physically adsorbed CO2 predicted by the LDF model was then deducted from the CO2 sorption capacity of K2CO3/AC, leaving the chemisorbed CO2 contributed from carbonation well estimated by the SCM. In this way, the effects of K2CO3 loading and operating parameters on carbonation kinetics of K2CO3/AC were well described by SCM (Guo et al., 2015e).”

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“where qt and qe are the time-dependent CO2 uptake and the equilibrium CO2 adsorption capacity, and kLDF is the lumped mass transfer coefficient.”

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