CO2 capture by Li4SiO4 Sorbents: From fundamentals to applications

Carbon capture, utilization and storage (CCUS) is widely acknowledged as an essential route to mitigate CO2 emissions into atmosphere. Li4SiO4 as a sort of high-temperature CO2 sorbent has great potentials in CCUS applications, as well as being integrated with other high value-added processes like the integrated CO2 capture and utilization (ICCU). This review critically discusses the state-of-the-art researches on the CO2 capture by Li4SiO4 from the fundamental aspects of thermodynamic equilibrium, reaction mechanisms and kinetics, sorbent modifications, to potential applications. Difference between theoretical and practical CO2 adsorption/desorption equilibrium is emphasized, product layer distribution features and adsorption/desorption mechanisms are discussed, typical kinetic models and their applications in CO2 adsorption and desorption by Li4SiO4 are analyzed, and recent advances in high-efficient Li4SiO4-based sorbents are summarized. We hope this review can stimulate future studies on understanding the basic features and mechanism of CO2 capture process, developing low-cost and scalable sorbent manufacturing method, and establishing more integrated and effective systems for the high-value disposal of CO2.