Li 4 SiO4 has been regarded as one of the most promising high-temperature CO2 sorbents. However, for practical applications, its CO2 sorption kinetics, cycling stability and sorption properties at lower temper-atures or lower CO2 concentrations have to be improved. In this contribution, four Li 4 SiO4 sorbents were synthesized from zeolite precursors MCM-41, MCM-48, TS-1, and ZSM-5. The CO2 uptake, cycling stability and the optimal CO2 sorption conditions were investigated. Among the samples, MCM-41-Li 4 SiO4 showed the best cycling stability at 650 ℃, with a stable reversible CO2 uptake of 29.1 wt% under 100 vol% CO2 during 20 cycles. But its sorption kinetics and CO2 uptakes at lower temperatures and lower CO2 con-centrations need to be improved. We then demonstrated that the sorption kinetics can be improved by modifying the MCM-41 precursor with metals such as Al, Ti, Ca, and Na. The Na-MCM-41-Li 4 SiO4 sample exhibited the highest sorption rate, and reached the equilibrium sorption capacity close to the theo-retical value of 36.7 wt% within 20 min. In addition, we proved that coating the MCM-41-Li 4 SiO4 with Na 2 CO3 and K 2 CO3 can significantly increase the CO2 uptakes at lower temperatures (e.g. 550 ℃) and lower CO2 concentrations (10–20 vol%). At 550 ℃ and under 20 vol% CO2 , 15 wt% K 2 CO3 -MCM-41-Li 4 SiO4 and 10 wt% Na 2 CO3 -MCM-41-Li 4 SiO4 sorbents resulted in a CO2 uptake of 32.2 wt% and 34.7 wt%, respec-tively, which are much higher than that of MCM-41-Li 4 SiO4 (11.8 wt%). These two sorbents also showed good cycling stability. The promoiting mechasnim by alkali carbonate coating was discussed by a double-shell model.