Li 8 SiO 6 and Li 4 SiO 4 were synthesized by a solid-state reaction. Then, dynamic and isothermal thermogravimetric water vapor sorption experiments were performed using two carrier gases: N 2 and CO 2 . Initially, the Li 8 SiO 6 −H 2 O−(N 2 or CO 2 ) systems were analyzed. It was evidenced that Li 8 SiO 6 can trap water physically and chemically, producing Li−OH superficial species. When CO 2 was used as the carrier gas, Li 8 SiO 6 continued chemisorbing H 2 O but CO 2 was trapped as well, forming Li 2 CO 3 and Li 4 SiO 4 as secondary phases. On the basis of these results, the Li 4 SiO 4 −H 2 O−CO 2 system was also analyzed. The experimental results and different theoretical thermodynamic calculations confirmed that Li 8 SiO 6 can chemisorb 2 moles of CO 2 per mole of ceramic at a low temperature range (30−80°C). Finally, different CO 2 chemisorption kinetic experiments were performed to analyze and quantify the trapped CO 2 .
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