Microstructural and CO₂ chemisorption analyses of Li ₄SiO₄: Effect of surface modification by the ball milling process

The ball milling process was used to modify microstructurally the Li ₄SiO₄, and different structural and microstructural analyses were performed, followed by an analysis of the CO₂ chemisorption process. In comparison to previous reports, the Li4SiO4 modified sample exhibited very important differences and improvements during the dynamic CO₂ chemisorption process. Additionally, an analysis of the Li ₄SiO₄.CO₂ chemisorption products showed that the Li₂CO₃.Li₂SiO₃ external shell exhibits a degree of mesoporosity at T < 500 °C, which is favorable for diffusion processes. Finally, the CO₂ chemisorption.desorption process was analyzed at 550 °C during 10 cycles. The ball milled Li ₄SiO₄ sample showed a stable performance during the CO₂ chemisorption.desorption test and presented better efficiencies than the solid-state sample. The mechanical milling technique proved to be an effective method for modifying the microstructural properties of the ceramic absorbent by enhancing the CO₂ chemisorption.desorption process without further sintering effects.