Enhanced carbon dioxide adsorption performance and kinetic study of K and Al co-doped Li4SiO4

Herein, we report the effects of doped K and Al on the carbon dioxide (CO₂) adsorption performance of the Li₄SiO₄-based adsorbents. The CO₂ adsorption capacity of 0.8 wt% K and 1.5 wt% Al doped Li₄SiO₄ is ～2.2 times and ～1.3 times higher than that of the pristine Li₄SiO₄ at 500 and 600 °C, respectively. The kinetic study further indicated that the reaction rates of the lithium diffusion process is greatly improved by K and Al doping, and the lithium diffusion rate of 0.8 wt% K and 1.5 wt% Al doped Li₄SiO₄ is ～2 times higher than that of the pristine Li₄SiO₄ at 575–650 °C. K and Al doping increases the adsorption capacity of Li₄SiO₄-based adsorbents, and widens its effective adsorption temperature range