Influence of steam on Li4SiO4 based carbon capture

Ochoa-Fernández et al. [80] reported that the presence of 10 vol.% steam in the absorption atmosphere could raise the CO₂ capacity from 9.5 to 29 wt.%. Additionally, they also found that the presence of steam accelerated the regeneration reaction: the regeneration process became faster and more thorough with the presence of steam, and cyclic CO₂ absorption performance of Li₄SiO₄ material degraded slightly after eight cycles with the presence of steam, almost the same as the experimental data obtained in dry atmosphere. Quinn et al. [81] used pelletized Li₄SiO₄ materials for CO₂ absorption in 14.7% CO₂, 2.6% steam in N₂ at 550 °C, and they found that the CO₂ absorption capacity after 10 min was almost three times higher than that in dry atmosphere. Furthermore, Sanna et al. [63] synthesized Li₄SiO₄ material from FA as SiO₂ precursor, and the CO₂ absorption capacity was enhanced by steam. Puccini et al. [82] also noted that the CO₂ absorption rate was accelerated correspondingly with increasing steam concentration from 10 to 30 vol.%.

As mentioned above, the presence of steam contributes to the CO₂ absorption by Li₄SiO₄ material, because the addition of steam maybe enhances the mobility of Li⁺ and O²⁻ [27,83], thus the resistance of diffusion is reduced, so the CO₂ absorption capacity of Li₄SiO₄ is enhanced by steam.”