Influence of steam on Li4SiO4 based carbon capture

“steam also exists in realistic CO2 absorption conditions, and the content of steam during the typical sorption-enhance hydrogen production process is more than 30%. Ochoa-Fernández et al. [79] reported that steam could promote the mobility of alkaline ions, indicating that the limiting resistance of the CO2 absorption reaction could be reduced. Thus, the presence of steam in the absorption atmosphere also has non-negligible effect on the CO2 absorption capacity of Li4SiO4 material.

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.”

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