Cyclic absorption–desorption performances of carbon capture using Li4SiO4 nanoparticles

https://doi.org/10.1039/C6TA06133H

“Cyclic absorption–desorption performances for 15 cycles at 948 K using 100% CO₂ and 100% N₂ gases were recorded and the results are shown in Fig. 6a. As shown, the sample retained >95% (33.6 wt%) of its original absorption capacity even after 15 cycles at this very high temperature. Nevertheless, some structural and morphological changes are suspected as the shape of the absorption curve changed from a near perfect rectangle to smoothed edges as the number of cycles increased. Further improvement in the stability of the powders may be necessary and techniques like the addition of rare-earth second phases as reported by us recently may be required.³⁰ As shown here and in Fig. 5a, the sample showed an absorption capacity of ∼35% for absorption temperatures >823 K when the partial pressure of CO₂ gas was 1 atm (100% CO₂). Fig. 6b shows the comparative absorption curves of eutectic-3 at 873 K for the CO₂ partial pressure values of 1 atm (100% CO₂) and 0.15 atm (15% CO₂/85% N₂). It is clear that the sample is capable of absorbing CO₂ to >25 wt% within the first few minutes of absorption even at the reduced CO₂ partial pressure of 0.15 atm.”

“Fig. 6 (a) Cyclic absorption–desorption performance of eutectic-3 (absorption was carried out at 948 K and desorption at the same temperature by changing 100% CO₂ to 100% N₂ gas). (b) Comparison of the absorption curves of eutectic-3 with 100% CO₂ flow and with 15% CO₂ flow. Absorption was carried out at 873 K (15% CO₂ or 100% CO₂).”