Influence of temperature and kinetics of CO2 capture using spherical amine grafted silica aerogels

https://doi.org/10.1039/D0RA04497K

“As shown in Fig. 8, the CO₂ adsorption kinetics of the SASA-3 change with different temperatures. On account of the thermodynamic theory, the CO₂ adsorption capacity of the amine-based adsorbents should decrease with the temperature.⁵⁸ However, the CO₂ adsorption capacity of the SASA-3 increases from 25 to 35 °C, then decreases with the temperature below 55 °C. The reason is that the mass transfer and reaction activity are limited under low temperature.^33,40,59 When the temperature was above 35 °C, the thermodynamics would become predominant again. Fig. 9 shows the cyclic adsorption capacities of SASA-3 at 35 °C. The SASA-3 shows excellent stability with 10 cycles. It indicates that amine groups in the SASA are immobilized to the aerogel via forming the chemical bonds.”

“Fig. 8 CO₂ adsorption kinetics of the SASA-3 under different temperatures with dry 1% CO₂.”

“Fig. 9 Cyclic CO₂ adsorption kinetics of the SASA-3 with dry 1% CO₂ at 35 °C.”