Cyclic carbon dioxide CO2 adsorption-desorption experiments were conducted at ~295 K and a maximum pressure of 10 bar using laboratory-synthesized activated carbon pellets derived from almond shells. Over 20 cycles, the CO2 adsorption equilibrium on these CA-Am-Pas pellets demonstrated stability from the 9th cycle onward, with adsorption efficiencies ranging from 1 to 0.8 and desorption yields around 40%. Equilibrium modelling across all cycles consistently showed the Freundlich isotherm as the best fit, achieving regression coefficients very close to 1.
Yahia et al. (2026) studied this question.