Abstract
Industrial CO(2) emissions contribute to pollution and greenhouse effects, highlighting the importance of carbon capture. Potassium carbonate (K(2)CO(3)) is an effective CO(2) absorbent, yet its liquid-phase absorption faces issues like diffusion resistance and corrosion risks. In this work, the solid adsorbents were developed with K(2)CO(3) immobilized on the selected porous supports. Al(2)O(3) had an optimum CO(2) adsorption capacity of 0.82 mmol g(-1). After further optimization of its pore structure, the self-prepared support Al(2)O(3)-2, which has an average pore diameter of 11.89 nm and a pore volume of 0.59 cm(3) g(-1), achieved a maximum CO(2) adsorption capacity of 1.12 mmol g(-1) following K(2)CO(3) impregnation. Additionally, the relationship between support structure and CO(2) adsorption efficiency was also analyzed. The connectivity of the pores and the large pore diameter of the support may play a key role in enhancing CO(2) adsorption performance. During 10 cycles of testing, the K(2)CO(3)-based adsorbents demonstrated consistent high CO(2) adsorption capacity with negligible degradation.