Potassium-Based Solid Sorbents for CO<sub>2</sub> Adsorption: Key Role of Interconnected Pores
Industrial CO<sub>2</sub> emissions contribute to pollution and greenhouse effects, highlighting the importance of carbon capture. Potassium carbonate (K<sub>2</sub>CO<sub>3</sub>) is an effective CO<sub>2</sub> absorbent, yet its liquid-phase absorpti...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/14/22/1838 |
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| Summary: | Industrial CO<sub>2</sub> emissions contribute to pollution and greenhouse effects, highlighting the importance of carbon capture. Potassium carbonate (K<sub>2</sub>CO<sub>3</sub>) is an effective CO<sub>2</sub> absorbent, yet its liquid-phase absorption faces issues like diffusion resistance and corrosion risks. In this work, the solid adsorbents were developed with K<sub>2</sub>CO<sub>3</sub> immobilized on the selected porous supports. Al<sub>2</sub>O<sub>3</sub> had an optimum CO<sub>2</sub> adsorption capacity of 0.82 mmol g<sup>−1</sup>. After further optimization of its pore structure, the self-prepared support Al<sub>2</sub>O<sub>3</sub>-2, which has an average pore diameter of 11.89 nm and a pore volume of 0.59 cm<sup>3</sup> g<sup>−1</sup>, achieved a maximum CO<sub>2</sub> adsorption capacity of 1.12 mmol g<sup>−1</sup> following K<sub>2</sub>CO<sub>3</sub> impregnation. Additionally, the relationship between support structure and CO<sub>2</sub> 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<sub>2</sub> adsorption performance. During 10 cycles of testing, the K<sub>2</sub>CO<sub>3</sub>-based adsorbents demonstrated consistent high CO<sub>2</sub> adsorption capacity with negligible degradation. |
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| ISSN: | 2079-4991 |