Efficient $ CO_{2} $ adsorption and mechanism on nitrogen-doped porous carbons
Abstract In this work, nitrogen-doped porous carbons (NACs) were fabricated as an adsorbent by urea modification and KOH activation. The $ CO_{2} $ adsorption mechanism for the NACs was then explored. The NACs are found to present a large specific surface area (1920.72–3078.99 $ m^{2} $·$ g^{−1} $) and high micropore percentage (61.60%–76.23%). Under a pressure of 1 bar, sample NAC-650-650 shows the highest $ CO_{2} $ adsorption capacity up to 5.96 and 3.92 mmol·$ g^{−1} $ at 0 and 25 °C, respectively. In addition, the $ CO_{2} $/$ N_{2} $ selectivity of NAC-650-650 is 79.93, much higher than the value of 49.77 obtained for the nonnitrogen-doped carbon AC-650-650. The $ CO_{2} $ adsorption capacity of the NAC-650-650 sample maintains over 97% after ten cycles. Analysis of the results show that the $ CO_{2} $ capacity of the NACs has a linear correlation (R2 = 0.9633) with the cumulative pore volume for a pore size less than 1.02 nm. The presence of nitrogen and oxygen enhances the $ CO_{2} $/$ N_{2} $ selectivity, and pyrrole-N and hydroxy groups contribute more to the $ CO_{2} $ adsorption. In situ Fourier transform infrared spectra analysis indicates that $ CO_{2} $ is adsorbed onto the NACs as a gas. Furthermore, the physical adsorption mechanism is confirmed by adsorption kinetic models and the isosteric heat, and it is found to be controlled by $ CO_{2} $ diffusion. The $ CO_{2} $ adsorption kinetics for NACs at room temperature and in pure $ CO_{2} $ is in accordance with the pseudo-first-order model and Avramís fractional-order kinetic model..
| Medienart: |
Artikel |
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| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:15 |
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| Enthalten in: |
Frontiers of chemical science and engineering - 15(2020), 3 vom: 21. Sept., Seite 493-504 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Wang, Yanxia [VerfasserIn] |
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| Links: |
Volltext [lizenzpflichtig] |
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| BKL: |
58.00 / Chemische Technik: Allgemeines / Chemische Technik: Allgemeines |
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| Themen: |
Adsorption |
| Anmerkungen: |
© Higher Education Press 2020 |
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| doi: |
10.1007/s11705-020-1967-0 |
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| Förderinstitution / Projekttitel: |
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OLC2125526603 |
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| 520 | |a Abstract In this work, nitrogen-doped porous carbons (NACs) were fabricated as an adsorbent by urea modification and KOH activation. The $ CO_{2} $ adsorption mechanism for the NACs was then explored. The NACs are found to present a large specific surface area (1920.72–3078.99 $ m^{2} $·$ g^{−1} $) and high micropore percentage (61.60%–76.23%). Under a pressure of 1 bar, sample NAC-650-650 shows the highest $ CO_{2} $ adsorption capacity up to 5.96 and 3.92 mmol·$ g^{−1} $ at 0 and 25 °C, respectively. In addition, the $ CO_{2} $/$ N_{2} $ selectivity of NAC-650-650 is 79.93, much higher than the value of 49.77 obtained for the nonnitrogen-doped carbon AC-650-650. The $ CO_{2} $ adsorption capacity of the NAC-650-650 sample maintains over 97% after ten cycles. Analysis of the results show that the $ CO_{2} $ capacity of the NACs has a linear correlation (R2 = 0.9633) with the cumulative pore volume for a pore size less than 1.02 nm. The presence of nitrogen and oxygen enhances the $ CO_{2} $/$ N_{2} $ selectivity, and pyrrole-N and hydroxy groups contribute more to the $ CO_{2} $ adsorption. In situ Fourier transform infrared spectra analysis indicates that $ CO_{2} $ is adsorbed onto the NACs as a gas. Furthermore, the physical adsorption mechanism is confirmed by adsorption kinetic models and the isosteric heat, and it is found to be controlled by $ CO_{2} $ diffusion. The $ CO_{2} $ adsorption kinetics for NACs at room temperature and in pure $ CO_{2} $ is in accordance with the pseudo-first-order model and Avramís fractional-order kinetic model. | ||
| 650 | 4 | |a porous carbon | |
| 650 | 4 | |a CO | |
| 650 | 4 | |a adsorption | |
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| 650 | 4 | |a adsorption mechanism | |
| 650 | 4 | |a kinetics | |
| 700 | 1 | |a Hu, Xiude |4 aut | |
| 700 | 1 | |a Guo, Tuo |4 aut | |
| 700 | 1 | |a Hao, Jian |4 aut | |
| 700 | 1 | |a Si, Chongdian |4 aut | |
| 700 | 1 | |a Guo, Qingjie |4 aut | |
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