Directly synthesized high-silica CHA zeolite for efficient CO2/N2 separation.
In: Journal of Environmental Chemical Engineering, Jg. 12 (2024-08-01), Heft 4, S. N.PAG
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Zugriff:
Carbon dioxide capture is an effective method to mitigate climate change. Highly CO 2 -selective and highly moisture-resistant absorbent is essential for energy-efficient carbon capture by absorption. Herein, a highly CO 2 -selective and high-silica CHA zeolite in a pure lithium form (Li-SSZ-13) was synthesized using a direct synthesis method for the first time. The effects of gel n (SiO 2)/ n (Al 2 O 3) ratio, gel n (SiO 2)/ n (Li 2 O) ratio and synthesis time on the crystallinity, yield, micropore volume and CO 2 loading of the crystals were systematically investigated. The adsorption isotherms of CO 2 and N 2 were measured for directly synthesized Li-SSZ-13, conventional Na-SSZ-13 and ion-exchanged Li-Na-SSZ-13 zeolites. The dynamic breakthrough adsorption properties were measured for Li-SSZ-13 in comparison with Na-SSZ-13 and Li-Na-SSZ-13. The obtained Li-SSZ-13 exhibited a high CO 2 adsorption capacity of 4.48 mmol/g and a high CO 2 /N 2 IAST selectivity of 310 at 100 kPa and 273 K, which were 45.0 % and 441 % higher than Na-SSZ-13 zeolite, 24.8 % and 179 % higher than Li-Na-SSZ-13 zeolite, respectively. It suggests that directly synthesized Li-SSZ-13 zeolite has great potential for efficient CO 2 capture from flue gas. [Display omitted] • Pure lithium form Li-SSZ-13 was prepared by direct synthesis route for the first time. • Li-SSZ-13 zeolite displayed higher CO 2 adsorption capacity and CO 2 /N 2 selectivity than Na-SSZ-13 and Li-exchanged ones. • A high CO 2 /N 2 IAST selectivity of 310 was achieved. • Breakthrough experiments demonstrated that Li-SSZ-13 is a potentially good CO 2 adsorbent. [ABSTRACT FROM AUTHOR]
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Titel: |
Directly synthesized high-silica CHA zeolite for efficient CO2/N2 separation.
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Autor/in / Beteiligte Person: | Wang, Wenhan ; Li, Wenqiang ; Wang, Zijian ; Liu, Bo ; Wang, Bing ; Duan, Jingui ; Zhou, Rongfei |
Zeitschrift: | Journal of Environmental Chemical Engineering, Jg. 12 (2024-08-01), Heft 4, S. N.PAG |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 2213-3437 (print) |
DOI: | 10.1016/j.jece.2024.113036 |
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