Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 285, Issue -, Pages 70-79Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2019.04.021
Keywords
Covalent organic framework; Porous material; Carbon dioxide uptake; High pressure; Crystalline material
Categories
Funding
- National Natural Science Foundation of China [21371109, 51803074]
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Three 2D N-rich COFs linked by -C=N- bond, named COF-SDU1, COF-SDU2, COF-SDU3, have been synthesized via the Schiff-base condensation reaction. Tri-(4-formacylphenoxy)-1,3,5-triazine (TRIF) is employed as N-rich aldehyde building block, and p-phenylenediamine (PA), hydrazine hydrate, and terephthalic dihydrazide (TPDH) are as the amine building blocks, respectively, which results in high crystallinity, high BET surface area, and abundant N-atom sites for COF-SDU1, COF-SDU2, and COF-SDU3. COF-SDU1 exhibits large CO2 uptake of 741 mg g(-1) at 298 K under 45 bar, while COF-SDU2 is 484 mg g(-1) and COF-SDU3 is only 331 mg g(-1), which are closely related to their specific surface area but irrespective of the absolute N-content. The result clearly reveals the impact of various factors, including N-content, BET surface area and pore size on CO2 storage performance. It shows that N-content determines capacities at low pressure (< 1 bar), BET surface area plays the decisive role under relative low pressure (< 25 bar) and large pore size helps enhance the capacity under relative high pressure (> 25 bar). Among all factors, BET surface area plays the crucial role in determining the high-pressure CO2 storage capacity, which is well verified by theoretical modeling.
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