A perfluorinated covalent triazine-based framework for highly selective and water-tolerant CO2 capture

作者：Zhao, Yunfeng^*; Yao, Ke Xin; Teng, Baiyang; Zhang, Tong; Han, Yu

来源：Energy & Environmental Science, 2013, 6(12): 3684-3692.

DOI：10.1039/c3ee42548g

• CARBON-DIOXIDE CAPTURE
• METAL-ORGANIC FRAMEWORKS
• POROUS POLYMER NETWORKS
• CATALYZED SYNTHESIS
• AROMATIC FRAMEWORK
• MOLECULAR-SIEVES
• EFFICIENT CO2
• GAS-STORAGE
• ADSORPTION
• SEPARATION

We designed and synthesized a perfluorinated covalent triazine-based framework (FCTF-1) for selective CO2 capture. The incorporation of fluorine (F) groups played multiple roles in improving the framework's CO2 adsorption and separation capabilities. Thermodynamically, the strongly polar C-F bonds promoted CO2 adsorption via electrostatic interactions, especially at low pressures. FCTF-1's CO2 uptake was 1.76 mmol g(-1) at 273 K and 0.1 bar through equilibrium adsorption, exceeding the CO(2)w adsorption capacity of any reported porous organic polymers to date. In addition, incorporating F groups produced a significant amount of ultra-micropores (<0.5 nm), which offered not only high gas adsorption potential but also kinetic selectivity for CO2-N-2 separation. In mixed-gas breakthrough experiments, FCTF-1 exhibited an exceptional CO2-N-2 selectivity of 77 under kinetic flow conditions, much higher than the selectivity (31) predicted from single-gas equilibrium adsorption data. Moreover, FCTF-1 proved to be tolerant to water and its CO2 capture performance remained excellent when there was moisture in the gas mixture, due to the hydrophobic nature of the C-F bonds. In addition, the moderate adsorbate-adsorbent interaction allowed it to be fully regenerated by pressure swing adsorption processes. These attributes make FCTF-1 a promising sorbent for CO2 capture from flue gas.

• 出版日期2013-12
• 单位苏州大学