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A perfluorinated covalent triazine-based framework for highly selective and water-tolerant CO_2 capture

机译：全氟共价三嗪为基础的框架，用于高度选择性和耐水的CO_2捕集

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摘要

We designed and synthesized a perfluorinated covalent triazine-based framework (FCTF-1) for selective CO_2 capture. The incorporation of fluorine (F) groups played multiple roles in improving the framework's CO_2 adsorption and separation capabilities. Thermodynamically, the strongly polar C-F bonds promoted CO_2 adsorption via electrostatic interactions, especially at low pressures. FCTF-1 's CO_2 uptake was 1.76 mmol g~(-1) at 273 K and 0.1 bar through equilibrium adsorption, exceeding the CO_2 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 CO_2-N_2 separation. In mixed-gas breakthrough experiments, FCTF-1 exhibited an exceptional CO_2-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 CO_2 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 CO_2 capture from flue gas.
机译：我们设计和合成了一种用于选择性捕获CO_2的全氟化共价基于三嗪的骨架（FCTF-1）。氟（F）基团的引入在改善骨架的CO_2吸附和分离能力方面发挥了多种作用。在热力学上，强极性C-F键通过静电相互作用促进了CO_2的吸附，特别是在低压下。通过平衡吸附，在273 K和0.1 bar下，FCTF-1的CO_2吸收量为1.76 mmol g〜（-1），超过了迄今为止报道的任何多孔有机聚合物的CO_2吸附量。此外，掺入F基团会产生大量的超微孔（<0.5 nm），这不仅提供了高的气体吸附潜力，而且还为CO_2-N_2分离提供了动力学选择性。在混合气体突破实验中，FCTF-1在动流条件下显示出77的出色CO_2-N_2选择性，远高于单气体平衡吸附数据预测的选择性（31）。此外，由于C-F键具有疏水性，因此事实证明，FCTF-1能够耐受水，并且当混合气体中存在水分时，其对CO_2的捕集性能仍保持出色。此外，适度的被吸附物与吸附剂之间的相互作用使它可以通过变压吸附过程完全再生。这些特性使FCTF-1成为从烟气中捕获CO_2的有前途的吸附剂。

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  • 来源
    《Energy & environmental science》 |2013年第12期|3684-3692|共9页
  • 作者

    Yunfeng Zhao; Ke Xin Yao; Baiyang Teng; Tong Zhang; Yu Han;

  • 作者单位

    School of Energy, Soochow University, Suzhou, Jiangsu 215006, PR China,Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;

    Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;

    Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;

    Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;

    Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;

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