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Unprecedented high-temperature CO2 selectivity in N2-phobic nanoporous covalent organic polymers

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  • Hasmukh A. Patel

    (Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST))

  • Sang Hyun Je

    (Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST))

  • Joonho Park

    (Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST))

  • Dennis P. Chen

    (Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST))

  • Yousung Jung

    (Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST))

  • Cafer T. Yavuz

    (Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST))

  • Ali Coskun

    (Graduate School of Energy, Environment, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST)
    Korea Advanced Institute of Science and Technology (KAIST))

Abstract

Post-combustion CO2 capture and air separation are integral parts of the energy industry, although the available technologies remain inefficient, resulting in costly energy penalties. Here we report azo-bridged, nitrogen-rich, aromatic, water stable, nanoporous covalent organic polymers, which can be synthesized by catalyst-free direct coupling of aromatic nitro and amine moieties under basic conditions. Unlike other porous materials, azo-covalent organic polymers exhibit an unprecedented increase in CO2/N2 selectivity with increasing temperature, reaching the highest value (288 at 323 K) reported to date. Here we observe that azo groups reject N2, thus making the framework N2-phobic. Monte Carlo simulations suggest that the origin of the N2 phobicity of the azo-group is the entropic loss of N2 gas molecules upon binding, although the adsorption is enthalpically favourable. Any gas separations that require the efficient exclusion of N2 gas would do well to employ azo units in the sorbent chemistry.

Suggested Citation

  • Hasmukh A. Patel & Sang Hyun Je & Joonho Park & Dennis P. Chen & Yousung Jung & Cafer T. Yavuz & Ali Coskun, 2013. "Unprecedented high-temperature CO2 selectivity in N2-phobic nanoporous covalent organic polymers," Nature Communications, Nature, vol. 4(1), pages 1-8, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2359
    DOI: 10.1038/ncomms2359
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    Cited by:

    1. Li, Xiaoqiang & Ding, Yudong & Guo, Liheng & Liao, Qiang & Zhu, Xun & Wang, Hong, 2019. "Non-aqueous energy-efficient absorbents for CO2 capture based on porous silica nanospheres impregnated with amine," Energy, Elsevier, vol. 171(C), pages 109-119.
    2. Yuan, Xiangzhou & Wang, Junyao & Deng, Shuai & Suvarna, Manu & Wang, Xiaonan & Zhang, Wei & Hamilton, Sara Triana & Alahmed, Ammar & Jamal, Aqil & Park, Ah-Hyung Alissa & Bi, Xiaotao & Ok, Yong Sik, 2022. "Recent advancements in sustainable upcycling of solid waste into porous carbons for carbon dioxide capture," Renewable and Sustainable Energy Reviews, Elsevier, vol. 162(C).
    3. Patel, Himanshu & Mohanty, Amar & Misra, Manjusri, 2024. "Post-combustion CO2 capture using biomass based activated porous carbon: Latest advances in synthesis protocol and economics," Renewable and Sustainable Energy Reviews, Elsevier, vol. 199(C).
    4. Qiao, Yuanting & Bailey, Josh J. & Huang, Qi & Ke, Xuebin & Wu, Chunfei, 2022. "Potential photo-switching sorbents for CO2 capture – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 158(C).

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