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Covalent Organic Frameworks with Deep Eutectic Linkages for Low-Concentration Carbon Capture

低濃度二酸化炭素回収のための深共晶結合を有する共有結合性有機構造体 (AI 翻訳)

Hui Li, Xiansong Shi, Weiwei Li, Wei Zhao, Yogesh V. Joshi, Saifudin Abubakar, Dan Zhao

Journal of the American Chemical Society📚 査読済 / ジャーナル2026-05-22#CCUSOrigin: Global
DOI: 10.1021/jacs.6c03472
原典: https://doi.org/10.1021/jacs.6c03472

🤖 gxceed AI 要約

日本語

本研究は、深共晶結合（DEL）を有する共有結合性有機構造体（COF）を開発し、低濃度CO2回収における高性能を実証した。Im-TBDは60°Cの低温度で再生可能で、20サイクルにわたり安定した性能を示し、アミン系吸着剤の劣化問題を克服。直接空気回収（DAC）条件下でCO2/N2選択性1711、天然ガス複合発電排ガス条件下で230を達成。再生熱要件は水系システム比72～96%削減された。

English

This study develops a covalent organic framework with deep eutectic linkages (Im-TBD) for low-concentration CO2 capture. It achieves high CO2/N2 selectivity (1711 under DAC, 230 under NGCC flue gas) and low regeneration temperature (60°C) with excellent oxidation resistance over 20 cycles. Regeneration heat requirement is reduced by 72-96% compared to water-based systems. This work lays the foundation for next-generation non-amine carbon capture adsorbents.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本は2050年カーボンニュートラル目標達成のためCCUS技術に注力しており、本材料は発電所や産業排ガスからのCO2回収コスト低減に貢献する可能性がある。アミン系吸着剤の劣化に代わる選択肢として、日本の火力発電所や水素製造施設での適用が期待される。

In the global GX context

This paper advances solid sorbent technology for direct air capture and point-source CO2 capture, addressing key challenges of amine degradation and high energy consumption. It offers a promising alternative for cost-effective carbon capture in global decarbonization efforts, aligning with ISSB and TCFD frameworks that emphasize climate resilience and technology innovation.

👥 読者別の含意

🔬研究者:Researchers in carbon capture materials will find a novel strategy for creating oxidation-resistant, low-temperature regenerable sorbents with exceptionally high selectivity.

🏢実務担当者:Corporate sustainability teams in power generation and heavy industry can monitor this technology as a potential future option for cost-effective CO2 capture.

🏛政策担当者:Policymakers supporting CCUS R&D could consider this material as a promising candidate for funding and scaling demonstration projects.

📄 Abstract（原文）

Adsorbents with low regeneration temperatures and high oxidation resistance are highly desirable for cost-effective carbon capture. While amine-based technologies demonstrate efficient CO2 capture capabilities at low concentrations, their inherent susceptibility to degradation under aerobic conditions significantly increases operational costs in carbon capture processes. Herein, we report the conversion of the imidazole linkage into a deep eutectic linkage (DEL) through embedding a strong superbase─1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD)─in imidazole-based covalent organic frameworks (COFs), capable of CO2 chelation at low concentrations with low regeneration temperature (60 °C) and high oxidation resistance. The successful conversion of the imidazole COF (Im-COF) to DEL COF (Im-TBD) is demonstrated through X-ray photoelectron spectroscopy (XPS), zeta potential tests, and 13C and 15N solid-state nuclear magnetic resonance (ssNMR) characterizations. Im-TBD exhibits a dramatic enhancement in CO2 affinity, achieving an exceptionally high CO2/N2 selectivity of 1711 under direct air capture conditions (DAC, 0.3 mmHg CO2) and 230 under carbon capture from the flue gas of natural gas combined-cycle power plants (NGCC, 30 mmHg CO2). More excitingly, Im-TBD can be readily regenerated at 60 °C under dry open air (VO2/VN2 = 21/79) and maintains stable performance over 20 consecutive cycles. Energy analysis based on sensible heat calculations further revealed a 72–96% reduction in the regeneration heat requirement for Im-TBD compared with the water-containing system. CO2 chelation mechanisms in Im-TBD are further proven through 13CO2-dosed ssNMR, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and thermodynamic calculations. Our strategy establishes a foundation for the development of next-generation nonamine adsorbents for carbon capture.

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