三元アルカリ硝酸塩で促進したMgO吸着材の吸着速度向上：低CO2濃度流からの燃焼後CO2回収のための吸着材活性化
Enhancing sorption kinetics of the ternary alkali nitrate salts‐promoted MgO sorbents via sorbent activation for post‐combustion carbon capture from low CO 2 concentration stream (原題)
Kian Hoong Chai, Loong Kong Leong, Thomas Chung-Kuang Yang, Sumathi Sethupathi, Kok Chung Chong, Timm Joyce Tiong, Yeow Hong Yap
🤖 gxceed AI 要約
日本語
本研究は、MgO系CO2吸着材の実用化を妨げる遅い吸着速度と誘導期間の問題に対し、温和な活性化処理を提案した。15% CO2を含む模擬排ガスを用いた実験で、活性化によりピーク吸着速度が約2倍に向上し、CO2吸着量が7.58から9.46 mmol/gに増加した。さらに、低いWHSV条件下で81.9%のCO2除去効率を達成し、10サイクルにわたり安定した性能を示した。この成果は、低濃度CO2源からのCCUS技術の効率向上に寄与する。
English
This study proposes a mild activation strategy to improve the slow sorption kinetics of MgO-based CO2 sorbents for post-combustion capture from low-CO2 flue gas. Activation at 240°C for 0.5 h doubled the peak sorption rate and increased CO2 uptake from 7.58 to 9.46 mmol/g. With sufficient gas-solid contact time, the activated sorbent achieved 81.9% CO2 removal efficiency and maintained 81.35% over 10 cycles. The findings enhance the feasibility of MgO sorbents for industrial carbon capture.
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
日本のカーボンリサイクル戦略やCCUS推進政策に資する技術であり、低濃度CO2排出源（工場排ガス等）への適用が期待される。SSBJ開示における排出削減対策の具体化にも関連する。
In the global GX context
This work advances post-combustion carbon capture technology, relevant to global CCUS deployment and climate disclosure frameworks like TCFD/ISSB that require credible decarbonization pathways. Improved sorbent performance for low-CO2 streams supports industrial-scale capture projects, aligning with transition finance criteria.
👥 読者別の含意
🔬研究者:Provides a novel activation method for MgO sorbents, offering insights into improving sorption kinetics for low-CO2 capture.
🏢実務担当者:Offers a potential cost-effective sorbent activation technique for CCUS applications, relevant for industrial CO2 capture projects.
🏛政策担当者:Highlights technological advancements in CCUS that could inform policy support for carbon capture deployment.
📄 Abstract（原文）
Abstract BACKGROUND MgO‐based sorbents offer high theoretical CO 2 capacity but are constrained in practical applications by sluggish sorption kinetics, prolonged induction periods, and poor performance under the low CO 2 concentration typical of flue gas. This study proposes a mild activation strategy to reduce the nucleation barrier for MgCO 3 formation and investigates its effectiveness together with reactor operating conditions using a simulated flue gas stream containing 15% CO 2 . RESULTS The fresh 9 mol% (Li 0.18 Na 0.52 K 0.30 )NO 3 ‐MgO sorbent exhibited slow carbonation kinetics, requiring 74.2 min to reach its peak sorption rate of 0.0423 mmol/g·min and achieving 7.58 mmol/g at 280 °C after 4 h. Activation at 240 °C for 0.5 h shortened the time to peak sorption to 8.1 min, increased the peak sorption rate to 0.0784 mmol/g·min, thereby enhancing the CO 2 uptake to 9.46 mmol/g. Effective regeneration required temperatures above 320 °C, with non‐isothermal operation achieving >90% desorption efficiency at 340 °C. Although activation substantially improved intrinsic sorption kinetics, high CO 2 removal efficiency was only achieved when sufficient gas–solid contact time was provided. At a weight hourly space velocity (WHSV) of 1.7 mL/g·min after sorption at 280 °C for 4 h, the activated sorbent achieved 81.9% CO 2 removal efficiency. The activated sorbent maintained an average CO 2 removal efficiency of 81.35% over 10 cycles, with each sorption cycle lasting for 1.5 h at 280 °C. CONCLUSION Activation improves the intrinsic sorption kinetics, while lowering the WHSV translates these kinetic improvements into high CO 2 removal efficiency. © 2026 Society of Chemical Industry (SCI).
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1002/jctb.70258first seen 2026-08-27 05:02:35
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