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水和活性化ドロマイトを用いた中温CO2回収とin situ逆水性ガスシフト反応の統合

Hydration-Activated Dolomite as a Medium-Temperature Sorbent for Integrated CO2 Capture and In Situ Reverse Water-Gas Shift (原題)

Dhital S, Tuladhar N

Research Squareプレプリント2026-08-26#CCUS経営インパクト: コスト削減対象セクター: manufacturing
DOI: 10.21203/rs.3.rs-10623444/v1
原典: https://doi.org/10.21203/rs.3.rs-10623444/v1

🤖 gxceed AI 要約

日本語

本研究は、天然ドロマイトの液相水和処理により、中温（400℃）でのCO2回収能を大幅に向上させたICCU-RWGS用ソルベントを開発。水和によりCaO-Ca(OH)2相転移が誘起され、細孔構造が再構築され、CO2回収量は未処理の4.2倍に達した。5サイクル後も安定した性能を示し、産業排ガスへの応用可能性を示した。

English

This study develops a hydration-activated dolomite sorbent for integrated CO2 capture and reverse water-gas shift (ICCU-RWGS) at medium temperatures (400°C). Hydration induces CaO-Ca(OH)2 phase transformation and pore reconstruction, achieving 4.2 times higher CO2 capture than unmodified dolomite. The sorbent maintains stable performance over five cycles, offering a cost-effective solution for industrial flue gas decarbonization.

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

日本の鉄鋼・セメント産業はCO2排出削減が急務であり、中温排ガスでのCO2回収技術は既存設備への導入が期待される。本研究は天然鉱物を用いた低コストなソルベント改良であり、国内のCCUS研究開発やカーボンフットプリント削減に寄与する可能性がある。

In the global GX context

This work addresses a critical gap in ICCU-RWGS technology by enabling CO2 capture at medium temperatures typical of industrial flue gas (coal, steel, cement). The simple hydration method enhances sorbent performance, offering a scalable and cost-effective solution for global decarbonization efforts, particularly in hard-to-abate sectors.

👥 読者別の含意

🔬研究者:Provides a novel method to extend the operational temperature range of CaO-based sorbents, with mechanistic insights into phase transformation and pore engineering.

🏢実務担当者:Offers a low-cost sorbent modification technique that could be integrated into existing carbon capture systems for medium-temperature flue gas streams.

🏛政策担当者:Highlights the potential of natural mineral-based sorbents for industrial decarbonization, supporting policies that promote CCUS technology deployment.

📄 Abstract（原文）

<title>Abstract</title> <p> Integrated carbon capture and utilization via reverse water gas shift reaction (ICCU-RWGS) using CaO based sorbent is promising decarbonization route, however its deployment is constrained by a thermal mismatch: conventional CaO based sorbent performs optimally at 600–700 ℃, whereas flue gas (coal, steel, cement plants) typically falls within 200–500 ℃. To address this technical difficulty, this work presents liquid phase hydration of natural dolomite—a simple and inexpensive processing method—could induce CaO-Ca(OH) <sub>2</sub> phase transformation that exhibit excellent CO <sub>2</sub> capture at mid carbonation temperature of 400 ℃. Thermodynamic equilibrium analysis confirms that Ca(OH) <sub>2</sub> formation and CO <sub>2</sub> carbonation remain spontaneous below 515 ℃, establishing the mechanistic basis for the observed medium-temperature enhancement. Systematic investigation of hydration duration and temperature found 30 min-50 ℃ as optimum hydration parameter, yielding CO <sub>2</sub> capture, CO yield and CO <sub>2</sub> yield as 4.86 mmol g <sup>− 1</sup> ,2.59 mmol g <sup>− 1</sup> , and 1.19 mmol g <sup>− 1</sup> which is 4.2 times higher CO <sub>2</sub> capture capacity than unmodified dolomite under identical medium temperature testing conditions. Comprehensive characteristics through XRD, BET/BJH and SEM showed hydration induces molar-volume-driven pore reconstruction, increases accessible surface area, and generates a more open morphology that improves gas diffusion and structural tolerance while XRD confirms CaO/Ca(OH) <sub>2</sub> /CaCO <sub>3</sub> phase transformation pathway, while MgO remained structurally stable during cycling. Cyclic testing with intermediate re-hydration demonstrates that the modified sorbent maintains a CO <sub>2</sub> capture capacity of 3.0 mmol g <sup>− 1</sup> and CO yield of 1.5 mmol g <sup>− 1</sup> over five cycles, substantially outperforming both continuously operated and unhydrated calcined dolomite. These findings establish hydration as an effective strategy for extending the operational temperature range of natural CaO based ICCU-RWGS sorbents. </p>

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