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In-Situ Hydrogen Generation from Iron-Rich Sandstone During CO2 Injection: A Novel Pathway for Low-Carbon Hydrogen Production

CO2圧入時の鉄含有砂岩からのその場水素生成：低炭素水素製造の新たな経路 (AI 翻訳)

Ahmed Fatah, Abdullah Alqubalee, Ahmed Al-Yaseri

📚 査読済 / ジャーナル2026-05-18#水素
DOI: 10.2118/232636-ms
原典: https://doi.org/10.2118/232636-ms

🤖 gxceed AI 要約

日本語

本研究は、CO2地中貯留条件下での鉄含有砂岩とCO2-ブライン-岩石相互作用により、水素が生成されることを実験的に示した。75℃の加圧反応器実験で、CO2曝露後にpH低下、鉄溶出、気相中に約0.22wt%の水素を検出。鉱物組成の変化はなく、表面反応が主体と示唆。CCUSと水素製造の融合可能性を示す。

English

This experimental study demonstrates that CO2 injection into iron-rich sandstone at 75°C triggers geochemical reactions that generate hydrogen (0.22 wt% in gas phase). The findings suggest a novel pathway combining geological CO2 storage with low-carbon hydrogen production, highlighting the need to consider such processes in CCS projects.

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

日本ではCCS実証試験が進むが、水素生成の可能性を考慮した貯留層評価は未整備。本結果は、貯留層選定や長期挙動予測に新たな視点を提供する。

In the global GX context

Globally, CCUS projects focus on CO2 storage permanence, but this study reveals potential for coupled hydrogen generation, which could enhance project economics and energy recovery. Regulators and operators may need to reassess storage site characterization and monitoring protocols.

👥 読者別の含意

🔬研究者:Provides experimental evidence of hydrogen generation during CO2 storage, opening new avenues for integrated carbon-negative energy systems.

🏢実務担当者:May inform site selection for CCS projects with iron-rich formations, potentially adding hydrogen recovery as a value stream.

🏛政策担当者:Suggests that CCS regulations could incorporate hydrogen production pathways, requiring updated monitoring and reporting frameworks.

📄 Abstract（原文）

Abstract The generation of hydrogen during geological CO2 storage has implications for both storage integrity and energy recovery, yet remains poorly constrained under reservoir-relevant conditions. This study investigates CO2–brine–rock interactions in iron-rich sandstone at elevated temperature (75 °C) to evaluate the potential for in-situ hydrogen generation. Batch experiments conducted in pressurized reactors show pronounced brine acidification (pH decrease from ~7.7 to ~5.4), increased total inorganic carbon (TIC), and significant mobilization of dissolved iron following CO2 exposure. Gas chromatography analysis detected hydrogen in the gas phase at concentrations of approximately 0.22 wt.%, confirming that hydrogen generation occurred during CO2–brine–rock interaction. Mineralogical analysis showed no detectable change in bulk mineralogy, suggesting that the reactions are primarily surface-controlled rather than involving extensive mineral transformation. These results provide experimental evidence that CO2-induced geochemical reactions in iron-bearing sandstones can promote hydrogen generation under reservoir-relevant conditions and highlight the need to account for such processes when evaluating the geochemical evolution and potential energy implications of subsurface CO2 storage systems.

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