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

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

🔬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.

抄録 地質学的CO2貯留中の水素生成は、貯留層の完全性とエネルギー回収の両方に影響を及ぼすが、貯留層関連条件下では十分に制約されていない。本研究では、鉄に富む砂岩におけるCO2–塩水–岩石相互作用を高温（75 °C）で調査し、in-situでの水素生成の可能性を評価する。加圧反応器で実施したバッチ実験では、CO2曝露後に顕著な塩水の酸性化（pHが約7.7から約5.4へ低下）、全無機炭素（TIC）の増加、および溶存鉄の有意な溶出が観察された。ガスクロマトグラフィー分析により、気相中の水素濃度が約0.22 wt.%であることが検出され、CO2–塩水–岩石相互作用中に水素生成が発生したことが確認された。鉱物学分析では、バルク鉱物組成に検出可能な変化は見られず、反応が広範な鉱物変成を伴うものではなく、主に表面支配的であることが示唆された。これらの結果は、鉄含有砂岩におけるCO2誘発性の地球化学的反応が、貯留層関連条件下で水素生成を促進し得るという実験的証拠を提供し、地下CO2貯留システムの地球化学的進化と潜在的なエネルギー的影響を評価する際に、そのようなプロセスを考慮する必要性を強調するものである。

AI 翻訳（deepseek-v4-flash）。 正確を期す場合は下の原文を参照してください。

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.

• openalex https://doi.org/10.2118/232636-msfirst seen 2026-05-19 04:59:56 · last seen 2026-06-17 07:12:21