Screening of oxygen carriers for chemical looping CO2 conversion and hydrogen production based on Gibbs free energy
ギブス自由エネルギーに基づく化学ループCO2転換および水素製造用酸素キャリアのスクリーニング (AI 翻訳)
胡强, 王鹏
🤖 gxceed AI 要約
日本語
本研究は、化学ループ法によるCO2転換と水分解水素製造に用いる酸素キャリアを、ギブス自由エネルギー解析により熱力学的にスクリーニングした。Ellingham図を用いて各種金属の酸化反応と水との反応を評価し、Fe/Mn系は高温でのCO2還元に優れ、Mn/Cu/Ce系は低温での水素製造に有望であることを示した。反応の臨界温度を明らかにし、酸素キャリア選定の熱力学的基盤を提供する。
English
This study thermodynamically screens oxygen carriers for chemical looping CO2 conversion and hydrogen production via Gibbs free energy analysis. Using Ellingham diagrams, it evaluates metal oxidation and water reactions, revealing that Fe/Mn-based carriers excel at high-temperature CO2 reduction, while Mn/Cu/Ce-based carriers are promising for low-temperature hydrogen production. Critical reaction temperatures are clarified, providing a thermodynamic basis for carrier selection.
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
日本の水素社会実現やカーボンリサイクル政策（NEDOの技術開発など）に資する基盤研究。化学ループ技術はCO2有効利用と水素製造を同時に実現する可能性があり、国内の脱炭素技術ポートフォリオに貢献する。
In the global GX context
This study contributes to global efforts in CO2 utilization and clean hydrogen production, aligning with CCUS and hydrogen strategies under the Paris Agreement. It provides thermodynamic insights that can guide the development of efficient chemical looping processes, relevant for industrial decarbonization and energy transition.
👥 読者別の含意
🔬研究者:Provides thermodynamic screening criteria for oxygen carriers, useful for experimental design and process optimization in chemical looping.
🏢実務担当者:Offers guidance for selecting oxygen carriers in pilot or commercial chemical looping systems, potentially reducing costs and improving efficiency.
🏛政策担当者:Supports evidence for funding and policy support in CCUS and hydrogen technologies, highlighting promising pathways.
📄 Abstract（原文）
Chemical looping, with its advantages of efficient product separation and low energy consumption, has emerged as a crucial technical pathway for the CO2 conversion and hydrogen production via water splitting. Oxygen carriers, functioning within the chemical looping cycle, undertaking oxygen storage and transfer and participating in the redox reactions, serve as a key component that determines the reaction rates and product selectivity. To screen high-performance oxygen carriers, this study employed the Gibbs free energy analysis method to thermodynamically investigate the chemical looping reactions involving typical metals and corresponding oxides for the CO2 conversion and hydrogen production via water splitting. Based on the Ellingham diagrams, the feasibility of the conversion reactions and the performance of various metal-based oxygen carriers were evaluated. The Gibbs free energies for the oxidation of metals (such as iron, vanadium, manganese, cobalt, copper, and cerium) and that for the reactions between these metals and water were obtained. The feasibility and critical temperatures of the reactions of various metals and their oxides with CO2 and water across different temperature ranges were clarified, which revealed the superior capability of the Fe/Mn-based oxygen carriers for CO2 reduction at high temperatures and the great hydrogen production potential of Mn/Cu/Ce-based oxygen carriers at low temperatures. The results indicate that high temperatures can promote the reduction of CO2 by iron, manganese, and their reduced oxides, with initial reaction temperatures of 708 °C for Fe and 935°C for Mn; in addition, the promoting effect becomes more pronounced at higher temperatures. Thermodynamically, manganese, copper, and cerium can spontaneously decompose water to produce hydrogen at relatively low temperatures. This study delineates the relative redox performance of various metals with CO2 and H2O at different temperatures, providing a thermodynamic theoretical basis for the screening and optimization of oxygen carriers in the chemical looping reactions.
🔗 Provenance — このレコードを発見したソース
- scidb https://doi.org/10.57760/sciencedb.j00124.00430first seen 2026-08-07 05:58:06
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