Abstract The thermodynamic equilibrium and efficiency analysis of the solar-driven Al2O3-based CH4 reforming and H2O splitting process is performed in two sections: (1) Al and syngas producing open process (AS), and (2) Al, syngas, and H2 producing semi-open process (ASH). The equilibrium analysis indicate that with the rise in the CH4/Al2O3 molar ratio, formation of Al and syngas (via methanothermal reduction of Al2O3) improves and reaches its maximum value at 2530 K (in case of CH4/Al2O3 molar ratio = 3). The efficiency analysis (for both cycles) is carried out at a steady thermal reduction temperature (TH) equal to 2530 K. In case of the ASH process, the water-splitting reactor is employed for the production of H2 and the effect of water splitting temperature (TL) on the process efficiency values is explored. Obtained results shows that the solar-to-fuel energy conversion efficiency in case of the ASH process is higher as compared to the AS process. Furthermore, this efficiency (in case of the ASH process) can be increased up to 50.7% via heat recuperation.

中文翻译：

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太阳能驱动的两步 CH 4 重整和使用 Al 2 O 3 的 H 2 O 裂解，用于联合生产 Al、合成气和 H 2

摘要 太阳能驱动的基于 Al2O3 的 CH4 重整和 H2O 裂解过程的热力学平衡和效率分析分为两个部分：(1) 铝和合成气生产开放过程 (AS)，和 (2) 铝、合成气和 H2生产半开放工艺（ASH）。平衡分析表明，随着 CH4/Al2O3 摩尔比的增加，Al 和合成气的形成（通过 Al2O3 的甲烷热还原）得到改善，并在 2530 K 时达到最大值（在 CH4/Al2O3 摩尔比 = 3 的情况下）。在等于 2530 K 的稳定热还原温度 (TH) 下进行效率分析（两个循环）。 在 ASH 过程中，水分解反应器用于生产 H2 和水分解的效果探讨了温度 (TL) 对过程效率值的影响。获得的结果表明，与 AS 工艺相比，ASH 工艺的太阳能到燃料的能量转换效率更高。此外，这种效率（在 ASH 工艺的情况下）可以通过热回收提高到 50.7%。