Investigation of the viability of the erbium oxide‐based solar thermochemical CO₂ splitting cycle is reported. This study aimed to explore the effect of partial thermal reduction (TR) of Er₂O₃ on the thermodynamic process parameters desirable to design a solar reactor system for the erbium oxide‐based CO₂ splitting (ErO‐CS) cycle. First, the percentage TR of Er₂O₃ is estimated as a function of the TR temperature ( $T_H$). Acquired results indicated that to achieve a percentage TR of Er₂O₃ in the range of 5–100%; the solar reactor has to be functioned in the temperature range of $T_H$ = 2327–2677 K. The solar energy required to drive the ErO‐CS cycle ( ${\dot{Q}}_{\text{solar-cycle-ErO-CS}}$) was observed to be on the higher side due to the obligation of the elevated values of $T_H$. This rise in the ${\dot{Q}}_{\text{solar-cycle-ErO-CS}}$ as a function of percentage TR of Er₂O₃ reflected in a decrease in the solar‐to‐fuel energy conversion efficiency ( ${\eta }_{\text{solar-to-fuel-ErO-CS}}$). The maximum ${\eta }_{\text{solar-to-fuel-ErO-CS}}$ = 4.04% is achieved for a percentage TR of Er₂O₃ = 25% ( $T_H$ = 2432 K). By employing 100% heat recuperation, the ${\eta }_{\text{solar-to-fuel-ErO-CS}}$ (for percentage TR of Er₂O₃ = 25%) increased up to 5.79%. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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通过基于氧化b的氧化还原循环进行的二氧化碳的太阳能热化学转化

报告了对基于氧化oxide的太阳热化学CO ₂分解循环的可行性的研究。这项研究旨在探讨Er ₂ O ₃的部分热还原（TR）对热力学过程参数的影响，这些参数对于设计用于基于氧化oxide的CO ₂分解（ErO-CS）循环的太阳能反应器系统是理想的。首先，估算Er ₂ O _3的TR百分比是TR温度的函数（${Ť}_H$）。获得的结果表明，要使Er ₂ O ₃的百分比TR达到5-100％；太阳能反应器必须在以下温度范围内工作${Ť}_H$ = 2327–2677K。驱动ErO-CS周期所需的太阳能（ ${\dot{问}}_{\text{太阳周期ErO-CS}}$）由于较高的值的义务被观察到较高的一侧 ${Ť}_H$。这种上升${\dot{问}}_{\text{太阳周期ErO-CS}}$与Er ₂ O ₃的百分比TR的函数关系，反映为太阳能转化为燃料的能量转换效率的降低（${\eta }_{\text{太阳能ErO-CS}}$）。最大值${\eta }_{\text{太阳能ErO-CS}}$Er ₂ O ₃的百分比TR = 25％（= 4.04％${Ť}_H$= 2432 K）。通过采用100％的热量回收，${\eta }_{\text{太阳能ErO-CS}}$（对于Er ₂ O _3的TR百分比= 25％）增加到5.79％。©2020年化学工业协会和John Wiley＆Sons，Ltd.