This work provides a way to design oxygen carriers for chemical looping. Starting from Prussian blue microcubes, Zr-promoted Fe-based materials are developed for the conversion of CO₂ into CO. Thermally induced oxidative decomposition of ZrO₂-coated Prussian blue under the protection of the firstly formed ZrO₂ shell leads to the formation of hollow structured materials.

Detailed activity tests and in-situ characterization are used to investigate the relationship between material structure, stability and CO yield from CO₂ conversion. Throughout one hundred H₂-CO₂ redox cycles, 10 %Fe₂O₃/ZrO₂ exhibits a 27 times higher CO space-time yield (${86\text{m}\text{m}\text{o}\text{l}\bullet \text{s}}^{-1}\bullet {\text{k}\text{g}}_{\text{F}\text{e}2\text{O}3}^{-1}$) than unpromoted, yet hollow structured Fe₂O₃. This superior performance derives from the dual role that ZrO₂ plays: protecting the structure, thereby improving the iron oxide sintering resistance, and facilitating the reduction of iron oxide during redox cycles. The hollow structure and the interaction between Fe₂O₃ and ZrO₂ are the main reasons for the enhanced redox activity.

这项工作为设计用于化学环的氧气载体提供了一种方法。从普鲁士蓝微立方开始，开发了Zr促进的铁基材料，用于将CO ₂转化为CO。在首先形成的ZrO ₂壳的保护下，热诱导的ZrO ₂包覆的普鲁士蓝的氧化分解导致形成Pr 。空心结构材料。

详细的活性测试和原位表征用于研究材料结构，稳定性和由CO ₂转化产生的CO产量之间的关系。在整个一百个H ₂ -CO ₂氧化还原循环中，10％Fe ₂ O ₃ / ZrO _2的CO时空产率高27倍（${86\text{米}\text{米}\text{Ø}\text{升}\bullet \text{s}}^{--\mathrm{1个}}\bullet {\text{ķ}\text{G}}_{\text{F}\text{Ë}\mathrm{2个}\text{Ø}3}^{--\mathrm{1个}}$），而不是空心的结构化的Fe ₂ O ₃。ZrO ₂起到双重作用，即具有优异的性能：保护结构，从而提高氧化铁的烧结抗性，并促进氧化还原循环中氧化铁的还原。空心结构以及Fe ₂ O ₃和ZrO ₂之间的相互作用是氧化还原活性增强的主要原因。