Fe-based oxygen carries (OCs) have attracted wide attention due to the low cost and environmental compatibility for chemical looping methane partial oxidation. However, they usually suffer from low CH₄ reactivity mainly due to insufficient synergy between catalytic CH₄ activation and lattice oxygen mobility. In this work, Fe ions with different amount were incorporated into a novel garnet structure (Y₃Fe_xAl_5-xO₁₂), which exhibited drastically increased CH₄ conversion with reduction time. This resulted from in-situ formed Fe⁰ sites at the early stage of reduction, which led to a more efficient reaction route involving methane catalytic decomposition on Fe⁰ and the resulted carbon oxidation easier by lattice oxygen, compared with methane directly oxidized by OCs. Moreover, the amount of Fe ions in garnet influenced surface exposed Fe⁰ sites and oxygen mobility, inducing Y₃Fe₂Al₃O₁₂ performed the best with almost 94 % methane conversion thanks to the combined advantages of larger surface exposed Fe⁰ and higher lattice oxygen mobility.

铁基载氧体（OCs）由于其低成本和对化学环甲烷部分氧化的环境兼容性而受到广泛关注。然而，它们通常遭受低CH ₄反应性的主要原因是催化CH ₄活化和晶格氧迁移率之间的协同作用不足。在这项工作中，不同数量的Fe离子被掺入一种新型的石榴石结构（Y ₃ Fe _x Al _5-x O ₁₂）中，随着还原时间的增加，其CH ₄转化率急剧增加。这是由于原位形成的Fe ⁰在还原的早期阶段，这导致了更有效的反应路线，其中包括甲烷催化的Fe ⁰催化分解，以及与OCs直接氧化的甲烷相比，晶格氧更容易导致碳氧化。此外，石榴石中的Fe离子数量影响了表面暴露的Fe ⁰位和氧迁移率，诱导Y ₃ Fe ₂ Al ₃ O ₁₂表现最佳，甲烷转化率几乎达到94％，这归因于更大的表面暴露Fe ⁰和更高的综合优势。晶格氧迁移率。