This work introduced a perovskite catalytic particle of Fe₂O₃–NiO/La_0.8Sr_0.2FeO₃ as an oxygen carrier and investigated its long-term activity and stability in a novel methane Chemical Looping Reforming-Decomposition (CLRD) process. Carbon dioxide (CO₂) was injected for the oxidation of the reduced catalytic particle and its carbon deposit, resulting in the accelerated production of syngas. The catalytic particle showed over 97% of CH₄ conversion over 60min and the reduced catalytic particle was partially re-oxidized by both O₂ and CO₂ with the conversion of CO₂ into CO maintaining about 93% over 80min. The separate phases of Fe₂O₃/NiO were gradually merged to the single crystal phase of NiFe₂O₄ during the calcination of the two metal oxides and the continuous redox reaction cycle. The increased crystallinity can lead to the improvement of both activity and stability due to the enhanced oxygen-carrying capacity. The structure of the catalytic particle was well preserved and its activity has been stable in the long-term CLRD cycle with the combination of CO₂ utilization.

中文翻译：

---

钙钛矿型催化颗粒中Fe2O3-NiO到NiFe2O4的相变，以增强甲烷化学环的重整分解和CO2转化

这项工作介绍了一种以Fe ₂ O ₃ -NiO / La _0.8 Sr _0.2 FeO ₃为氧载体的钙钛矿型催化颗粒，并研究了其在新型甲烷化学回路重整分解（CLRD）工艺中的长期活性和稳定性。注入二氧化碳（CO ₂）以氧化还原的催化颗粒及其碳沉积物，从而加快了合成气的产生。催化颗粒在60分钟内显示超过97％的CH ₄转化率，并且还原的催化颗粒在转化为CO _2的同时被O ₂和CO ₂部分重新氧化在80分钟内将其转化为一氧化碳，保持约93％。在两种金属氧化物的煅烧和连续的氧化还原反应循环过程中，Fe ₂ O ₃ / NiO的分离相逐渐合并为NiFe ₂ O _4的单晶相。由于增加的载氧能力，增加的结晶度可以导致活性和稳定性的改善。结合使用CO ₂，催化颗粒的结构得到了很好的保存，并且在长期CLRD循环中其活性一直稳定。