Chemical Looping Dry Reforming of Methane: In-Situ Activation of Fe 2 O 3 /CeO 2 Oxygen Carrier

作者：Jinrui Zhang, Xiaozhi Liu, Yue Pan, Yue Pan, Peng Li, Yuanhui Shen, Yuhan Wang, Tianlong Yang, Dong Su, Ying Pan, Ying Pan, Hongguang Jin · 发表于：Energy & Fuels · 年份：2025 · DOI：10.1021/acs.energyfuels.5c04173 · 被引用次数：4 · 研究领域：Chemical Looping and Thermochemical Processes、Advancements in Solid Oxide Fuel Cells、Iron and Steelmaking Processes

Chemical looping dry reforming of methane holds great promise for both CO 2 utilization and syngas production with high efficiency. The structure and composition of oxygen carriers are critical factors influencing CL-DRM performance. Incorporating CeO 2 is known to enhance the reactivity and stability of Fe 2 O 3 in chemical looping reforming. However, the underlying mechanism of how CeO 2 synergistically interact with Fe 2 O 3 to enhance performances remains unclear. In this work, we comparatively investigated CeO 2 -supported Fe 2 O 3 OCs in interfacial and physical Fe–Ce contact modes. We found the sol–gel-synthesized Fe 2 O 3 /CeO 2 OC is in-situ activated within the first cycle and transforms to pure CeFeO 3 through a strong Fe 2 O 3 –CeO 2 interaction. The activated CeFeO 3 achieves over 80% CH 4 conversion, 96% CO selectivity, and excellent stability due to the sufficient Fe–Ce interaction, proper valence state, and low-energy barrier for oxygen diffusion. Additionally, in-situ environmental transmission electron microscopy study shows that the Fe 2 O 3 –CeO 2 interaction promotes the oxygen release of both oxides during reduction. Under the oxidative conditions, iron exhibits significant activity to dissolve into the CeO 2 lattice and form CeFeO 3 . The investigation into the activation mechanism of the Fe 2 O 3 /CeO 2 material provides valuable insights for designing straightforward and cost-effective OCs.