Performance of Iron-Based Perovskite-type Oxides for Chemical Looping Dry Reforming of Methane

作者：Qiongqiong Jiang, Xin Yu, Jiaxin Xing, Xiangyu Sun, Yunfei Long, Hui Hong, Chao Xu · 发表于：Energy & Fuels · 年份：2024 · DOI：10.1021/acs.energyfuels.4c01480 · 被引用次数：23 · 研究领域：Chemical Looping and Thermochemical Processes、Catalysis and Oxidation Reactions、Catalytic Processes in Materials Science

Partial oxidation of methane has emerged as a promising approach for the effective utilization of methane. When combined with the thermochemical CO 2 reduction through the “chemical looping” concept, it can realize the coproduction of syngas and high-purity carbon monoxide. In this study, we proposed a chemical looping dry reforming of methane (CL-DRM) process by using iron-based perovskite-type oxides as oxygen carriers (OCs). This process has the potential to efficiently utilize low-grade solar heat and convert it into high-grade chemical energy. To identify efficient perovskite-type OCs, we synthesized and characterized LaFeO 3, SrFeO 3, La 0.5 Sr 0.5 FeO 3, SrFe 0.5 Ni 0.5 O 3, and LaFe 0.5 Ni 0.5 O 3 . The candidates were evaluated via H 2 /CH 4 temperature-programmed reduction and isothermal chemical looping redox cycles within the temperature range of 750–950 °C, revealing their potential for integration into the CL-DRM system. A series of characterization tests were tested to unveil the reaction mechanism for different iron-based perovskites. The results demonstrate that the introduction of nickel substitution enhances the activity of the iron-based perovskites, and lanthanum proves to be the more suitable A-site element for these materials. Among the candidates, LaFeO 3 shows the highest performance at 950 °C; LaFe 0.5 Ni 0.5 O 3 exhibits the best reactivity, CO selectivity, and carbon resistance at 750 and 850 °C. Our study is expected to facilitate the development ...