Performance of Iron-Based Perovskite-type Oxides for Chemical Looping Dry Reforming of Methane
Qiongqiong Jiang, Xin Yu, Jiaxin Xing, Xiangyu Sun, Yunfei Long, Hui Hong, Chao Xu
Abstract
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 of efficient and clean methane conversion, while simultaneously advancing solar thermochemical fuel production and CO 2 utilization.