Reverse water-gas shift chemical looping (RWGS-CL) can be a promising process to convert CO2 to CO because of the low operating temperature and high efficiency to produce CO without any additional separation process. This study introduces La0.75Sr0.25FeO3 (LSF) and MeOx@LSF (MeOx: CeO2, NiO, Co3O4, and Co3O4-NiO) oxygen carriers for the RWGS-CL process. The structures of the prepared oxygen carriers are approved by the ICP-MS, XPS, and HAADF-STEM measurements. According to the results of the H2-CO2 redox cycles, metal oxide-perovskite composite particles showed a higher CO formation amount than the single perovskite particle. Subsequent H2-TPR and CO2-TPO processes revealed that the oxygen vacancy can be easily formed and regenerated at a relatively low temperature on the composite oxygen carriers. Co3O4-NiO@LSF demonstrated the highest productivity of CO with high cyclic stability, so it was selected as the most promising oxygen carrier for the RWGS-CL process.

Metal oxide-perovskite composite oxygen carriers for reverse water-gas shift chemical looping

ACS Fall 2021

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