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The effects of V and Ce concentrations (each varying in the 0–100% range) in vanadia–ceria multiphase systems are investigated for synthesis gas production  via  thermochemical redox cycles of CO 2  and H 2 O splitting coupled to methane partial oxidation reactions. The oxidation of prepared oxygen carriers is performed by separate and sequential CO 2  and H 2 O splitting reactions. Structural and chemical analyses of the mixed-metal oxides revealed important information about the Ce and V interactions affecting their crystal phases and redox characteristics. Pure CeO 2  and pure V 2 O 5  are found to offer the lowest and highest oxygen exchange capacities and syngas production performance, respectively. The mixed-oxide systems provide a balanced performance: their oxygen exchange capacity is up to 5 times higher than that of pure CeO 2  while decreasing the extent of methane cracking. The addition of 25% V to CeO 2  results in an optimum mixture of CeO 2  and CeVO 4  for enhanced CO 2  and H 2 O splitting. At higher V concentrations, cyclic carbide formation and oxidation result in a syngas yield higher than that for pure CeO 2 .

Concentration-Dependent Solar Thermochemical CO 2 /H 2 O Splitting Performance by Vanadia–Ceria Multiphase Metal Oxide Systems

Concentration-Dependent Solar Thermochemical CO ₂ /H ₂ O Splitting Performance by Vanadia–Ceria Multiphase Metal Oxide Systems