Figure 9. Thermodynamics study. Gibbs free energy of reduction by syngas (CO:H2 in a 1:1 molar ratio) as a function of the Gibbs free energy of reoxidation by CO2 for selected metal oxide pairs. The blue circle indicates the metal oxide pairs where reduction and oxidation can be considered sufficiently reversible for cyclic operation in a chemical looping redox process. Gibbs free energies were calculated at 1023 K using the reaction module in FactSage 6.4.181,182
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