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The reduction kinetics of iron-based oxygen carriers significantly affect the efficiency of chemical looping hydrogen generation. Based on the thermodynamics properties of the Fe–CO–CO2 system, CO/CO2 mixtures in different volume ratios can decouple the reduction of Fe2O3 into three relatively independent steps. The step-wise reduction of Fe2O3 was conducted in a thermogravimetric analyzer at 800–900 °C...