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EDX element mapping of Fe–Ni. (A) After DRM (1023 K, CH4/CO2/He = 1.1/1/1, total pressure of 101.3 kPa, reaction time 1 h). (B) After CO2 oxidation (1 mL/s of CO2 at a total pressure of 101.3 kPa and 1123 K). Red, green and blue colors correspond to carbon, Fe and Ni elements respectively. Obtained from [118].
