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Raman spectrum of the spent Fe–Ni catalyst, with Ni/(Ni + Fe) ratio of 0.6 (DRM for 1 h, 1023 K, CH4:CO2 = 1.1, total pressure of 101.3 kPa). Blue line: pure graphite as a reference, black line: spent Fe–Ni catalyst, grey line: spent Fe–Ni catalyst after CO2-TPO up to 950 K, purple line: Spent Fe–Ni catalyst after CO2-TPO up to 1123 K. Obtained from [118].
