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FE-SEM images of reaction products obtained by reducing high-purity MoO3 with CO–15 vol % CO2 mixed gases at 932 K for different reaction extents (defined as the ratio of mass loss ratio of sample at time t to the theoretical maximum mass loss ratio from MoO3 to MoO2). (A) α1 = 0.0286; (B) α2 = 0.0895; (C) α3 = 0.2492; (D) α4 = 0.4965; (E) α5 = 0.8473; (F) α6 = 1. (α represents the reaction extent, α = 1 means reacting completely).
