Fig. 3. Redox property of dinuclear sites and identification of the active sites.

a H₂-TPR profiles of Mo₁/Fe₂O₃ (red line) with a 1.3 wt% Mo loading, α-Fe₂O₃ (blue line) and α-MoO₃ (black line). Insets: enlargements of the selected regimes together with the fitting data, and the curves of α-MoO₃ and α-Fe₂O₃ are omitted in the up-left and up-right insets, respectively, for clarity. b SCR rates (black square) at 270 °C and E_a (red circle) on Mo₁/Fe₂O₃ with the different Mo number. The error bars represent standard error.