The CO conversion values obtained for BaFeO2.90 and BaFeO2.78 oxides as a function of reaction temperature are shown in Figure . BaFeO2.96 catalytic results (Figure ) are not included in the main text, since oxidation at high temperatures allowed us to reach a higher iron oxidation state at the expense of lower specific surface area (<1 m 2 /g), rendering them hardly comparable. On the other hand, the other two samples exhibit similar textural properties as revealed by SEM (Figure ) and physisorption data (Table and Figure ).