Effect of Substitution of Cobalt for Iron in Sr4Fe6O13−( on the Catalytic Activity for Methane Combustion

A series of mixed oxides Sr4Fe6−xCoxO13−δ (x=0, 1, 2, 3, or 4) were prepared by sol‐gel method and used for catalytic combustion of methane. The structural properties of oxides were characterized by XRD, TGA, and XPS. The layered intergrowth perovskite‐like oxide Sr4Fe5CoO13−δ exhibits the highest catalytic activity for methane combustion under the experimental conditions. The enhanced catalytic activity of Sr4Fe5CoO13−δ for methane combustion could be attributed to the increased amount of oxygen vacancy caused by the partial substitution of cobalt for iron in the Sr4Fe6O13, which was confirmed by TGA and XPS.