Structure properties and catalytic performance in methane combustion of double perovskites Sr2Mg1−xMnxMoO6−δ

▶ SOFC anode materials Sr2Mg1−xMnxMoO6−δ prove active catalysts for CH4 combustion. ▶ Catalytic property depends on degree of Mn substitution in Sr2Mg1−xMnxMoO6−δ. ▶ Optimal Mn substitution x = 0.5 leads to the highest activity for Sr2Mg0.5Mn0.5MoO6−δ. ▶ Higher oxygen vacancy concentration promotes activity for Mn-containing catalysts. ▶ Catalytic performance correlates with Mn-relating surface lattice oxygen species.