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Mesostructured MnOx–Cs2O–Al2O3 nanocomposites have been synthesized by reverse microemulsion method combined with hydrothermal treatment and then applied to the catalytic combustion of methane. Compared to impregnation-derived conventional MnOx/Cs2O/Com-Al2O3 catalyst, the microemulsion-derived catalyst showed higher activity and stability for methane combustion. The T10% of the fresh and of the 72 h aged MnxO–Cs2O–Al2O3 were ∼475 and 490 °C, respectively, recommending it as a potential candidate catalyst for application in hybrid gas turbines. The homogeneous composition of the microemulsion-derived nanocomposite catalyst can hinder the loss of Cs+ and accelerate the formation of Cs–β-alumina phase, ensuring thus higher activity and stability for methane combustion. [Copyright &y& Elsevier]