Catalytic micro-combustors have been developed via deposition of active layers of Pt/gamma-Al2O3, LaMnO3/gamma-Al2O3 and Pt-LaMnO3/gamma-Al2O3 on FeCralloy and alpha-Al2O3 slabs. Diffusional resistance in the gas phase have been experimental excluded, even if catalyst is present on only one side of the reactor. Pt/gamma-Al2O3 gave best performances in the combustion of H-2 while LaMnO3/gamma-Al2O3 revealed to be the best catalyst for methane combustion. The mixture Pt-LaMnO3 supported on gamma-Al2O3 showed intermediate properties for both fuels. The combustion of H-2-CH4 mixtures showed that the presence of hydrogen promotes the oxidation of methane, since above 700 degrees C radical reactions involving CH4 are activated by H-2 ignition. (C) 2009 Elsevier B.V. All rights reserved.