Abstract
Catalytic micro-combustors have been developed via deposition of active layers of Pt/γ-Al 2O 3, LaMnO 3/γ-Al 2O 3 and Pt-LaMnO 3/γ-Al 2O 3 on FeCralloy and α-Al 2O 3 slabs. Diffusional resistance in the gas phase have been experimental excluded, even if catalyst is present on only one side of the reactor. Pt/γ-Al 2O 3 gave best performances in the combustion of H 2 while LaMnO 3/γ-Al 2O 3 revealed to be the best catalyst for methane combustion. The mixture Pt–LaMnO 3 supported on γ-Al 2O 3 showed intermediate properties for both fuels. The combustion of H 2–CH 4 mixtures showed that the presence of hydrogen promotes the oxidation of methane, since above 700 °C radical reactions involving CH 4 are activated by H 2 ignition.
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