COMBUSTION OF METHANE OVER SUPPORTED PALLADIUM-COPPER BIMETALLIC CATALYSTS

Monometallic and bimetallic catalysts based on palladium and copper de posited on a spinel carrier have been investigated in the catalytic co mbustion of methane. Great differences were found in catalytic activit y, according to the sequence Pd/MgAl2O4 > CuO-Pd/MgAl2O4 > Pd-CuO/MgAl 2O4 > CuO/MgAl2O4. They were explained by changes in surface compositi on of the catalysts. In the case of bimetallic catalysts the metallic surface is preferentially enriched in copper, which acts as a diluting agent for the Pd atom ensembles. As a consequence, the adsorption of reactants is limited and the catalysts so obtained behave like copper slightly doped with palladium.