Abstract
New data on the catalytic combustion of methane on Ni modified Pd/Al2O3 catalysts were obtained. NiAl2O4 spinel phase, not well definite Ni-Al phases, reducible at lower temperatures as well as finely dispersed NiO are formed on the surface after Ni deposition. When Pd is loaded on alumina modified with up to 5% Ni, the finely divided not well stabilized PdO particles are formed. PdO strongly interacting with surface is formed in Pd + 10% Ni/Al2O3. All three oxidation states Pd0, Pd2+ and Pd4+ are registered on the surface of the studied catalysts. The observed close catalytic activity of all nickel-modified catalysts is explained by the similar surface palladium concentration, which indicates that increasing the nickel content does not lead to a significant improvement in catalytic activity.
Published Version
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