Control of Selectivity Based on the Diffusion Rates of the Reactants in the Oxidation of Mixed Hydrocarbons with Molecular Oxygen over Silica-coated Pt Catalysts.

Pt metal catalyst covered with silica layers oxidized methane preferentially in the competitive oxidation of methane and isobutane with gaseous oxygen. Selectivity in the competitive oxidation of mixed hydrocarbons over the catalyst was controlled by the diffusion rates of the reactants in the silica layers which wrapped Pt metal particles. [ABSTRACT FROM AUTHOR]