Pd/Si3N4 catalysts: preparation, characterization and catalytic activity for the methane oxidation

Abstract Silicon nitride (Si 3 N 4 ) is a refractory material showing high thermal conductivity at high temperature. We can therefore expect very good stability for both the catalytic phase and the support when using it as a support of active phases, even for very exothermic reactions occurring at high temperature. Pd supported on silicon nitride catalysts were prepared by impregnation of Si 3 N 4 with Pd(II) acetylacetonate. The catalytic precursors were decomposed under oxygen at 350°C and reduced under hydrogen at 300°C; they were tested for the methane total oxidation reaction. Such catalysts were found to be highly stable, even after ageing at temperatures higher than 800°C under the reactive (oxidizing) mixture.