Morphologically uniform Pd/FexMn3−xO4-HP interfaces as the high-performance model catalysts for catalytic combustion of volatile organic compound

Abstract

Morphologically controlled synthesis and Fe doping of Mn3O4 hexagonal plates (Mn3O4-HP) with the basal (1 1 2) facet was accomplished in one-step to obtain the Fe-substituted FexMn3−xO4-HP on which the Pd(Ox) nanoparticles of ca. 4 nm (1 wt% Pd-basis) was loaded. The materials were used as the model catalysts for combustion of VOC (methyl acetate). These model catalysts exhibit high performances: Fe0.135Mn2.865O4-HP is as comparably active as Pd/Mn3O4-HP; and Pd/Fe0.135Mn2.865O4 gives the lowest T100 of 200 °C. The controlled Fe doping does not change the phase structure and basic morphology of Mn3O4-HP whereas enhances the exposure of the basal (1 1 2) plane. Fe doping increases the oxidation state of the Pd entity which in turn favors the formation of highly active oxygen species in greater amount. The measured Ea values also reflect the impact of Fe doping and Pd loading on the inherent potential of catalysts.