Synergistic Effect in Ag/Fe-MnO2 Catalysts for Ethanol Oxidation

Here we report the synergistic effect of OMS-2 catalysts tested in ethanol oxidation, andthe effects produced by both the addition of an Fe modifier in the catalyst preparation stage, andthe introduction of Ag on its surface by the impregnation method. To analyze the action of eachcomponent, the Fe-modified, Ag-containing OMS-2 catalysts with different Mn/Fe ratios were pre-pared. Combined XPS and XRF elemental analysis confirms the states and distribution of the Ag- and Fe-containing species between the surface and bulk of the OMS-2 catalysts, which form highlydispersed Ag species on the surface of 0.05Fe-OMS-2, and are also incorporated into the OMS-2crystalline lattice. The cooperative action of Ag and Fe modifiers improves both reoxidation ability(TPO results) and the amount of adsorbed oxygen species on the catalyst surface. The introductionof Ag to the OMS-2 and 0.05 Fe-OMS-2 surface allows a high level of activity (T80 = 150-155 °C) andselectivity (SAc80 = 93%) towards the acetaldehyde formation.