Phylyppova L. Catalytic activity in CO oxidation and physical chemical properties of Fe-Mn and Fe-Cu oxide systems.

Catalytic activity and physical chemical properties of Fe-Mn and Fe-Cu oxide catalysts were studied. It was shown that the sample 30 mass % Fe - 70% mass Mn shows the highest catalytic activity in Fe-Mn oxide system and the sample 15 mass % Fe - 85mass% Cu - in Fe-Cu oxide system. The obtained data on specific surface have shown, that addition of iron oxide to copper oxide (in Fe-Cu oxide system) or to manganese oxide (in Fe-Mn oxide system) results to increase of specific surface. Thermal desorption investigations have shown, that hydroxyl groups have been formed on a surface layer of oxide catalysts and respond for conversion of CO into CO2 on the heterogeneous-homogeneous mechanism. Thermal desorption data have shown also that a2- form of CO2 was detected on surface layer of these oxide systems. The amount of this form correlates with catalytic activity and responds for CO oxidation. X-ray photoelectron spectroscopy data have shown that there are three forms of oxygen in a surface layer of binary oxide systems. The presence of hydroxyl and adsorbed oxygen results to increase of catalytic activity. Mossbauer spectroscopy investigations have shown, that availability of Fe3+ (magn.)-2 component increases the catalytic activity.