STRUCTURE AND CATALYTIC PROPERTIES IN THE OXIDATION OF CO OF FE-MN-ALOXIDE SYSTEMS PRODUCED BY MODIFIED ALKOXY SYNTHESIS

The results are presented of a study of the mechanism of formation, in the course of activation and oxidation of CO, of catalytically active Fe-Mn-Al oxide systems produced by modified alkoxy synthesis. Mossbau er spectroscopy and X-ray diffraction analysis established that the he at treatment of gel produces a complex oxide comprising a two-phase sy stem consisting of particles of Al-0 and X-ray-amorphous spinel Al-2-( x+y)FexMnyO3. It was established that the initial stage of CO oxidatio n by air oxygen on the catalytic system is characterized by a developm ent period during which heterogenization of the system continues with the formation of gamma-Fe2O3 and Mn2O3 clusters. The existence of ''le ft-hand'' hysteresis of the graph of CO conversion in oxidation by air oxygen has been found for the case of a Fe-Mn-Al oxide system. An exa mination has been made of a possible mechanism of oxidation, including the participation of terminal Fe=O and Mn=O bonds as active oxidation centres.