Mouml;ssbauer analysis of Fe2O3ndash;MoO3supported on SiO2and Al2O3

摘要

Mouml;ssbauer analysis has been carried out for Fe2O3ndash;MoO3supported on SiO2and Al2O3with different surface areas. It has been found that the supports are not inert towards the active species. Both Fe and Mo, either substituting the cations of the supports or interstitially locating, enter the silica and the alumina. In the case of alumina, Al2(MoO4)3containing iron can also grow. However, these compound form only at the support surface: supported Fe (III) ndash;molybdate can grow only on this film.