Influence of the preparation methodology on the reactivity and characteristics of Fe-Mo-oxide nanocrystals stabilized inside pentasyl-type zeolites

The CVD (Chemical Vapor Deposition) preparation of small Fe-Mo oxide clusters inside pentasyl-type zeolites (ZSM-5, boralite, silicalite and Fe-silicalite), the effect of preparation variables, and the differences with respect to preparation by impregnation or grafting procedures were studied with reference to the reactivity of the samples in p-xylene selective oxidation. The results indicate that small Fe-Mo-oxide particles inside the zeolite channels have significantly better properties of selectivity in mono- and dialdehyde formation than bulk Fe-Mo-oxide, but the catalytic behavior depends considerably on both the preparation methodology and the nature of the zeolite.