J.A. Montoya de la Fuente

Physicochemical properties of FSM-16 modified by fluoride and HPA

Mesoporous material FSM-16 has been modified by addition of ammoniumfluoride into the sysnthesis mixture (in-situ modification).After calcination at 863 K the samples were impregnated by phosphotungstic acid (HPA) and characterizedby XRD, FT-IR and 31 P MAS NMR. The long-range order of the impregnated samples were improved. In addition, HPA promotes the formation of both Bronted (B) and Lewis (L) acid sites. The presence of both F and HPA modifiers increases the B acid sites density, and the catalytic activity performance. Agood correlation between the B sites density and conversion ofn-hexane activity was observed.