MOO3-FE2O3 CATALYSTS - CHARACTERIZATION AND ACTIVITY FOR ISOPROPYL-ALCOHOL DECOMPOSITION

The vapour-phase dehydration and dehydrogenation of isopropyl alcohol (IPA) have been carried out over pure MoO3 and Fe2O3, produced by calc ination of ammonium heptamolybdate and of iron (III) nitrate respectiv ely, as well as MoO3 mixed with 0.5 and 50 mol % Fe2O3, Prepared from the same materials. All catalysts were calcined in air, in the tempera ture range 200-600-degrees-C for 5 h, and were characterized by therma l analysis (TG, DTA), XRD, IR and S(BET). Surface areas decreased with increasing calcination temperature, and the catalytic activity of the pure oxides MoO3 and Fe2O3, as well as Of MoO3-0.5 mol % Fe2O3, incre ased with their S(BET). The activity Of MoO3-50 mol % Fe2O3, which was independent of its S(BET), could be attributed to the increased inten sity of terminal Mo-O bonds as shown by IR spectra. The activation ene rgies for the decomposition of IPA over catalysts calcined at 250 and 500-degrees-C are tabulated.