Effect of different additives on the performance of V−Mg−O catalysts in the oxidative dehydrogenation of propane

Effect of additives on properties of V2O5/SiO2 and V2O5/MgO catalysts

“…The selectivity to propene for the VMg catalyst without the additives, are lower than those reported in the literature (at comparable conversions) for catalysts of similar loading of vanadia phase and are close to those obtained for lower loadings of vanadia [34][35][36][37][38][39][40][41]. For VSi catalyst the selectivities are close to those reported by López Nieto et al [42] for similar loading of vanadia, and lower than in the data of Parmaliana et al [43].…”

Oxidative Dehydrogenation of Propane over Vanadia–Magnesia Catalysts Prepared by Thermolysis of OV(OtBu)3 in the Presence of Nanocrystalline MgO

“…Particular attention has been given to V-Mg-O catalysts since they exhibit relatively high propene selectivities at zero propane conversion (∼80%) and a lower loss in propene selectivity with increasing propane conversion than is observed for other vanadium-containing catalysts (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37). Structural investigations of V-Mg-O catalysts show no evidence for either isolated vanadyl or polymeric vanadate species, or crystallites of V 2 O 5 .…”

Optimization of V2O5?MgO/TiO2 catalyst for the oxidative dehydrogenation of propane effect of magnesia loading and preparation procedure

“…According to our results, no relation between reducibility and catalytic activity was found, taking into account that the catalyst with the best catalytic performance (5V-1.9Mg-Ti) exhibits temperature of maximum H 2 consumption higher than that of catalysts with lower activity. It is well known that oxidative dehydrogenation reaction over transition metal oxide catalysts involves the redox cycle between V þ5 and V þ4 and consequently a good redox behavior might be favorable [35][36][37]. Present results suggest that other factors than reducibility control the catalytic behavior.…”