Abstract
A series of vanadium–magnesium mixed oxides used for the propane oxidative dehydrogenation were synthesized by combining the impregnation and precipitation methods. Several techniques such as, FTIR, XRD and TPR-H 2 were applied to characterize physicochemical properties. XRD analysis confirms that the V–Mg–O oxides consist of Mg 3V 2O 8 structure with VO 4 tetrahedral units together with periclase phase. Magnesium incorporation with vanadium inhibits the formation of V 2O 5 containing exposed V O bonds. TPR-H 2 results show two peaks located between 500 and 750 °C, which, respectively, correspond to reduction of V 5+ species in distorted VO 4 units and V 5+ species belonging to bulk Mg orthovanadate. The highest activity and selectivity were obtained on catalysts in which isolated VO 4 tetrahedral are present. A relationship between reducibility degree of V 5+ distorted species (into unities VO 4), and catalytic activity was observed. In order to get a higher activity a maximum content of 45% as vanadium oxide.
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