Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9610208 | Catalysis Today | 2005 | 6 Pages |
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-H2 were applied to characterize physicochemical properties. XRD analysis confirms that the V-Mg-O oxides consist of Mg3V2O8 structure with VO4 tetrahedral units together with periclase phase. Magnesium incorporation with vanadium inhibits the formation of V2O5 containing exposed VO bonds. TPR-H2 results show two peaks located between 500 and 750 °C, which, respectively, correspond to reduction of V5+ species in distorted VO4 units and V5+ species belonging to bulk Mg orthovanadate. The highest activity and selectivity were obtained on catalysts in which isolated VO4 tetrahedral are present. A relationship between reducibility degree of V5+ distorted species (into unities VO4), and catalytic activity was observed. In order to get a higher activity a maximum content of 45% as vanadium oxide.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
L. Balderas-Tapia, I. Hernández-Pérez, P. Schacht, I.R. Córdova, G.G. Aguilar-RÃos,