Propane oxidative dehydrogenation over VOx/SBA-15 catalysts

Abstract

VO x /SBA-15 catalysts with five different vanadium loadings were prepared by a modified wet impregnation method, characterized using N 2 adsorption, XRD, EDX, SEM, Raman and UV-vis spectroscopies and H 2 -TPR techniques, and tested in the oxidative dehydrogenation of propane in the temperature range 450-600 • C. For all the catalysts the propane conversion increases with both reaction temperature and vanadium loading, while the selectivity for propene decreases mainly to the benefit of carbon oxides. Several types of VO x species coexist on the catalyst surface, with monomeric and low-polymerized ones leading mainly to propene, while V 2 O 5 crystallites at high vanadium loadings producing more carbon oxides. Propene was determined to be the only primary product irrespective of the vanadium content.

Non-oxidative dehydrogenation of isobutane over supported vanadium oxide: nature of the active sites and coke formation

“…1035 cm −1 assigned to the VO stretching mode of tetrahedral vanadate species. 12,20,27,78,79 Although the band observed around 1036 cm −1 is usually associated with the VO vibration of monomeric vanadate species, it would not be theoretically correct to exclude the possibility of the existence of polymeric vanadate species which may have VO vibration bands in close proximity. Thus, it can be suggested that the vanadium sites of the pristine catalyst mainly consist of V 2 O 5 nanocrystals and tetrahedral vanadate species.…”

One-pot synthesis of VO x /Al 2 O 3 as efficient catalysts for propane dehydrogenation

“…Vanadium, as a cost-effective and environmentally friendly metal, is an attractive alternative catalyst for PDH [7]. Although vanadium catalysts are mainly applied in the oxidative dehydrogenation of propane, researchers have found that they also displayed excellent catalytic performance and high stability for PDH [8,9]. For instance, Gong et al found that VO x /Al 2 O 3 catalysts prepared by the incipient wetness impregnation (IWI) method exhibited extremely high selectivity for propylene (80%) with 35% conversion of propane [5].…”

Catalytic Oxidation of C3-C4 Mixture Into Industrial Important Chemical Products

“…In the process of oxidative conversion of propane-butane mixture on various types of catalysts is possible to obtain a range of products such as oxygenates [2][3][4][5] , olefins [6][7][8][9] , hydrogen 10,11 , synthesis gas [12][13][14] and CO 2 + H 2 O 15 .…”