Characterisation and catalytic testing of VO /Al2O3 catalysts for microstructured reactors

Abstract

With regard to the application in a microstructured reactor, a special VO x /Al 2 O 3 catalyst powder (3 μm) was prepared and characterised by BET, XRD, UV/Vis DRS, and Raman spectroscopy. The higher the vanadium content, the higher the degree of polymerisation of the vanadium species on the support surface and the lower the BET surface area. Pelletised powders were tested in conventional tubular reactors for their catalytic performance in the oxidative dehydrogenation of propane. Their activity increases with vanadia loading, whereas selectivity towards propene decreases at iso-conversion. Catalytic benchmarking was performed to choose a reasonable catalyst for further investigations in a microreactor.

Impact of preparation method on physico-chemical and catalytic properties of VOx/γ-Al2O3 materials

“…Additionally, it can be observed that catalysts with higher VO x surface densities are not as selective as catalysts with a lower VO x surface density. This is in good accordance with the literature and previous experiments that were done by some of the present authors [30,41]. Interestingly, activity and selectivity behavior is almost identical for both catalytic materials that were obtained from very different preparation methods and vanadium precursors.…”

Novel F–V2O5/SiO2 catalysts for oxidative dehydrogenation of propane

“…Vanadia-based catalysts were active for oxidative dehydrogenation of lower alkanes, particularly propane [2][3][4][5]7]. When the active component was loaded on a suitable support with a proper amount, it led to promising yields of propene.…”

“…When the active component was loaded on a suitable support with a proper amount, it led to promising yields of propene. Many different supports were investigated, including TiO 2 [1,2], SiO 2 [3][4][5], c-Al 2 O 3 [7,8] and MgO [10]. Vanadia loading with monolayer dispersion differed from supports and depended on the binding ability of the active component and the support.…”

“…In recent years, oxidative dehydrogenation of propane (ODP) has been intensively investigated because of its significant advantages over the dehydrogenation process, which is presently utilized for producing alkene derivatives [1][2][3][4][5][6][7][8][9][10]. Vanadia-based catalysts were active for oxidative dehydrogenation of lower alkanes, particularly propane [2][3][4][5]7].…”

Insights into the catalytic production of hydrogen from propane in the presence of oxygen: Cooperative presence of vanadium and gold catalysts

“…Most efficient catalysts for the oxidative dehydrogenation of propane are based on vanadium oxide [8][9][10][11][12][13]. Vanadium supported on siliceous materials [8,9] or basic oxides, such as MgO [10,11] or alumina [12] are the most selective catalysts for the oxidative dehydrogenation of propane, which are remarkably more selective than bulk vanadium oxide [13]. However, bulk vanadium oxide resulted to be far more efficient than vanadia supported on alumina or silica for hydrogen production in the combined process, as bulk vanadium oxide was remarkably more efficient in the WGS reaction than the supported catalysts.…”