Physicochemical Properties and Catalytic Performances of Nanostructured V2O5 over TiO2 and γ-Al2O3 for Oxidative Dehydrogenation of Propane

Abstract

Samples of V 2 O 5 catalysts supported on nanostructures of TiO 2 and γ-Al 2 O 3 were synthesized through the hydrothermal method and used for the oxidative dehydrogenation of propane (ODHP) to propylene. The TiO 2 support was utilized in both commercial microstructure and synthesized nanostructure forms. Moreover, the γ-Al 2 O 3 support was synthesized through chemical and precipitation methods. The vanadium catalyst was then deposited onto the hybrid of the TiO 2 and γ-Al 2 O 3 materials. All prepared catalysts were characterized through the BET, FESEM, FTIR, XRD and TPR techniques. Performances of the synthesized catalysts were subsequently examined in a fixed-bed reactor. The main products were propylene, ethylene and CO x . The prepared catalysts over TiO 2 and γ-Al 2 O 3 were evaluated under reactor test conditions of 500 °C, feed of C 3 H 8 /air with molar ratio of 0.6, and total feed flow rate of 90 mL min -1 . These resulted in optimum values of 35.53 and 23.88 % for the propylene selectivity and propane conversion, respectively 6 h after the start of the reaction. The comparison of performances made between the synthesized materials and those available in the open literature for the ODHP reaction was indeed satisfactory.

Propane Oxidative Dehydrogenation Using Consecutive Feed Injections and Fluidizable VOx/γAl2O3 and VOx/ZrO2–γAl2O3 Catalysts

“…Olefins are the important building blocks in the petrochemical industry. − Traditional processes for olefin production are steam cracking, fluid catalytic cracking (FCC), and catalytic dehydrogenation (DH). ,− Cracking and DH processes are endothermic reactions and require reactors that are operated at high temperatures, consuming large amounts of thermal energy. − Also, significant and undesirable amounts of coke can be formed in the reactors, imposing severe operating constraints with frequent plant shutdowns. ,,, …”

Propane Oxidative Dehydrogenation on Vanadium-Based Catalysts under Oxygen-Free Atmospheres

“…(b) Propane conversion calculated via Equation (27). This propane conversion provides a more accurate propane conversion than Equation (26), as it is dependent on the outlet product measured while using the outlet FID products [10,12,77,78].…”

“…The use of Equation 29is frequently not recommended, given that water measurements offers analytical challenges and is often inaccurate. As an alternative, Equation (30) using carbon containing species established using output product FID analysis [10,12,74,77,78] excluding water is strongly recommended. Furthermore, and regarding product yields, Equation (31) accounts for the product between propane conversion and propylene selectivity [12,[75][76][77][78].…”

Green Synthesis ZnO/TiO2 for High Recyclability Rapid Sunlight Photodegradation Textile Dyes Applications

“…Water purification methods were varied through a physical, biological, and chemical process [12,13]. The photocatalyst is one of the most effective and simple techniques used in water treatment because it removes organic contaminants easily [11,14,15].…”

“…The reported materials nanoparticles have been produced by using green synthesis are: Au, Ag, Pt, Pd, α-Fe2O3, CeO2-, ZnO, TiO2, ZrO2, and SnO2 [19][20][21][22]. TiO2 and ZnO are chemically stable semiconductors that can produce an active charge during irradiation by light with suitable wavelengths [12,23,24]. Zinc oxide is n-type semiconductor with high excitation binding energy, bandgap width (3,37eV for anatase phase), biocompatibility, and it is more active when irradiation by visible light.…”