VOx species supported on Al2O3–SBA-15 prepared by the grafting of alumina onto SBA-15: structure and activity in the oxidative dehydrogenation of ethane

Botková, Šárka; Čapek, Libor; Setnička, Michal; Bulánek, Roman; Čičmanec, Pavel; Kalužová, Alena; Pastva, Jakub; Zukal, Arnošt

doi:10.1007/s11144-016-1036-3

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…On the other hand, oxygen (O 2 ) addition to the reaction medium, known as oxidative dehydrogenation (ODH), can address the drawbacks of the existing DH processes. ODH is a lower-temperature process than either the thermal or nonoxidative catalytic processes, offering increased yields and energy savings. ,− As an exothermic and irreversible process, ODH can overcome the thermodynamic limitations of DH through the formation of water as a stable product. Moreover, ODH displays a large and positive equilibrium constant, with this equilibrium constant decreasing at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

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

Rostom¹,

Lasa

2017

Ind. Eng. Chem. Res.

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Propane oxidative dehydrogenation (PODH) was studied using VO x /γAl 2 O 3 and VO x /ZrO 2 −γAl 2 O 3 catalysts and consecutive propane injections. These catalysts were synthesized with 2.5, 5, and 7.5 wt % vanadium (V) loadings. Temperatureprogrammed reduction by hydrogen displayed one reduction peak for VO x /γAl 2 O 3 and two for VO x /ZrO 2 −γAl 2 O 3 (5 and 7.5 wt % vanadium). Temperature-programmed desorption of ammonia (NH 3 -TPD) and pyridine Fourier transform infrared spectroscopy showed that zirconia on γAl 2 O 3 reduces the catalyst acidity. NH 3 -TPD kinetics gave for VO x /ZrO 2 −γAl 2 O 3 higher desorption activation energies than those for VO x /γAl 2 O 3 . PODH runs in the Chemical Reactor Engineering Center Riser Simulator were developed under an oxygen-free atmosphere at 550 °C, close to 1 atm, 20 s, and a 42.0 catalyst/propane weight ratio (g/g). PODH runs for the 7.5% V/ZrO 2 −γAl 2 O 3 showed (a) 93% propylene selectivity and 25% propane conversion (based on propane converted into gaseous carbon-containing products), (b) 85% propylene selectivity at 28% propane conversion (based on propane converted including coke). The CO x selectivity remains at 2%. This makes the 7.5% V/ZrO 2 −γAl 2 O 3 catalyst a promising one for anticipated PODH industrial applications.

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Section: Introductionmentioning

confidence: 99%

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

Rostom¹,

Lasa

2017

Ind. Eng. Chem. Res.

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“…During the preparation of vanadium-based catalysts, it is crucial to control the vanadium content. Exceeding the theoretical monolayer of vanadium content results in the appearance of octahedral V 2 O 5 crystalline phases, with different polymerization deformations on the catalyst surface [67][68][69][70]. Therefore, it is essential to disperse tetrahedral VO 4 as much as possible on the catalyst surface to reduce the occurrence of crystalline phase V 2 O 5 .…”

Section: Vanadium-based Catalystsmentioning

confidence: 99%

Research Progress on Propylene Preparation by Propane Dehydrogenation

Zuo

2023

Molecules

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At present, the production of propylene falls short of the demand, and, as the global economy grows, the demand for propylene is anticipated to increase even further. As such, there is an urgent requirement to identify a novel method for producing propylene that is both practical and reliable. The primary approaches for preparing propylene are anaerobic and oxidative dehydrogenation, both of which present issues that are challenging to overcome. In contrast, chemical looping oxidative dehydrogenation circumvents the limitations of the aforementioned methods, and the performance of the oxygen carrier cycle in this method is superior and meets the criteria for industrialization. Consequently, there is considerable potential for the development of propylene production by means of chemical looping oxidative dehydrogenation. This paper provides a review of the catalysts and oxygen carriers employed in anaerobic dehydrogenation, oxidative dehydrogenation, and chemical looping oxidative dehydrogenation. Additionally, it outlines current directions and future opportunities for the advancement of oxygen carriers.

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“…Most ODH reactions are carried out in the presence of gaseous oxygen between 400 and 700 • C [22][23][24][25]. Catalytic ODH with gas phase oxygen faces challenges, given that it requires one to: (i) co-feed gaseous oxygen and alkanes with this leading eventually to an operation within the explosion region; and, (ii) use an oxygen that is costly and energy intensive to produce and which is manufactured via cryogenic air separation.…”

Section: Introductionmentioning

confidence: 99%

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

Rostom

Lasa

2020

Catalysts

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Catalytic propane oxidative dehydrogenation (PODH) in the absence of gas phase oxygen is a promising approach for propylene manufacturing. PODH can overcome the issues of over-oxidation, which lower propylene selectivity. PODH has a reduced environmental footprint when compared with conventional oxidative dehydrogenation, which uses molecular oxygen and/or carbon dioxide. This review discusses both the stoichiometry and the thermodynamics of PODH under both oxygen-rich and oxygen-free atmospheres. This article provides a critical review of the promising PODH approach, while also considering vanadium-based catalysts, with lattice oxygen being the only oxygen source. Furthermore, this critical review focuses on the advances that were made in the 2010–2018 period, while considering vanadium-based catalysts, their reaction mechanisms and performances and their postulated kinetics. The resulting kinetic parameters at selected PODH conditions are also addressed.

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VOx species supported on Al2O3–SBA-15 prepared by the grafting of alumina onto SBA-15: structure and activity in the oxidative dehydrogenation of ethane

Cited by 8 publications

References 38 publications

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

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

Research Progress on Propylene Preparation by Propane Dehydrogenation

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

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VOx species supported on Al2O3–SBA-15 prepared by the grafting of alumina onto SBA-15: structure and activity in the oxidative dehydrogenation of ethane

Cited by 8 publications

References 38 publications

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

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

Research Progress on Propylene Preparation by Propane Dehydrogenation

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

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Product

Resources

About

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

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