Abstract
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.
Highlights
Propylene is one of the most important building blocks in the petrochemical industry [1,2,3].It is industrially employed to produce polypropylene, which is used extensively to make packaging and labeling, textile products, laboratory equipment, loudspeakers, and automotive components.Propylene is used for the manufacturing of acrylonitrile, propylene oxide derivatives, and other substances [4,5]
propane oxidative dehydrogenation (PODH) approach, while considering vanadium-based catalysts, with lattice oxygen being the only oxygen source. 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 anticipated product molar fractions for gas phase PODH led to limited propylene selectivity with significant yields of the undesirable CO2 and ethylene [29,30]
Summary
Propylene is one of the most important building blocks in the petrochemical industry [1,2,3]. CDH displays similar constraints as steam cracking and FCC, with these being, as follows: a) they involve endothermic reactions and b) they require operating temperatures in the 450–700 ◦ C range At these high temperatures, cracking and coking can occur, which limits the use of potentially valuable catalysts, such as Cr2 O3 /Al2 O3 and. The anticipated product molar fractions for gas phase PODH led to limited propylene selectivity with significant yields of the undesirable CO2 and ethylene [29,30] Given these facts, the discovery of alternative catalytic pathways for PODH to improve the homogenous PODH is a requirement. This shows that the PODH is unconstrained by chemical equilibrium at the anticipated selected process conditions. One can see that there is a host of other undesirable secondary (20)
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