DFT Studies of carbon structures supported vanadia catalysts for oxidative dehydrogenation of propane: kinetic and thermodynamic

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ABDOLLAH FALLAH SHOJAEI

Abstract

The detailed mechanism for oxidative dehydrogenation of propane on the [1]VO4(CH3)3 surface has been studied in depth with density functional theory (DFT) calculations at the B3LYP level and standard split-valance basis set, 6-31+G*. All possible reaction pathways for the oxidative dehydrogenation (ODH) of propane by vanadia catalysts supported on carbon structure were examined. Monomeric vanadia specie was considered and modeled as catalysis. In addition, the mechanisms of the [2]complete catalytic cycle, involving the regeneration of the reduced catalyst using O2 gaseous have been reported. The reaction proceeds in two subsequent steps which at the first, one hydrogen abstracting by the vanadium of V=O1 group with about 48.35 cal/mol activation energy is the rate determining step. Subsequently, second intermediate has been formed through a bond formed between the propyl radical and O2 atom (V-O2). In continue, the O1 atom abstracts one hydrogen atom from the methyl group with a 131.63 kcal/mol barrier to form propene by passing to second transition state. The results of our calculations have found that all the reactions involve vanadyl oxygen (V=O1), with the bridging oxygen (V-O-C) serving to stabilize the isopropyl radical intermediate.


 



 

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How to Cite
FALLAH SHOJAEI, ABDOLLAH. DFT Studies of carbon structures supported vanadia catalysts for oxidative dehydrogenation of propane: kinetic and thermodynamic. Hacettepe Journal of Biology and Chemistry, [S.l.], v. 46, n. 1, p. 79-87, feb. 2018. ISSN 1303-5002. Available at: <http://hjbc.hacettepe.edu.tr/index.php/hjbc/article/view/47>. Date accessed: 20 june 2018.
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