DFT Studies of Carbon Structures Supported Vanadia Catalysts for Oxidative Dehydrogenation of Propane: Kinetic and Thermodynamic

Authors : Abdollah Fallah SHOJAEI, Alimorad RASHIDI, Mina Ghiasi GHIASI, Robabe MOSAVI

Pages : 79-89

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Publication Date : 2018-03-01

Article Type : Research Paper

Abstract :The detailed mechanism for oxidative dehydrogenation of propane on the 1 VO4insert ignore into journalissuearticles values(CH3 );3 surface has been studied in depth with density functional theory insert ignore into journalissuearticles values(DFT); calculations at the B3LYP level and standard split-valance basis set, 6-31+G*. Monomeric vanadia specie was considered and modeled as catalysis. In addition, the mechanisms of the two 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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(V=O1);, with the bridging oxygen insert ignore into journalissuearticles values(V-O-C); serving to stabilize the isopropyl radical intermediate.
Keywords : Vanadia, propane, oxidative dehydrogenation, DFT calculation