Oxidative Desulfurization of Dibenzothiophene Using Cobalt (II) Complexes with Substituted Salen-Type Ligands as Catalysts in Model Fuel Oil

Three cobalt(II)-salen complexes (CoL1, CoL2 and CoL3) were synthesized via the reaction of the three tetradentate ligands as N , N ′-ethylenebis(salicylimine) L1, N , N ′-ethylenebis(3- tert -butylsalicylimine) L2 and N , N ′-ethylenebis(3,5-di- tert -butylsalicylimine) L3, with a stoichiometric am...

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Bibliographic Details
Published in:Catalysis letters 2021-03, Vol.151 (3), p.713-719
Main Authors: Tripathi, Deependra, Singh, Raj K.
Format: Article
Language:English
Subjects:
Acetonitrile
Analysis
Catalysis
Catalysts
Chemical synthesis
Chemistry
Chemistry and Materials Science
Cobalt
Coordination compounds
Desulfurizing
Dibenzothiophene
Dodecane
Fuel oil
Fuel oil industry
Fuel oils
Hydrogen peroxide
Industrial Chemistry/Chemical Engineering
Ligands
Nitriles
Organometallic Chemistry
Oxidation
Oxidizing agents
Physical Chemistry
Reaction kinetics
Solvents
Sulfur compounds
Thiophene
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Summary:Three cobalt(II)-salen complexes (CoL1, CoL2 and CoL3) were synthesized via the reaction of the three tetradentate ligands as N , N ′-ethylenebis(salicylimine) L1, N , N ′-ethylenebis(3- tert -butylsalicylimine) L2 and N , N ′-ethylenebis(3,5-di- tert -butylsalicylimine) L3, with a stoichiometric amount of cobalt(II) acetate tetrahydrate, respectively. All the three complexes were studied as oxidative desulfurization catalyst on dibenzothiophene taken in model fuel oil n-dodecane. The acetonitrile used as an extracting solvent and H 2 O 2 as an oxidant. Comparatively CoL3 proved to be the best catalyst which showed the 76% DBT removal at the optimized conditions. The nth-order kinetic model is the best way to represent oxidation kinetics of complexes. Graphic Abstract This cobalt(II) Schiffs base complexes were studied as catalyst for oxidative desulfurization of dibenzothiphene (DBT) taken as model sulphur compounds in fuel model oil (n-dodecane) using H 2 O 2 as oxidant and acetonitrile as extracting solvent for DBT sulfone in a batch experiment.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-020-03343-4