Immobilized VO–Schiff Base Complex on Modified Graphene Oxide Nanosheets as an Efficient and Recyclable Heterogeneous Catalyst in Deep Desulfurization of Model Oil

• Main Authors: Maryam Abdi, Abdollah Fallah Shojaei, Mohammad Ghadermazi, Zeinab Moradi-Shoeili
• Format: Article
• Language: English
• Published: Slovenian Chemical Society 2020-06-01
• Series: Acta Chimica Slovenica
• Subjects: vanadium; desulfurization; dibenzothiophene; graphene oxide; nanocatalyst.
• Online Access: https://journals.matheo.si/index.php/ACSi/article/view/5466

New heterogeneous catalyst was synthesized via covalent anchoring of oxovanadium(IV) complex of 5,5′-dibromobis(salicyledene)diethylenetriamine (VO[5-Br(Saldien)]) on the surface of chloro-modified graphene oxide (GO@CTS). The structure of the catalyst was investigated using different characterization techniques such as XRD, SEM, EDX, FT-IR, TG, DTA and ICP-AES analyses. The synthesized heterogeneous oxovanadium(IV) was an efficient catalyst for high yield and selective oxidation desulfurization (ODS) of dibenzothiophene (DBT) as a model oil using H2O2 as oxidant and formic acid as a promoter. The effects of the catalyst mass, reaction temperature and time, formic acid/H2O2 ratio and molar ratio of H2O2 to the total amount of sulfur (O/S) on oxidation desulfurization activity were investigated. Moreover, the prepared catalyst can be easily separated from the reaction mixture and reused six times without a significant loss of catalytic activity and selectivity.