The development of catalytic oxovanadium(IV)-containing microspheres for the oxidation of various organosulfur compounds

Authors: Adeniyi S. Ogunlaja, Samson Khene, Edith Antunes, Tebello Nyokong, Nelson Torto, Zenixole R. Tshentu

Abstract:
Thedevelopment ofpoly[allylSB-co-EGDMA] beads containing a tetradentate ligand was achievedvia suspension polymerization. The catalyst poly[allylSB-co-EGDMA]-VO was synthesized by reacting VIVOSO₄ with poly[allylSB-co-EGDMA]. XPS and EPR were used to confirm the presence of vanadium (V⁴⁺) on the beads. The synthesized catalyst (poly[allylSB-co-EGDMA]-VO) was found to have a BET surface area of 22 m² g⁻¹ and porosity of 135Å with the atomic force microscopy (AFM) showing more insight on the porous nature of the beads. Oxidation of thiophene (TH), benzothiophene (BT), dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) was carried out using tert-butyl hydroperoxide (t-BuOOH) as oxidant. An overall conversion of 60%, 82%, 98% and 87% was achieved for thiophene (TH), benzothiophene (BT), dibenzothiophene (DBT) and 4,6 dimethyldibenzothiophene (4,6-DMDBT) respectively at higher (t-BuOOH) to substrate ratio and at a temperature of 40 ^◦C. The efficient oxidation of the various organosulfur compounds presents potential for the possible application of this catalyst in oxidative desulfurization (ODS) of crude oil.

Keywords:
Vanadium(IV) catalyst
Oxidation
Organosulfur compounds
tert-Butyl hydroperoxide (t-BuOOH)

Published in: Applied catalysis A: General  (Volumes 462–463, Pages 1-310, 10 July 2013)

Publisher: Elsevier      

ISSN Information: 0926-860X

The development of catalytic oxovanadium(IV)-containing microspheres for the oxidation of various organosulfur compounds

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