Ultra-Deep Oxidative Desulfurization of Model Oil Catalyzed by In Situ Carbon-Supported Vanadium Oxides Using Cumene Hydroperoxide as Oxidant

摘要

A series of novel dispersed V2O5@Carbon composites, in which vanadium existed not only on the surface of carbon, but also in the matrix, were synthesized in situ from ammonium metava- nadate (NH4VO3) and ethylenediaminetetraacetic acid disodium salt dihydrate (EDTA-2Na). The structures and properties of prepared catalysts were characterized by diverse techniques. An efficient process for catalytic oxidative desulfurization with V2O5@Carbon and cumene hydroperoxide (CHP) was investi- gated. V2O5@Carbons is superior to the physically supported catalysts in reusability and stability. Results show that 99.8% sulfur in fuel can be removed and the catalyst can be recycled 7 times with no significant decrease in the desulfurization efficiency. A possible reaction mechanism is proposed, in which V(V)=O was oxidized to peroxo compounds (V(O)2) by CHP along with forming the 2-phenyl-2-propanol. The V(O)2 further cleaved to form electrophilic reactive VIV -O-O. species which could oxidize sulfur compounds to corresponding sulfones.