Oxidative desulfurization of dibenzothiophene with molecular oxygen using emulsion catalysis

Abstract

Dibenzothiophene (DBT) is oxidized to the corresponding sulfoxide and sulfone in an emulsion system (W/O) composed of polyoxometalate anion [C(18)H(37)N(CH(3))3](5)[PV(2)Mo(10)O(40)] as both the surfactant and catalyst, using molecular oxygen as the oxidant and aldehyde as the sacrificial agent under mild conditions.

Construction of Amphiphilic Polyoxometalate Mesostructures as a Highly Efficient Desulfurization Catalyst

“…[ 18,19 ] To overcome this obstacle, a number of amphiphilic POM catalytic systems, both homogeneous and heterogeneous, have been reported. Common systems include phase transformation, [ 20 ] encapsulation by dendritic cations, [ 21 ] microemulsion formation, [22][23][24] and immobilization into a polymer or silica matrix. [ 19 , 25,26 ] However, generally both homogeneous and heterogeneous systems suffer from limitations.…”

Oxidative Desulfurization of Fuels Catalyzed by Fenton‐Like Ionic Liquids at Room Temperature

“…Among these methods, oxidative desulfurization (ODS) is considered one of the most promising processes, owing to its advantages such as mild conditions and high efficiency and selectivity. [29][30] In this study, Fenton-like ionic liquids were synthesized from low-cost raw materials and used as catalysts, undergoing very low amounts of consumption and showing good oxidative ability. Deep desulfurization could be achieved in the desulfurization system containing [(C 8 H 17 ) 3 …”

Nanostructured Carbon–Metal Oxide Hybrids as Amphiphilic Emulsion Catalysts

“…For instance, we used Pd particles supported on SWCNT-SiO 2 as a catalyst in the hydrodeoxygenation of heavy oxygenated molecules (vanillin) and hydrogenation/etherification of aldehydes (glutaraldehyde and octanal), whereas SWCNT-MgO acted as a basic catalyst for cross-condensation reactions of ketones and aldehydes. [21] In conventional phase-transfer catalysis, [32][33][34] a liquid surfactant is typically used to enhance the transfer of molecules between phases, but this emulsion stabilizer cannot be recovered Nanohybrids composed of "onion-like" carbon, single-walled (SWCNTs) or multi-walled carbon nanotubes (MWCNTs) fused to silica or alumina particles have been compared as stabilizers of water/oil emulsions and interfacial catalysts. The amphiphilic character of these nanohybrids makes them effective in stabilizing emulsions (up to 85 % of total volume) comprising of small droplets (less than 40 mm).…”