Abstract
Catalytic oxidation of thioethers and thiophene derivatives with H2O2 was performed at 40°C and atmospheric pressure, in presence of W, V and Mo-containing layered double hydroxides (LDH). The aim of the study was to obtain information on the applicability of this reaction for the oxidative desulfuration of hydrocarbon mixtures or fuels. The catalysts were prepared by direct ion exchange with metal-oxoanions, i.e. WO42-, W7O246-, VO43-, V10O286-, MoO42- and Mo7O246-, of the LDH containing aluminum and magnesium atoms in the brucite layer. All catalysts showed good activity and selectivity in the sulfoxidation reaction, but the catalyst performances strongly depended on the nature of the anion species in the interlayer gallery. Thus, the W-based LDH was more active and more stable than the V-LDH and Mo-LDH catalysts.