ИСТИНА

The zwitterion (ZI) compound with H3PMo12O40 or H3PW12O40 immobilized on γ-Al2O3 and Perlkat 97-0 silica gel is a new effective solid catalyst for oxidative desulfurization (ODS) of diesel fuel under mild condition. The catalysts represent supported ionic liquid phases (SILPs). We have previously shown that the use of ZI (4-(3’- ethylimidazolium) butanesulfonate) promotes an increase in the efficiency of oxide heterogeneous catalysts for the oxidation of sulfur-containing compounds, including the thiophene series [1]. In this work, this IL was used to stabilize heteropolyanions on the surface of mineral carriers in order to obtain catalysts for the oxidative desulfurization of hydrocarbons. To establish the structure of catalysts a wide range of physicochemical methods was used, including surface-assisted laser desorption/ionization (SALDI) mass spectrometry. The prepared compositions were tested in the oxidation of various models (thiophene, dibenzothiophene, thioanisole in isooctane) and diesel fuel with hydrogen peroxide as the oxidant. As a result of the interaction of heteropoly acids with an ionic liquid, the anions of general formula PMe4 have stabilize on the surface. According to the literature, such HPA fragments are precursors to the active form of catalysts.The most effective catalyst, PMo/SiO2, ensure higher stability of heteropolyanions and make the catalyst stable over several successive oxidation cycles despite the fact that the sulfur is converted to sulfuric acid after oxidation of the thiophene. Conversion rate for this catalyst (TOF) was 140 h-1 for thiophene, 190 h-1 for dibenzothiophene, and 1230 h-1 for thioanisole, per mole of HPA.