Deep oxidative desulfurization of diesel fuels using homogeneous and SBA-15-supported peroxophosphotungstate catalysts
authors Juliao, D; Mirante, F; Ribeiro, SO; Gomes, AC; Valenca, R; Ribeiro, JC; Pillinger, M; de Castro, B; Goncalves, IS; Balula, SS
nationality International
journal FUEL
author keywords Peroxophosphotungstate; Oxidative desulfurization; Hydrogen peroxide; Real diesel desulfurization; Model fuel
keywords OIL REFINERY STREAMS; HYDROGEN-PEROXIDE; EPOXIDATION; POLYOXOMETALATE; MODEL; OLEFINS; PERFORMANCE; EXTRACTION; ALCOHOLS; SULFUR
abstract A combination of catalytic oxidation and extraction was used for the desulfurization of a model diesel containing benzothiophene, dibenzothiophene and 4,6-dimethyldibenzothiophene, or a real diesel sample with a sulfur content of 2300 ppm. The catalysts used were the soluble peroxo compound (nBu(4)N)(3){PO4[WO(O-2)(2)](4)} (PW4) and a supported material denoted as PW4@TMA-SBA-15 that was prepared by immobilization of PW4 in an ordered mesoporous silica (SBA-15) derivatized with propyltrimethylammonium groups (TMA). The supported catalyst was characterized by FT-IR, FT-Raman, P-31 and C-13 MAS NMR spectroscopies, powder X-ray diffraction and scanning electron microscopy. Under optimized conditions (H2O2/S molar ratio = 7, 70 degrees C, acetonitrile as extraction solvent), both catalysts led to complete desulfurization of the model diesel within a reaction time of 2 h. The desulfurization systems could be recycled 10 times with only a slight decrease in performance being observed between the 9th and 10th oxidative desulfurization cycles. Application of the PW4 system to the real diesel led to an outstanding desulfurization efficiency of 89% after a reaction time of 2 h.
publisher ELSEVIER SCI LTD
issn 0016-2361
year published 2019
volume 241
beginning page 616
ending page 624
digital object identifier (doi) 10.1016/j.fuel.2018.11.095
web of science category Energy & Fuels; Engineering, Chemical
subject category Energy & Fuels; Engineering
unique article identifier WOS:000458760500062
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journal impact factor 4.908
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