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
isbn	1873-7153
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