2009
DOI: 10.1080/10916460802653954 View full text |Buy / Rent full text
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Abstract: Oxidative desulfurization (ODS) of dibenzothiophene (DBT) in n-octane with hydrogen peroxide/acetic acid using a quaternary ammonium coordinated ionic liquid (IL) (C 4 H 9 ) 4 NBr 2C 6 H 11 NO as catalytic solvent has been studied. The ODS mechanism by coordinated ionic liquid [(C 4 H 9 ) 4 NBr 2C 6 H 11 NO] was also carried out. The sulfur-containing compounds in model oil were extracted into ionic liquid phase and oxidized to their corresponding sulfones by H 2 O 2 . The effect factors for desulfurization of… Show more

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“…It has been reported that thiophenol in coal can be oxidized to disulfide using graphite and NaCl (1.0 M) as the anode and supporting electrolyte, respectively, at the first step at 3 V in 2 h; then, disulfide can be further oxidized to a sulfoxide (−SO) or sulfone (−SO 2 ), and some amount can be further hydrolyzed to SO 4 2– . , To some extent, this behavior is similar to chemical oxidation in which thiophene reacts with hydrogen peroxide or peracids to produce thiophene S-oxides and subsequently yields the usually very stable thiophene dioxides. These oxides can undergo Diels–Alder cycloaddition to form sesquioxides and be oxidized further by hydrogen peroxide to from SO 4 2– . Based on our results related to thiophene electro-oxidation, the two main detected products were thiophene-2­(5 H )-one, which was named as Tox (C 4 H 4 OS), and 3-hydroxythiophene-2­(3 H )-one, which was named as Thyox (C 4 H 4 O 2 S), and there could be some amount of oligomeric thiophene which can originate from thiophene electropolymerization on the surface of electrodes. Therefore, based on the two polar extracted products, a mechanism beyond the electrochemical oxidation of thiophene either for the high or low oxidation power anodes can be proposed.…”
Section: Resultsmentioning
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“…It has been reported that thiophenol in coal can be oxidized to disulfide using graphite and NaCl (1.0 M) as the anode and supporting electrolyte, respectively, at the first step at 3 V in 2 h; then, disulfide can be further oxidized to a sulfoxide (−SO) or sulfone (−SO 2 ), and some amount can be further hydrolyzed to SO 4 2– . , To some extent, this behavior is similar to chemical oxidation in which thiophene reacts with hydrogen peroxide or peracids to produce thiophene S-oxides and subsequently yields the usually very stable thiophene dioxides. These oxides can undergo Diels–Alder cycloaddition to form sesquioxides and be oxidized further by hydrogen peroxide to from SO 4 2– . Based on our results related to thiophene electro-oxidation, the two main detected products were thiophene-2­(5 H )-one, which was named as Tox (C 4 H 4 OS), and 3-hydroxythiophene-2­(3 H )-one, which was named as Thyox (C 4 H 4 O 2 S), and there could be some amount of oligomeric thiophene which can originate from thiophene electropolymerization on the surface of electrodes. Therefore, based on the two polar extracted products, a mechanism beyond the electrochemical oxidation of thiophene either for the high or low oxidation power anodes can be proposed.…”
Section: Resultsmentioning
“…Moreover, the recovery of the heterogeneous catalyst was convenient for the ODS system. 121 Related contributions on ODS using ILs as solvents, 122-127 or catalysts [128][129][130][131][132][133][134][135][136][137][138] have also been reported in the literature. Other deep desulfurization processes using ILs in the absence [139][140][141][142] or presence of oxidizing agents have also been patented.…”
Section: Conditions Of Desulfurization Observationsmentioning
“…By increasing the polarity and molecular mass of these species, the separation will be possible either by extraction or adsorption. The feasible oxidants are hydrogen peroxide, [3,9] organic peroxides, [10,11] oxygen, [12,13] fenton's reagent, [14] ferrat, [15,16] and ozone. [17] Since hydrogen peroxide is inexpensive, environmentally friendly, highly reactive and produces neutral byproducts like H 2 O, it became the most preferred oxidant for the CODS processes.…”
Section: Introductionmentioning