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Application of VIVO(acac)2 type complexes in the desulfurization of fuels with ionic liquids

Paper ID Volume ID Publish Year Pages File Format Full-Text
55348 47048 2012 7 PDF Available
Title
Application of VIVO(acac)2 type complexes in the desulfurization of fuels with ionic liquids
Abstract

The acetylacetonate complexes of oxovanadium(IV): VO(X-acac)2 (X = Cl, CH3 and CH3CH2) were structurally characterized in several alkylimidazolium ionic liquids by visible absorption and EPR spectroscopies. VO(Me-acac)2 and VO(Et-acac)2 showed solvatochromism in the selected ionic liquids (a λ1 shift of ca. 120 nm was observed) and most complexes showed two species in the anisotropic EPR spectra in several ionic liquids. It was shown that the ionic liquids anions have coordinating ability and the basicity order found was: NTf2− < OTf− < BF4−, in agreement with previous findings.An extraction and catalytic oxidation desulfurization (ECODS) system composed of VO(X-acac)2, H2O2 and ionic liquids was tested in the removal of benzothiophene (BT), dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) from a model oil (n-octane) at ambient temperature. The influence of the catalyst, ionic liquid, substrate and the molar ratio of the oxidant (H2O2) and the S-containing molecule were examined. The reaction rates of the oxidative desulfurization reaction were found to increase with the molar ratio of H2O2 and the S-containing molecule, as expected, however a ratio of 4 was enough to achieve >95% conversion to sulfone. The ionic liquid that showed the best performance with all substrates was bmimNTf2. In bmimOTf and bmimBF4 the activity of all catalysts in the ECODS system was low to moderate, which is probably due to the higher coordinating ability of these anions.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (98 K)Download as PowerPoint slideHighlights► Vanadyl acetylacetonate complexes as desulfurization catalysts. ► Characterization of catalysts in ionic liquids by Vis and EPR spectroscopies. ► Ionic liquids anions are able to coordinate the metal ion. ► Application in extraction and catalytic oxidation desulfurization (ECODS). ► Ionic liquids with the least coordinating anions show the best performance in ECODS.

Keywords
Ionic liquids; Vanadium complexes; ECODS; Desulfurization of fuels
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 196, Issue 1, 30 November 2012, Pages 119–125
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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