Desulfurization of model diesel by extraction/oxidation using a zinc-substituted polyoxometalate as catalyst under homogeneous and heterogeneous (MIL-101 (Cr) encapsulated) conditions
authors Juliao, D; Gomes, AC; Pillinger, M; Cunha-Silva, L; de Castro, B; Goncalves, IS; Balula, SS
nationality International
journal FUEL PROCESSING TECHNOLOGY
author keywords Oxidative desulfurization; Model diesel oil; Ionic liquid extraction; Polyoxometalate; MIL-101
keywords METAL-ORGANIC FRAMEWORK; PHASE-TRANSFER CATALYST; OXIDATIVE DESULFURIZATION; IONIC LIQUIDS; DEEP DESULFURIZATION; MESOPOROUS SILICA; PHOSPHOTUNGSTIC ACID; SULFUR-COMPOUNDS; HYDROGEN-PEROXIDE; EFFICIENT
abstract A composite material comprising the chromium terephthalate metal-organic framework MIL-101 and the tetrabutylammonium (TBA) salt of a zinc-substituted polyoxotungstate anion, TBA(4.2)H(0.8)[PW11Zn(H2O)O-39] ( denoted PW11Zn), has been prepared by an impregnation method and characterized by powder X-ray diffraction, scanning electron microscopy, N-2 adsorption/desorption, thermogravimetric analysis, FT-IR, FT-Raman and P-31 magic-angle spinning (MAS) NMR spectroscopies. The characterization data reveal that the polyoxometalate was homogeneously encapsulated within the cages of the support without affecting its crystalline structure and morphology. Both the homogeneous catalyst PW11Zn and the composite material PW11Zn@MIL-101 exhibit high activity in the extractive and catalytic oxidative desulfurization of a model oil containing dibenzothiophene, 1-benzothiophene and 4,6-dimethyldibenzothiophene. Complete desulfurization of the model oil could be achieved within 2 h by using the ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate as extraction solvent, aqueous 30% H2O2 as oxidant and a reaction temperature of 50 degrees C. When acetonitrile was used as extraction solvent instead of the IL, the heterogeneous catalyst PW11Zn@MIL-101 could be easily recovered and reused several times without leaching or loss of activity. (C) 2014 Elsevier B.V. All rights
publisher ELSEVIER SCIENCE BV
issn 0378-3820
year published 2015
volume 131
beginning page 78
ending page 86
digital object identifier (doi) 10.1016/j.fuproc.2014.10.030
web of science category Chemistry, Applied; Energy & Fuels; Engineering, Chemical
subject category Chemistry; Energy & Fuels; Engineering
unique article identifier WOS:000348881700010

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