Desulfurization of liquid fuels by extraction and sulfoxidation using H2O2 and [CpMo(CO)(3)R] as catalysts
authors Juliao, D; Gomes, AC; Pillinger, M; Valenca, R; Ribeiro, JC; Goncalves, IS; Balula, SS
nationality International
journal APPLIED CATALYSIS B-ENVIRONMENTAL
author keywords Oxidative desulfurization; Extraction; Ionic liquid; Hydrogen peroxide; Cyclopentadienyl molybdenum complexes
keywords TEMPERATURE IONIC LIQUIDS; OXIDATIVE DESULFURIZATION; ROOM-TEMPERATURE; HYDROGEN-PEROXIDE; DEEP DESULFURIZATION; OLEFIN EPOXIDATION; MOLECULAR-OXYGEN; METAL CATALYSIS; MODEL DIESEL; SELECTIVE OXIDATION
abstract Efficient and recyclable liquid-liquid extraction and catalytic oxidative desulfurization (ECODS) systems for the removal of refractory sulfur compounds from liquid fuels are reported that use the cyclopentadienyl molybdenum tricarbonyl complexes [CpMo(CO)(3)Me] (1), [CpMo(CO)(3)(CH2-PC6H4-CO2Me] (2) and [CpMo(CO)(3)CH2COOH] (3) as catalyst precursors. An ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, was used as both extractant and reaction medium, entrapping the active homogeneous Mo-VI catalysts that are formed in situ under the operating catalytic conditions (aqueous H2O2 as oxidant, 50 degrees C). The high sulfoxidation activity of the catalyst formed from 1 was largely responsible for enabling > 99% desulfurization within 1 h of a model oil containing 1-benzothiophene, dibenzothiophene, 4-methyldibenzothiophene and 4,6-dimethyldibenzothiophene (2000 ppm S). The IL/catalyst phase could be repeatedly recycled with no loss of desulfurization efficiency. By sequentially performing extractive desulfurization and ECODS steps, 83-84% sulfur removal was achieved for untreated real diesel and jet fuel samples with initial sulfur contents of ca. 2300 and 1100 ppm, respectively.
publisher ELSEVIER SCIENCE BV
issn 0926-3373
year published 2018
volume 230
beginning page 177
ending page 183
digital object identifier (doi) 10.1016/j.apcatb.2018.02.036
web of science category Chemistry, Physical; Engineering, Environmental; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000429500100018
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journal impact factor 11.698
5 year journal impact factor 10.212
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