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Title: Desulfurization of liquid fuels by extraction and sulfoxidation using H2O2 and [CpMo(CO)3R] as catalysts
Author: Julião, Diana
Gomes, Ana C.
Pillinger, Martyn
Valença, Rita
Ribeiro, Jorge C.
Gonçalves, Isabel S.
Balula, Salete S.
Keywords: Oxidative desulfurization
Ionic liquid
Hydrogen peroxide
Cyclopentadienyl molybdenum complexes
Issue Date: 15-Aug-2018
Publisher: Elsevier
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)3Me] (1), [CpMo(CO)3(CH2-pC6H4-CO2Me] (2) and [CpMo(CO)3CH2COOH] (3) as catalyst precursors. An ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, was used as both extractant and reaction medium, entrapping the active homogeneous MoVI catalysts that are formed in situ under the operating catalytic conditions (aqueous H2O2 as oxidant, 50 °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.
Peer review: yes
DOI: 10.1016/j.apcatb.2018.02.036
ISSN: 0926-3373
Appears in Collections:CICECO - Artigos
DQ - Artigos

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