I&EC 38 |
| Peroxotungsten and peroxomolybdenum complexes such as [WO(O2)2·Phen·H2O] and [MoO(O2)2·Phen] (Phen: 1, 10-phenanthrolinemonohydrate) have been synthesized and characterized. Catalytic oxidation of dibenzothiophene(DBT) remaining in n-octane with H2O2 in 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) and 1-n-octyl-3- methylimidazolium tetrafluoroborate ([Omim]BF4) has been investigated. When [Bmim]BF4 only was used as an extractant for DBT-containing model oil, a sulfur removal of 16.5% was obtained. After addition of 30wt. % H2O2 in [Bmim]BF4, a sulfur removal of 30% was given via chemical oxidation. When catalyst, H2O2 and [Bmim]BF4 were employed together, the sulfur removal increased sharply. In the case of the H2O2/WO(O2)2·Phen·H2O/[Bmim]BF4 system, extraction and catalytic oxidation decreased the S-content from 1000 ppm to 14 ppm, reaching a sulfur removal of 98.6%. However, the oxidative desulfurization system containing WO(O2)2·Phen·H2O and H2O2 only led to a sulfur removal of 50.3% in the absence of IL. The experiments demonstrated that a combination of catalytic oxidation and extraction in IL can deeply remove DBT from model oil. This result also indicated the remarkable advantage of this process over the desulfurization of model oil by mere solvent extraction with IL or mere catalytic oxidation without ionic liquids. |
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IEC Poster Session
8:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Industrial & Engineering Chemistry |