FUEL 31 |
| This contribution describes the oxidation of several model S-containing molecules with hydrogen peroxide in a two Liquid–Liquid (L–L) phase system using a heterogeneous catalyst under atmospheric pressure in the 333-353 K temperature range. Molybdenum and tungsten compounds are heterogeneized by anion exchange with alkylammonium derivatives covalently anchored to silica gel, these solids are robust heterogeneous catalysts able to activate selectively hydrogen peroxide to remove sulfur compounds via oxidation. The influence of reaction temperature, nature of the substrate, solvent, molar ratio of the oxidant (H2O2) and S-containing molecule, were examined. The reaction rates of the oxodesulfurization (ODS) reaction were found to increase with temperature, and molar ratio of H2O2 and S-containing molecule. The potential of this methodology is illustrated by the complete S-removal from a 5.0 wt% dibenzothiophene mixture at 353 K, under excess of hydrogen peroxide oxidant in less than 3 h of reaction. |
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Green Chemistry for Sustainable Energy Supply and Conversion
1:45 PM-5:40 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 242, Oral
Division of Fuel Chemistry |