Kinetics of Mixing-Assisted Oxidative Desulfurization of Dibenzothiophene in Toluene Using a Phosphotungstic Acid/Hydrogen Peroxide System: Effects of Operating Conditions

doi:10.1021/acs.energyfuels.7b01773

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Title:	Kinetics of Mixing-Assisted Oxidative Desulfurization of Dibenzothiophene in Toluene Using a Phosphotungstic Acid/Hydrogen Peroxide System: Effects of Operating Conditions
Authors:	de Luna, Mark Daniel G. Wan, Meng-Wei Golosinda, Lucille R. Futalan, Cybelle M. Lu, Ming-Chun
Contributors:	Univ Philippines, Natl Grad Sch Engn, Dept Chem Engn Univ Philippines, Natl Grad Sch Engn, Environm Engn Program Chia Nan Univ Pharm & Sci, Dept Environm Resources Management Natl Res Ctr Disaster Free & Safe Ocean City
Keywords:	Deep Desulfurization Ionic Liquids Fuel-Oil Sulfur-Compounds Diesel Fuel Gas Oil Catalyst Ultrasound Acid Gasoline
Date:	2017-09
Issue Date:	2018-11-30 15:51:04 (UTC+8)
Publisher:	Amer Chemical Soc
Abstract:	Mixing-assisted oxidative desulfurization (MAOD) of model fuel that contains dibenzothiophene (DBT) using phosphotungstic acid (HPW) as a catalyst and hydrogen peroxide (H2O2) as an oxidant was evaluated. Characterization analysis of HPW shows that the average crystallite size is 82.39 nm, with a disintegrated structure and morphology. The effect of operating parameters, such as mixer speed (5000-10 000 rpm), tetraoctylammoniurn bromide [phase-transfer agent (PTA)]/HPW ratio (0.5:1-5:1), and temperature (25-60 degrees C), on the sulfur conversion of DBT was examined. Results show that the sulfur conversion increases with an increasing temperature and mixer speed and a lower amount of PTA. The highest sulfur removal and rate constant of 100.0% and 0.1528 min(-1), respectively, were attained under the following conditions: 1:1 ratio, 40 degrees C, and 10 000 rpm. The pseudo-first-order equation and Arrhenius equation were applied to determine the kinetic rate constant and activation energy of HPW in the oxidation of DBT in a MAOD system. High correlation coefficient values (R-2 >= 0.93) indicate that the pseudo-first-order equation has the goodness of fit in describing the experimental kinetic data. Moreover, the activation energy of HPW derived from the Arrhenius equation was 42.60 kJ/mol.
Relation:	Energy & Fuels, v.31, n.9, pp.9923-9929
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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