Catalytic Oxidative Desulfurization of Diesel Fuel Catalyzed by Quaternary Ammonium Phosphomolybdate

• 1、Wuhan University of Science and Technology

Abstract：Phosphomolybdic acid mixed with hexadecyl trimethyl ammonium chloride as the catalyst was prepared and evaluated for the oxidative desulfurization of straight-run diesel using hydrogen peroxide as an oxidant. Results of the FT-IR and SEM analyses indicated that the catalyst keeps the entire Keggin structure of phosphomolybdic acid. The catalyst can oxidize the sulfur-containing molecules into sulfones with desulfurization rate of 84.6% and diesel recovery rate of 98.1% in 2 h. Orthogonal test and single factor analysis showed that the catalyst dosage, hydrogen peroxide dosage, reaction temperature and reaction time are the main influential factors for oxidative desulfurization, and the influential factors order is: reaction time > reaction temperature > hydrogen peroxide dosage > catalyst dosage. Increasing extraction times, the desulfurization rates increased, but the recovery rates of diesel declined notably. The proposed catalytic oxidative mechanism of organosulfur compounds contains two steps, the active center Mo(Ⅵ) attacked by hydrogen peroxide catalyzes sulfide to form sulfoxide and subsequent oxidation of sulfoxide to produce sulfone.

keywords： Oxidative desulfurization diesel fuel quaternary ammonium salts phosphomolybdic acid mechanism

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