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http://dx.doi.org/10.7464/ksct.2019.25.1.091

Oxidative Desulfurization of Marine Diesel Using Keggin Type Heteropoly Acid Catalysts  

Oh, Hyeonwoo (Department of Chemical Engineering, Pukyong National University)
Woo, Hee Chul (Department of Chemical Engineering, Pukyong National University)
Publication Information
Clean Technology / v.25, no.1, 2019 , pp. 91-97 More about this Journal
Abstract
Oxidative desulfurization (ODS) has received much attention in recent years because refractory sulfur compounds such as dibenzothiophenes can be oxidized selectively to their corresponding sulfoxides and sulfones, and these products can be removed by extraction and adsorption. In this work, The oxidative desulfurization of marine diesel fuel was performed in a batch reactor with hydrogen peroxide ($H_2O_2$) in the presence of various supported heteropoly acid catalysts. The catalysts were characterized by XRD, XRF, XPS and nitrogen adsorption isotherm techniques. Based on the sulfur removal efficiency of promising silica supported heteropoly acid catalysts, the ranking of catalytic activity was: $30\;H_3PW_{12}/SiO_2$ > $30\;H_3PMo_{12}/SiO_2$ > $30\;H_4SiW_{12}/SiO_2$, which appears to be related with their intrinsic acid strength. The $30\;H_3PW_{12}/SiO_2$ catalyst showed the highest initial sulfur removal efficiency of about 66% under reaction conditions of $30^{\circ}C$, $0.025g\;mL^{-1}$ (cat./oil), 1 h reaction time. However, through the recycle test of the $H_3PW_{12}/SiO_2$ catalyst, significant deactivation was observed, which was attributed to the elution of the active component $H_3PW_{12}$. By introducing cesium cation ($Cs^+$) into the $H_3PW_{12}/SiO_2$ catalyst, the stability of the catalyst was improved with changing the solubility, and the $Cs^+$ ion exchanged catalyst could be recycled for at least five times without severe elution.
Keywords
Oxidative desulfurization; Marine diesel; Heteropoly acid (HPA); Hydrogen peroxide; Supported catalyst;
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Times Cited By KSCI : 1  (Citation Analysis)
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