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Molecules 2013, 18(11), 13691-13704; doi:10.3390/molecules181113691
Article

Deep Oxidative Desulfurization of Dibenzothiophene in Simulated Oil and Real Diesel Using Heteropolyanion-Substituted Hydrotalcite-Like Compounds as Catalysts

1,2
 and
1,*
1 School of Environmental Science and Engineering, Shandong University, Jinan 250100, China 2 College of Resource & Environment Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
* Author to whom correspondence should be addressed.
Received: 18 September 2013 / Revised: 29 October 2013 / Accepted: 31 October 2013 / Published: 5 November 2013
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Abstract

Three heteropolyanion substituted hydrotalcite-like compounds (HPA-HTLcs) including Mg9Al3(OH)24[PW12O40](MgAl-PW12), Mg9Al3(OH)24[PMo12O40] (MgAl-PMo12) and Mg12Al4(OH)32[SiW12O40] (MgAl-SiW12), were synthesized, characterized and used as catalysts for the oxidative desulfurization of simulated oil (dibenzothiophene, DBT, in n-octane). MgAl-PMo12 was identified as an effective catalyst for the oxidative removal of DBT under very mild conditions of atmospheric pressure and 60 °C in a biphasic system using hydrogen peroxide as oxidant and acetonitrile as extractant. The conversion of DBT was nearly 100%. As a result, because of the influence of the electron density and the space steric hindrance, the oxidation reactivity of the different sulfur compounds in simulated oil followed the order DBT > 4,6-dimethyldibenzothiophene (4,6-DMDBT) > benzothiophene (BT) > thiophene (TH). When the reaction is finished, the catalysts can be recovered from the acetonitrile phase by filtration. The recovered MgAl-PMo12 retains nearly the same catalytic activity as the fresh material. Moreover, MgAl-PMo12 was found to exhibit an ideal catalytic activity in the oxidative desulfurization of real diesel resulting in a total remaining sulfur content of 9.12 ppm(w).
Keywords: oxidative desulfurization; heteropolyanion; hydrotalcite-like compounds; hydrogen peroxide oxidative desulfurization; heteropolyanion; hydrotalcite-like compounds; hydrogen peroxide
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Yu, F.; Wang, R. Deep Oxidative Desulfurization of Dibenzothiophene in Simulated Oil and Real Diesel Using Heteropolyanion-Substituted Hydrotalcite-Like Compounds as Catalysts. Molecules 2013, 18, 13691-13704.

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