Oxidative desulfurization of dibenzothiophene catalyzed by α-MnO2 nanosheets on palygorskite using hydrogen peroxide as oxidant

Palygorskite (Pal)-supported α-MnO 2 nanosheets (Ns-MnPal) combine the adsorption features of Pal with the catalytic properties of α-MnO 2 nanosheets. They were prepared and examined in the catalytic oxidative desulfurization (ODS) of dibenzothiophene (DBT) from a model oil employing 30 wt% H 2 O 2...

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Bibliographic Details
Published in:RSC advances 2018-01, Vol.8 (32), p.17938-17943
Main Authors: Yu, Xingming, Han, Pingfang, Li, Ya
Format: Article
Language:English
Subjects:
Acetonitrile
Adsorption
Catalysis
Catalysts
Chemistry
Desulfurizing
Dibenzothiophene
Hydrogen peroxide
Manganese dioxide
Nanosheets
Reaction time
Scanning electron microscopy
Spectrum analysis
Sulfur
Sulfur removal
Thermogravimetric analysis
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:Palygorskite (Pal)-supported α-MnO 2 nanosheets (Ns-MnPal) combine the adsorption features of Pal with the catalytic properties of α-MnO 2 nanosheets. They were prepared and examined in the catalytic oxidative desulfurization (ODS) of dibenzothiophene (DBT) from a model oil employing 30 wt% H 2 O 2 as the oxidant under mild conditions. The supported catalyst was fabricated by the solvothermal method, and effective immobilization of α-MnO 2 nanosheets was confirmed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and N 2 adsorption. The influence of various solvents, solvent volume, reaction temperature, reaction time, catalyst amount and H 2 O 2 /sulfur molar ratio on ODS was investigated. Using 20 mL of acetonitrile as a solvent, maximum sulfur removal of 97.7% was achieved for ODS of DBT in 1.5 h using a Ns-MnPal/oil ratio of 0.2 g L −1 , reaction temperature of 50 °C and H 2 O 2 /sulfur molar ratio of 4. As solid catalysts, supported α-MnO 2 nanosheets could be separated from the reaction readily. The catalyst was recycled seven times and showed no significant loss in activity. Palygorskite (Pal)-supported α-MnO 2 nanosheets (Ns-MnPal) combine the adsorption features of Pal with the catalytic properties of α-MnO 2 nanosheets.
ISSN:2046-2069
DOI:10.1039/c8ra02396d