Citation: Ming Zhang, Wenshuai Zhu, Hongping Li, Suhang Xun, Meng Li, Yanan Li, Yanchen Wei, Huaming Li. Fabrication and characterization of tungsten-containing mesoporous silica for heterogeneous oxidative desulfurization[J]. Chinese Journal of Catalysis, ;2016, 37(6): 971-978. doi: 10.1016/S1872-2067(15)61103-2 shu

Fabrication and characterization of tungsten-containing mesoporous silica for heterogeneous oxidative desulfurization

Ming Zhang ^a, ,
Wenshuai Zhu ^b ,
Hongping Li ^b ,
Suhang Xun ^b ,
Meng Li ^b ,
Yanan Li ^b ,
Yanchen Wei ^b ,
Huaming Li ^a,b

a Institute for Energy Research, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
b School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

Received Date: 29 January 2016
Revised Date: 7 April 2016

Fund Project: This work was supported by the National Nature Science Foundation of China (21276117, 21376111, 21406092).

A series of functional, tungsten-containing mesoporous silica materials (W-SiO₂) have been fabricated directly from an ionic liquid that contained imidazole and polyoxometalate, which acted as mesoporous template and metal source respectively. These materials were then characterized through X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, Fourier transform infrared spectra (FTIR), diffuse reflectance spectra (DRS), and N₂ adsorption-desorption, which were found to contain tungsten species that were effectively dispersed throughout the structure. The as-prepared materials W-SiO₂were also found to possess a mesoporous structure. The pore diameters of the respective sample W-SiO₂-20 determined from the TEM images ranged from 2 to 4 nm, which was close to the average pore size determined from the nitrogen desorption isotherm (2.9 nm). The materials were evaluated as catalysts for the heterogeneous oxidative desulfurization of dibenzothiophene (DBT), which is able to achieve deep desulfurization within 40 min under the optimal conditions (Catalyst (W-SiO₂-20) = 0.01 g, temperature = 60 ℃, oxidant (H₂O₂) = 20 µL). For the removal of different organic sulfur compounds within oil, the ability of the catalyst (W-SiO₂-20) under the same conditions to remove sulfur compounds decreased in the order: 4,6-dimethyldibenzothiophene > Dibenzothiophene > Benzothiophene > 1-dodecanethiol. Additionally, they did not require organic solvents as an extractant in the heterogeneous oxidative desulfurization process. After seven separate catalytic cycles, the desulfurization efficiency was still as high as 90.3%. From the gas chromatography-mass spectrometer analysis, DBT was entirely oxidized to its corresponding sulfone DBTO₂ after reaction. A mechanism for the heterogeneous desulfurization reaction was proposed.
- Heterogeneous oxidative ,
- desulfurization,
- Tungsten species,
- Mesoporous silica,
- One-pot synthesis
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