| 초록 |
Mesoporous KIT-6 supported WO3 catalysts (with various WO3 loadings of 5, 10, 15and 20wt%) were synthesized by incipient impregnation method and used as the catalysts for oxidative desulfurization of model oil. The materials were well-characterized by X-ray diffraction (XRD), N2–adsorption, Scanning electron microscope (SEM), Transmission electron microscopy (TEM), H2-TPR and Raman spectroscopy. The results show that the WO3/KIT-6 catalyst with a WO3 content up to 10wt% can well dispersed on the support of mesoporous KIT-6, and from 15wt%, crystalline WO3 was generated. The application of these catalysts to the oxidative desulfurization (ODS) of aromatic sulfur compounds (dibenzothiophene, 4,6-dimethyldibenzothiophene, benzothiophene) with H2O2 was reported. The effects of reaction temperature, catalyst amount, and H2O2/S ratio on the desulfurization of DBT over 10wt% WO3/KIT-6 were studied in detail. And when the temperature increased to 70oC, treatment of BT, DBT, 4,6-DMDBT with 10wt% WO3/KIT-6 showed 100% removal of sulfur compounds in 2h. In addition, the catalyst could be recycled several times with only a slight reduction in catalytic activity after regenerated by calcination. |
