| Abstrakt: |
Phosphorus slag (P-slag) as a cost-effective source is used for the extraction of mesoporous silica SiO2. The composite materials of the Keggin-type heteropolyanions (HPAs) were anchored on SiO2and successfully prepared via an impregnation approach. Various approaches including X-ray diffraction, Brunauer–Emmett–Teller, inductively coupled plasma, field emission scanning electron microscopy-energy dispersive spectrum, ultraviolet–visible, temperature-programmed desorption, Fourier transform infrared, and transmission electron microscopy were employed to characterize the samples. HPAs supported on SiO2were employed for the oxidation of organic sulfur compounds [e.g., benzothiophene (BT), dibenzothiophene (DBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT)] from the model fuel. HPA-loaded SiO2catalysts illustrated outstanding catalytic activity in the oxidative desulfurization procedure. The removal performance of the DBT using Cs2W9V3/SiO2was greater than that using other materials under the optimum condition. The maximum level of DBT removal by Cs2W9V3/SiO2reached 100%. The removal performance of various substrates followed the order DBT > 4,6-DMDBT > BT. The Cs2W9V3-incorporated SiO2catalyst illustrated brilliant reusability five times with negligible reduction in performance. Besides, the kinetic studies exhibited that the desulfurization procedure on DBT-containing sulfur compound verified a pseudo-first-order kinetic model. The Arrhenius activation energy for the Cs2W9V3/SiO2catalyst obtained 47.2 kJ/mol. |
