Mesoporous
silicas of MCM-41 type modified by transition metal
oxides, such as molybdenum, vanadium, and tungsten, were synthesized.
These materials were characterized by low-temperature nitrogen adsorption/desorption,
Fourier transform infrared spectroscopy, X-ray spectral fluorescence
analysis, and transmission electron microscopy techniques and applied
for the removal of sulfur compounds in model and real fuels by oxidative
desulfurization. The catalysts obtained were tested under optimal
conditions. Dibenzothiophene was removed completely, and sulfur removal
in gasoline and diesel fractions could reach 91 and 63%, respectively.
These catalysts retain their activity in gasoline fraction desulfurization
for 5 cycles.
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