Oxidative desulfurization (ODS ) of model fuel in supercritical conditions

In this experiment for High yield oxidative desulfurization of sulfur containing compound such as DBT BT under catalytic and supercritical conditions, Using Mo/ γ-Al2O3 as a catalyst First, Mo/γ-Al2O3 catalysts were prepared using an impregnation method and were characterized using X-ray diffraction and FT-IR . catalytic system Mo/γ-Al2O3 and H2O2 has been found suitable for the deep removal of sulfur in model fuelAmong catalysts tested, Mo/γ-Al2O3 5% prepared by a conventional impregnation method was considerably active for the oxidation of thiophene, BT and DBT, which could achieve higher than 88.2% conversions at lower reaction temperature (≤315 K). Then, Substrate Dibenzothiophen was respectively dissolved in n-hexane to get model fuels with the sulfur concentration of 1200 ppm (l.2 g/L). A mixture of the catalyst (10 mg), model fuel (15mL), CTAB (3 mg) and deionized water was added into three- necked flask equipped with a cryogenic-liquid con- denser and an air pump. After continuous stirring for 4 h, the resulting mixture was filtered. The filtrate was quantitatively analyzed by gas chormotography with flame- ionzation detection(GC-FID).Then combine Oxidative desulfurization catalytic (ODS ) system and Supercritical condtions such as supercriticalwater (SCW) and supercritical CO2 of heavy oils reduces sulfur content and decreases average molecular weight, without rejecting carbon as coke products.