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Oxidation Desulfurization of Liquid Fuels Using TiO2-based Photocatalysts

Ostovar, Abdollah | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55124 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad; Larimi, Afsaneh Sadat
  7. Abstract:
  8. Due to the increasing consumption of fuel, the use of new methods with high efficiency to remove sulfur from fossil fuels is felt more than ever. Hydrogenation and oxidation of sulfur organic matter, such as thiophenes, is an old method of desulfurization of liquid fuels. Using a photocatalyst, everything can be done in an environment that is very low cost. In this study, the photocatalytic elimination of dibenzothiophene was investigated. For this purpose, carbon-doped thiamine dioxide was used as the photocatalytic base, which is synthesized by hydrothermal method. This method is the same source of titanium and carbon. To increase the performance of the catalyst, platinum metal was loaded on a photocatalytic base by optical deposition method. The best performance was related to the concentration of 0.5% by mass of platinum in the photocatalyst, which after 1 hour of adsorption in the dark environment and 2.5 hours of photocatalytic reaction removes 98% of dibenzothiophene with an initial concentration of 250 mg / l. The concentration of photocatalyst used in the reaction mixture is 2 g / l. The optimal amount of hydrogen peroxide as an oxidizer is 0.2 ml. To increase the efficiency, a polar methanol solvent is required, which was used in a one-to-one volume ratio with liquid fuel (normal heptane). XRD, FTIR, FESEM, EDS, DRS, PL and BET tests were performed to characterize the photocatalyst. XRD results indicate the presence of anatase phase of titanium dioxide and FESEM shows catalytic nanoparticles in the shape of a sphere and their size is about 7.3 nm each. DRS results showed that the gap energy is equal to 57 / 2 electron volts, which indicates that its optical activity decreases relative to pure titanium dioxide. BET results prove that the specific surface area of the photocatalyst is 175.7 m2 / g
  9. Keywords:
  10. Liquid Fuels ; Platinum ; Titanium Dioxide ; Photocatalyst ; Desulfurizing ; Oxidative Desulfurization

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