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Fabrication and Evaluation of Nanostructured Photocatalysts Using Metal-Organic Frameworks for Photocatalytic Oxidative Desulfurization of Liquid Fuel

Beshtar, Mehdi | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55883 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad; Ghotbi, Cirous; Larimi, Afsaneh; Asgharinejad, Ali Akbar
  7. Abstract:
  8. Ti-UIO-66(Zr) nanocomposites have been prepared via a modified one-step solvothermal methodology and evaluated in photocatalytic oxidative desulfurization. Extensive characterization by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDX), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS), photoluminescence spectroscopy (PL), nitrogen adsorption-desorption, and thermogravimetric analysis (TGA), have revealed the role of Ti loading, on Ti speciation and the structure of the composite materials. Their performance have been evaluated for photocatalytic oxidative desulfurization (PODS). PODS reaction parameters, including temperature, photocatalyst dosage, oxygen to sulfur ratio, and solvent to fuel ratio, were optimized, with dibenzothiophene (DBT) conversion reaching 100% under optimal conditions (T=50℃, photocatalyst dosage=2 g/L, O/S=8, and solvent/fuel=1). Recyclability studies performed for the optimal catalyst showed good stability over six recycles, with total conversion dropping by only 18%. Kinetic studies showed that DBT PODS follows pseudo-first-order kinetics, with an activation energy value of 55.1 kJ.mol-1
  9. Keywords:
  10. Titanium ; Oxidative Desulfurization ; Photodegradation ; Photocatalyst ; UiO-66 Hybrid Nanoparticles ; Metal-Organic Framework ; Liquid Fuels ; First-Order Reaction

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