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Synthesis, Characterization and Catalytic Application of rGO based Tin Oxide Nanocatalyst in Oxidative Desulfurization Process

Salmanzadeh Otaghsaraei, Sahar | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54131 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Hasannia, Saeed
  7. Abstract:
  8. In recent years, graphene-based materials have received much attention due to their prominent physicochemical properties such as high specific surface area, high mechanical strength and rich surface functional groups. In addition to these properties, low cost and environmental safety make graphene-based materials a green catalyst for many catalytic processes, including oxidative desulfurization. Tin oxide is a substance with strong acidic sites. Recent studies have shown that the oxidative desulfurization process using tin oxide nanoparticles is a new method for producing cleaner diesel fuels. In this study, rGO based tin oxide nanocatalyst was synthesized. To synthesize this catalyst, graphene oxide was first synthesized by Hammers method. Then, for the catalyst synthesis through the impregnation process, bivalent tin chloride salt enters the graphene oxide cavities and finally, after calcination at a temperature above 300° C, the graphene oxide particles are reduced, the tin ion is oxidized to tin oxide and tin oxide nanocatalysts were synthesized based on reduced graphene oxide. Batch reactor was used to the reactor test. Normal-heptane was used as a fuel model, dibenzothiophene as a sulfur model, and hydrogen peroxide as an oxidant for desulfurization. Then the effect of parameters such as reaction time, the amount of activated tin load on the reduced graphene oxide base and the initial concentration of sulfur in the model fuel on the performance of the desulfurization system were evaluated. Then, after determining the optimal conditions for the time, the amount of metal loading and the initial concentration of sulfur in the fuel, the effect of three effective parameters including reaction temperature, molar ratio of oxidant to sulfur and molar ratio of catalyst to sulfur on oxidative desulfurization using experimental design and The box-behnken method was investigated. Finally, using nanocatalyst with 15% tin metal loading, time 2 hours, initial sulfur concentration 700 ppm in 20cc normal heptane, molar ratio of oxidant to sulfur 10, temperature 60 ° C and molar ratio of catalyst to sulfur 0.11, the highest conversion rate of dibenzothiophene was obtained 93/43%
  9. Keywords:
  10. Reduced Graphene Oxide ; Tin Oxide ; Oxidative Desulfurization ; Experiments Design ; Nano Catalyst

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