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Oxidative Desulfurization of Dibenzothiophene Using M/TiO2/MWW (M = Cu, Ag, and Au) Composite

  • CHEMICAL KINETICS AND CATALYSIS
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Abstract

Zeolite MWW was synthesized by microwave and hydrothermal method, and used as the support on which M/TiO2 (M = Cu, Ag, and Au) was loaded via wet impregnation method. Dibenzothiophene (DBT) removal in mild conditions was studied on various catalysts: MWW, Cu/TiO2/MWW, Ag/TiO2/MWW, and Au/TiO2/MWW. Among the synthesized composites, Au/TiO2/MWW, Ag/TiO2/MWW, and Cu/TiO2/MWW had better performance. Also, the results indicated that Au/TiO2/MWW considerably outperformed MWW. Response surface methodology (RSM) with central composite design (CCD) was used to study the effects of Au/TiO2/MWW composite loading, H2O2 volume, and temperature. Finally, the optimal conditions providing the highest conversion of sulfur (99.99%) were determined as 0.24 g Au/TiO2/MWW, 0.26 mL H2O2 and temperature of 59.4°C. Based on the results, Au/TiO2/MWW composite was shown to be an efficient catalyst for oxidation of sulfur heterocycles. The results of kinetic study indicated that pseudo first-order model has a good agreement with the experimental data. The desulfurization of gas condensate was studied under optimal conditions. The desulfurization efficiency over Au/TiO2/MWW catalyst was 89.11%.

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Authors and Affiliations

  1. Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Narges Elmi Fard

  2. Department of Chemical Engineering, Faculty of Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran

    Reza Fazaeli

  3. Department of Chemistry, Yadegar-e-Imam Khomeini (RAH) Shahr-e-Rey Branch, Islamic Azadmehr University, Tehran, Iran

    Mohammad Yousefi

  4. Department of Chemistry, East Tehran Branch, Islamic Azad University, Tehran, Iran

    Shahrzad Abdolmohammadi

Authors
  1. Narges Elmi Fard
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  2. Reza Fazaeli
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  3. Mohammad Yousefi
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  4. Shahrzad Abdolmohammadi
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Correspondence to Narges Elmi Fard or Reza Fazaeli.

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Fard, N.E., Fazaeli, R., Yousefi, M. et al. Oxidative Desulfurization of Dibenzothiophene Using M/TiO2/MWW (M = Cu, Ag, and Au) Composite. Russ. J. Phys. Chem. 95 (Suppl 1), S23–S32 (2021). https://doi.org/10.1134/S0036024421140065

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  • DOI: https://doi.org/10.1134/S0036024421140065

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