Abstract

The high-energy potential of wastewater sewage sludge (SS) produced in large amounts around the world makes it an attractive feedstock for fuels and energy sectors. Thermochemical valorization relying on pyrolysis of SS followed by hydrotreatment of pyrolysis oil (Py-SS) might even allow the integration of SS into existing oil refineries. In the present study, catalytic hydrotreatment of Py-SS was performed over a NiCuMo-P-SiO2 catalyst in a batch reactor at temperatures in the range of 200–390C. Due to sulfur presence in the feed, the increasing reaction temperature induced in situ transformation of metallic Ni into Ni3S2 in the catalyst. In contrast, the Ni3P active phase possessed remarkable stability even at the harshest reaction conditions. The oxygen content in the reaction products was decreased by 59%, while up to 52% of N and 89% of S were removed at 390C. The content of free fatty acids was greatly reduced by their conversion to n-alkanes, while the larger amount of volatile aromatics was generated from high molecular mass compounds. The quality of oil-derived products greatly changed at elevated temperatures, providing strong evidence of effective upgrading via decarboxy(ny)lation, hydrogenation, and hydrocracking transformations.

Original languageEnglish
Article number1273
Pages (from-to)1-27
Number of pages27
JournalCatalysts
Volume10
Issue number11
DOIs
Publication statusPublished - Nov 2020

Keywords

  • Hydrotreatment
  • Nickel-phosphide catalyst
  • Pyrolysis oil
  • Sewage sludge
  • CRUDE BIO-OIL
  • ENERGY
  • MOLYBDENUM
  • HYDROTHERMAL LIQUEFACTION
  • sewage sludge
  • SOL-GEL CATALYSTS
  • WASTE
  • BIOMASS
  • GASIFICATION
  • pyrolysis oil
  • XPS
  • OXIDES
  • hydrotreatment
  • nickel-phosphide catalyst

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