Hydrocracking of vacuum residue using NiWS(x) dispersed catalysts

Young Gul Hur, Dae Won Lee, Kwan Young Lee

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


In this study, unsupported nickel-tungsten sulfide (NiWS(x)) particles, where x is the actual molar ratio of Ni/W (x = 0, 0.005, 0.01, 0.02), were prepared, characterized with XRD, XPS, TEM, and EDX elemental mapping, and applied as a dispersed catalyst for upgrading of extra-heavy oil into good-quality liquid products. The hydrocracking reaction of vacuum residue (VR) was carried out at 400 °C with an initial H2 pressure of 70 bar. It was found that an increase in the Ni content increases the degree of sulfidation of tungsten, promotes formation of Ni-W-S phases, and enhances the overall catalytic activity. Among the NiWS(x) dispersed catalysts, the NiWS(0.02) catalyst showed the highest performance in total liquid product yield (87.0 wt.%), commercial fuel fraction yield (51.9 wt.%), API gravity value of liquid product (14.3°), and sulfur removal conversion (86.5%). In addition, coke formation (4.0 wt.%) was efficiently suppressed, and the C5-asphaltene conversion (81.8%) was significantly raised.

Original languageEnglish
Pages (from-to)794-803
Number of pages10
Publication statusPublished - 2016 Dec 1


  • Dispersed catalyst
  • Hydrocracking
  • Hydrotreating
  • Ni-W-S catalyst
  • Vacuum residue

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry


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