Deoxygenation of esters over sulfur-free Ni–W/Al2O3 catalysts for production of biofuel components

R. G. Kukushkin, P. M. Yeletsky, C. T. Grassin, B. H. Chen, O. A. Bulavchenko, A. A. Saraev, V. A. Yakovlev

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Sulfur-free Ni–W/Al2O3 catalysts synthesized through incipient wetness impregnation technique were investigated in deoxygenation of methyl palmitate and ethyl caprate blend at 300 °C and P = 1 MPa (PH2 = 0.25 MPa) in a fixed-bed continuous flow reactor. Modification of Ni/Al2O3 catalysts by W (0.4–4.4 wt%) was found to give rise to higher both conversions of the feedstock and deoxygenation degree. In addition, this also resulted in a change in the selectivity of deoxygenation towards alkanes formed via direct hydrodeoxygenation route, compared to alkanes formed through decarboxylation/decarbonylation. Selectivity by alkanes with carbon chain length equal to those of an initial fatty acid formed via hydrodeoxygenation was found to increase with W content increasing. The synthesized catalysts were investigated by XRD, XPS, TEM, BET and H2-TPR techniques. According to XPS study of the reduced samples, tungsten was in 6+ oxidation state on the sample surface and W6+ content increased in the near-surface layer of samples with tungsten content increasing in catalysts.

Original languageEnglish
Article number125202
Number of pages8
JournalChemical Engineering Journal
Volume396
DOIs
Publication statusPublished - 15 Sep 2020

Keywords

  • Deoxygenation
  • Green diesel
  • Nickel
  • Tungsten
  • Vegetable oil
  • GREEN DIESEL
  • HYDROGENATION
  • OXIDE
  • ACID
  • RAY PHOTOEMISSION-SPECTROSCOPY
  • NATURAL TRIGLYCERIDES
  • VEGETABLE-OILS
  • NICKEL
  • HYDRODEOXYGENATION
  • REDUCTION

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