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Hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene: Effect of an acid component on the activity of a sulfided NiMo on alumina catalyst

Authors
Journal
Applied Catalysis A General
0926-860X
Publisher
Elsevier
Publication Date
Volume
169
Issue
2
Identifiers
DOI: 10.1016/s0926-860x(98)00021-0
Keywords
  • Hydrodesulfurization
  • Dibenzothiophene
  • 4
  • 6-Dimethyldibenzothiophene
  • Nickel-Molybdenum Sulfides
  • Silica–Alumina
  • Y Zeolite
  • Bifunctional Catalysts

Abstract

Abstract The transformation of dibenzothiophene and 4,6-dimethyldibenzothiophene was carried out in a flow reactor at 340°C under a 3.0 MPa hydrogen pressure. A sulfided NiMo on alumina was used as reference catalyst. The effect of the acidity was studied by mixing this catalyst with silica–alumina, or by using a bifunctional NiMo-Y zeolite catalyst. On the sulfided NiMo on alumina catalyst, dibenzothiophene transformed mainly through direct desulfurization, yielding biphenyl. This reaction was much slower in the case of 4,6-dimethyldibenzothiophene, which renders the molecule less reactive. The addition of an acidic function to the sulfide catalyst did not modify the reactivity of dibenzothiophene while it strongly increased that of 4,6-dimethyldibenzothiophene. This is attributed to the isomerization of 4,6-dimethyldibenzothiophene into 3,6-dimethyldibenzothiophene, which is more reactive than 4,6-dimethyldibenzothiophene. In the presence of an acidic component, cracking of the desulfurized molecules can also be observed.

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