Autocatalysis-like behavior of hydrogen sulfide on hydrodesulfurization of polyaromatic thiophenes over a synthesized molybdenum sulfide catalyst

Hamdy Farag, Kinya Sakanishi, Takenaka Sakae, Masahiro Kishida

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene over a synthesized nanosize-MoS2 catalyst were investigated in a batch reactor. The catalytic activity in hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene increased remarkably with H2S being remained in the reaction zone. The HDS reactions of the two substrates over the present catalyst were found to proceed via a network where direct desulfurization and hydrogenation routes are essentially involved. The product contribution from the hydrogenation route is much more pronounced. Isomerized components were also identified. Dibenzothiophene and 4,6-dimethyldibenzothiophene exhibited almost identical results in terms of the reactivity and selectivity. The increase in the catalytic activity with H2S is probably due to the increase in the number of the potentially active sites modified by H2S. The kinetic investigation of the hydrodesulfurization reactions revealed the autocatalysis-like phenomena attributed to the potentially modified active sites by self-produced H2S. TEM image reveals that the synthesized MoS2 may consist of a bent and/or a closed round layers which might play an important role in such autocatalysis behaviors of H2S in the hydrodesulfurization of polyaromatic thiophenes.

Original languageEnglish
Pages (from-to)114-122
Number of pages9
JournalApplied Catalysis A: General
Volume314
Issue number1
DOIs
Publication statusPublished - Oct 25 2006

Fingerprint

Thiophenes
Hydrogen Sulfide
Hydrodesulfurization
Hydrogen sulfide
Thiophene
Molybdenum
Catalysts
Hydrogenation
Catalyst activity
Catalyst selectivity
Batch reactors
Desulfurization
Transmission electron microscopy
Kinetics
Sulfides
molybdenum disulfide
Substrates
dibenzothiophene
4,6-dimethyldibenzothiophene

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

Autocatalysis-like behavior of hydrogen sulfide on hydrodesulfurization of polyaromatic thiophenes over a synthesized molybdenum sulfide catalyst. / Farag, Hamdy; Sakanishi, Kinya; Sakae, Takenaka; Kishida, Masahiro.

In: Applied Catalysis A: General, Vol. 314, No. 1, 25.10.2006, p. 114-122.

Research output: Contribution to journalArticle

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