Catalytic hydrodesulfurization of dibenzothiophene through partial oxidation and a water-gas shift reaction in supercritical water

Tadafumi Adschiri, Ryuji Shibata, Takafumi Sato, Masaru Watanabe, Kunio Arai

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113 Citations (Scopus)

Abstract

We conducted a comparative study of catalytic hydrodesulfurization of dibenzothiophene (DBT) with NiMo/Al2O3 at 673 K and 30 MPa, in various atmospheres (H2-SCW, CO-SCW, CO2-H2-SCW, and HCOOH-SCW), using a tube bomb reactor. Higher conversion of DBT was obtained in CO-SCW, CO2-H2-SCW, and HCOOH-SCW than in H2-SCW. These results clearly indicate that a water-gas shift reaction in supercritical water (SCW) produces species which can hydrogenate DBT more effectively than H2 gas. We also conducted another experiment for the partial oxidation of a DBT-hexylbenzene mixture in SCW. Even in the presence of oxygen, effective hydrogenation of DBT took place. This result is probably because CO forms through the partial oxidation of hexylbenzene and converts to the hydrogenating species through a water-gas shift reaction. We think the catalytic desulfurization of heavy oils in SCW will be a promising new technology, since even by introducing oxygen or air instead of hydrogen, an excellent hydrogenating atmosphere can be supplied.

Original languageEnglish
Pages (from-to)2634-2638
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume37
Issue number7
DOIs
Publication statusPublished - 1998 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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