Facile ultra-deep desulfurization of gas oil through two-stage or -layer catalyst bed

Ki Hyouk Choi, Naoyuki Kunisada, Yozo Korai, Isao Mochida, Koji Nakano

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)


Ultra-deep hydrodesulfurization (HDS) was attempted to achieve the sulfur level less than 15ppmS by staged and layered catalyst beds over commercially available catalysts. It was confirmed that two-stage and two-layer reaction schemes can attain the targeted sulfur level. Two-stage reaction with hydrogen refreshment between stages could provide the sulfur content lower than 15ppmS over most of the catalysts examined in the present study where the first stage desulfurized the feed oil to be of 300-400 ppm S. Two-layer reaction, where two layers were connected directly without gas renewal, suffered severe inhibition of H2S and NH3. Nevertheless, NiMo sulfides on alumina support with sufficient acidity or zeolite achieved the sulfur level lower than 15ppmS by two-layer scheme. Nitrogen species survived in the first layer reaction were found to strongly affect the extent of desulfurization in the subsequent second layer reaction.

Original languageEnglish
Pages (from-to)277-286
Number of pages10
JournalCatalysis Today
Issue number1-4
Publication statusPublished - Nov 1 2003

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry


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