Ultra deep hydrodesulfurization of dibenzothiophene derivatives over NiMo/TiO2-Al2O3 catalysts

Youssef Saih, M. Nagata, T. Funamoto, Y. Masuyama, K. Segawa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

We have investigated the catalytic activity of NiMo sulfide catalysts supported on TiO2-coated Al2O3 carriers during the HDS of dibenzothiophene, 4-methyldibenzothiophene and 4,6- dimethyldibenzothiophene at 603 K and 3 MPa. TiO2-Al 2O3 supports were prepared by chemical vapor deposition of TiCl4 on the surface of γ-Al2O3 (240 m2 g-1, 0.84 cm3 g-1). Using XPS, we showed that TiO2 is highly dispersed on the surface of Al 2O3 for TiO2 loadings up to ca. 14 wt%. Moreover, TiO2-Al2O3 (14 wt% TiO2) support showed textural properties very similar to those of the parent alumina support. The composite support with TiO2 loading around 14 wt% was used as support for NiMo sulfide catalysts. The sulfidation degree of Mo, as determined by XPS, was higher for NiMo/TiO2-Al2O 3 than for NiMo/Al2O3. This can be attributed to the lower interaction of molybdenum species with the TiO2-Al 2O3 composite support. The hydrodesulfurization (HDS) tests conducted here showed that NiMo/TiO2-Al2O 3 catalysts are more active than NiMo/Al2O3 ones for the HDS of dibenzothiophene, 4-methyldibenzothiophene and 4,6-dimethyldibenzothiophene. Comparison of product selectivity of cyclohexylbiphenyl (CHB)/biphenyl (BP) values showed that NiMo/TiO 2-Al2O3 catalysts exhibit higher hydrogenation activity than NiMo/Al2O3.

Original languageEnglish (US)
Pages (from-to)11-22
Number of pages12
JournalApplied Catalysis A: General
Volume295
Issue number1
DOIs
StatePublished - Oct 13 2005

Keywords

  • Dibenzothiophene derivatives
  • Hydrodesulfurization
  • TiO-AlO composite
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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