Influence of nitrogen compounds on deep hydrodesulfurization of 4,6-dimethyldibenzothiophene over Al2O3- and MCM-41-supported Co-Mo sulfide catalysts

Uday T. Turaga, Xiaoliang Ma, Chunshan Song

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

The present work focuses on the effect of nitrogen compounds on the activity of MCM-41- and γ-Al2O3-supported Co-Mo catalysts for the deep hydrodesulfurization of 4,6-dimethyldibenzothiophene (4,6-DMDBT) in a fixed-bed flow reactor. Sulfur removal to the depths required by new specifications will require knowledge of the influence of non-sulfur diesel fuel components on deep hydrodesulfurization. The main objective of this paper is to examine the activity of hydrodesulfurization catalysts during and, most importantly, after exposure to basic and non-basic nitrogen. Quinoline (basic nitrogen) inhibits catalytic activity of both γ-Al 2O3- and MCM-41-supported catalysts. It strongly inhibits hydrogenation and hydrogenolysis activity as evidenced by decreased selectivity for cyclohexylbenzene and biphenyl derivatives, respectively. To a certain extent, the long-term effects of quinoline are reversible. Carbazole (non-basic nitrogen) has little effect on the γ-Al2O 3-supported Co-Mo catalyst but significantly inhibits the activity of the MCM-41-supported Co-Mo catalyst. The inhibition of the MCM-41-supported catalyst is reversible following removal of carbazole from the feedstock. Molecular modeling was also conducted to derive the bond order and electron charges of the nitrogen and sulfur compounds, which are helpful to understanding the experimental results.

Original languageEnglish (US)
Pages (from-to)265-275
Number of pages11
JournalCatalysis Today
Volume86
Issue number1-4
DOIs
StatePublished - Nov 1 2003

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Nitrogen Compounds
Nitrogen compounds
Hydrodesulfurization
Multicarrier modulation
Sulfides
Catalysts
Nitrogen
Catalyst supports
Catalyst activity
Sulfur Compounds
Hydrogenolysis
Molecular modeling
Sulfur compounds
Desulfurization
Diesel fuels
Feedstocks
Hydrogenation
Derivatives
Specifications
4,6-dimethyldibenzothiophene

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

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Influence of nitrogen compounds on deep hydrodesulfurization of 4,6-dimethyldibenzothiophene over Al2O3- and MCM-41-supported Co-Mo sulfide catalysts. / Turaga, Uday T.; Ma, Xiaoliang; Song, Chunshan.

In: Catalysis Today, Vol. 86, No. 1-4, 01.11.2003, p. 265-275.

Research output: Contribution to journalArticle

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