Influence of nitrogen on deep hydrodesulfurization of 4,6-dimethyldibenzothiophene

Uday T. Turaga, Gang Wang, Xiaoliang Ma, Chunshan Song, Harold H. Schobert

Research output: Contribution to journalConference articlepeer-review

12 Scopus citations


Several researchers have clearly established the inhibiting effect of basic nitrogen compounds on the HDS of thiophene and dibenzothiophene. At very low sulfur levels, refractory nitrogen compounds could sinificantly influence the deep HDS of polyaromatic sulfur compounds (PASC). The effect of two nitrogen compounds, one basic and the other non-basic, on the deep HDS of the most refractory PASC 4,6-dimethyldibenzothiophene (4,6-DMDBT) was presented. Quinoline severely inhibited the activity of the catalyst for the HDS of 4,6-DMDBT especially when co-existing with the model sulfur compound. Different from quinoline, net charge on N in carbazole was similar to net charge on S atom in 4,6-DMDBT. The bond order in carbazole was more uniform and less than that in quinoline. The catalyst did not regain its original activity following removal of quinoline from the feedstock. No such effects were observed with the addition of carbazole to the HDS feed.

Original languageEnglish (US)
Pages (from-to)89-92
Number of pages4
JournalACS Division of Petroleum Chemistry, Inc. Preprints
Issue number1
StatePublished - Feb 1 2002
EventACS National Meeting - Orlando, FL, United States
Duration: Apr 7 2002Apr 11 2002

All Science Journal Classification (ASJC) codes

  • Fuel Technology


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