Hydrosulfurization of methyl-substituted dibenzothiophenes: Fundamnetal study of routes to deep desulfurization
- Ben-Gurion Univ. of the Negec, Beer-Sheva (Israel)
Four catalysts, Co-Mo and Ni-Mo, designed to cover a wide range of activity for aromatic ring hydrogenation and two catalysts, zeolite-Co-Mo, with different cracking activities were tested, in the hydrodesulfurization of dibenzothiophene (DBT) and 4,6-dimethyl-DBT (DMDBT) in a fixed-bed reactor at 360{degrees}C and a hydrogen pressure of 5.4 MPa. Increasing the hydrogenation activity of the catalysts increased the mole ratio, {alpha}, of cyclohexylbenzenes to biphenyls produced from both reactants. Although a had little effect on the hydrodesulfurization (HDS) rate of DBT, the HDS rate of DMDBT increased significantly with {alpha}, approaching the same level as for DBT at {alpha}=2. Introduction of zeolite H-ZSM-5 to the CO-Mo-Al catalyst increased the HDS rate of DBT at a lower value of {alpha} and decreased that of DMDBT. No cracking reactions of DBT and DMDBT were detected. A Co-Mo-Al catalyst containing HY zeolite displayed significant cracking activity of DMDBT defined by two routes: demethylation of benzenic rings and scission of the C-C bond connecting the benzenic rings. It resulted in increasing HDS rates of DMDBT by about threefold relative to the Co-Mo-Al catalyst, yielding toluene and benzene, at a ratio of about 3, as the main HDS products. About 80% of the DMDBT desulfurized with HY-Co-Mo-Al catalyst was converted through {open_quotes}cracking{close_quotes} intermediates, 90% of those intermediates being produced through the scission of the C-C bond connecting the benzenic rings. 32 refs., 9 figs., 3 tabs.
- OSTI ID:
- 263790
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 159; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Deep desulfurization of light oil. 3. Effects of solvents on hydrodesulfurization of dibenzothiophene
Hydrodesulfurization of sulfur heterocyclic compounds: kinetics of dibenzothiophene. [Hydrodesulfurization of dibenzothiophene]
Mechanism of hydrodesulfurization of dibenzothiophene: a kinetic analysis
Journal Article
·
Wed Mar 31 23:00:00 EST 1993
· Industrial and Engineering Chemistry Research; (United States)
·
OSTI ID:6535070
Hydrodesulfurization of sulfur heterocyclic compounds: kinetics of dibenzothiophene. [Hydrodesulfurization of dibenzothiophene]
Journal Article
·
Sat Jan 31 23:00:00 EST 1981
· J. Catal.; (United States)
·
OSTI ID:6395247
Mechanism of hydrodesulfurization of dibenzothiophene: a kinetic analysis
Conference
·
Tue Jan 31 23:00:00 EST 1978
· Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States)
·
OSTI ID:6870325