Investigation of the mechanism of the hydrodesulfurization of thiophene over sulfided Co-Mo/Al/sub 2/O/sub 3/ catalysts--2. The effect of promotion by cobalt on the C-S bond cleavage and double-bond hydrogenation/dehydrogenation activities of tetrahydrothiophene and related compounds
The C-S bond cleavage of 1.33 mm Hg of tetrahydrothiophene or 1-butanethiol with 22 mm Hg of hydrogen or helium present was studied at 521/sup 0/K on alumina-supported, presulfided, hydrogen-reduced catalysts containing approx. 11.5Vertical Bar3< molybdenum trioxide and 0, 3.93, and 4.93Vertical Bar3< cobalt oxide. The products from tetrahydrothiophene were 1-butene, 2-butenes, butane, and 1,3-butadiene, and their distribution resembled that previously reported for the desulfurization of thiophene. Butanethiol yielded higher proportions of butane, which suggested that no interconversion between these two sulfur compounds occurs. The results confirmed that desulfurization and hydrogenation proceed on different but related sites, and indicated that ring hydrogenation of thiophene occurs prior to C-S bond cleavage. A mechanism is proposed which involves the hydrogenation of thiophene to tetrahydrothiophene, dehydrosulfurization to 1,3-butadiene, and subsequent hydrogenation to butenes and butane. The scheme differs from mechanisms developed by other researchers and may be specific to the low pressures used in the experiments.
- Research Organization:
- University of Bradford
- OSTI ID:
- 6811136
- Journal Information:
- J. Catal.; (United States), Vol. 56:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
CATALYTIC EFFECTS
COBALT OXIDES
MOLYBDENUM OXIDES
THIOLS
DESULFURIZATION
HYDROGENATION
THIOPHENE
CATALYSTS
CHEMICAL ANALYSIS
CHEMICAL BONDS
CLEAVAGE
COBALT
PROMOTERS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
CRYSTAL STRUCTURE
ELEMENTS
HETEROCYCLIC COMPOUNDS
METALS
MICROSTRUCTURE
MOLYBDENUM COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)