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

Journal Article · Wed Mar 14 23:00:00 EST 1979 · J. Catal.; (United States)

OSTI ID:6811136

Hargreaves, A E; Ross, J R.H.

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), Journal Name: J. Catal.; (United States) Vol. 56:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical &amp; Physicochemical Properties-- (-1987)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL BONDS
CHEMICAL REACTIONS
CLEAVAGE
COBALT
COBALT COMPOUNDS
COBALT OXIDES
CRYSTAL STRUCTURE
DESULFURIZATION
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROGENATION
METALS
MICROSTRUCTURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROMOTERS
THIOLS
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS