Tetrahydrothiophene desulfurization on Co-Mo/. gamma. -Al sub 2 O sub 3 : A temporal analysis of products (TAP) investigation
- Worcester Polytechnic Institute, MA (USA)
- Monsanto Chemical Co., St. Louis, MO (USA)
The catalytic reactions of tetrahydrothiophene, thiophene, 1-butene, 1,3-butadiene, and n-butane with hydrogen were studied at low pressure over a commercial cobalt molybdate catalyst. The formation sequence of tetrahydrothiophene desulfurization products was monitored with submilli-second time resolution using the temporal analysis of products (TAP) transient microreactor technique. The TAP experiments showed that butene and were the only hydrocarbon desulfurization products formed, although rapid dehydrogenation to thiophene was also observed. The exceptional time resolution of the TAP spectrometer provided evidence that the butene formed could not be accounted for by a mechanism involving butadiene hydrogenation. The results suggested a desulfurization mechanism for tetrahydrothiophene wherein C{sub 4} hydrocarbon formation proceeds via a surface butene thiolate intermediate produced by a single {beta}-hydride elimination of the intermediate, while rapid C-S bond hydrogenolysis involving surface hydrogen is responsible for butene formation.
- OSTI ID:
- 5598506
- Journal Information:
- Journal of Catalysis; (USA), Vol. 127:1; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
COBALT COMPOUNDS
CATALYTIC EFFECTS
POLYCYCLIC SULFUR HETEROCYCLES
DESULFURIZATION
ALUMINIUM OXIDES
BUTADIENE
BUTENES
CATALYST SUPPORTS
CHEMICAL REACTION KINETICS
DEHYDROGENATION
HYDROGENATION
MOLYBDATES
REACTION INTERMEDIATES
SPECTROMETERS
THIOPHENE
ALKENES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DIENES
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
KINETICS
MEASURING INSTRUMENTS
MOLYBDENUM COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYENES
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
020400* - Petroleum- Processing
010402 - Coal
Lignite
& Peat- Purification & Upgrading