Hydrodesulfurization of thiophenic compounds: the reaction mechanism
It has often been assumed that catalytic hydrodesulfurization of thiophene and related compounds proceeds via a one-point end-on adsorption involving bonding of the sulfur atom with Mo ions at an anion vacancy on the catalyst surface. This interpretation is inadequate, failing to account for hydrogen-deuterium exchange results, the reactivities of benzothiophene and dibenzothiophene, and the small steric effects of methyl substituents on the adsorption and reaction of compounds in the thiophene, benzothiopene, and dibenzothiophene families of homologs. An alternative mechanism, presented here, involves a multipoint adsorption of the reactant, with a C=C bond interacting with a Mo cation, and the S atom of the reactant interacting with an S ion on the surface. The new mechanism accounts for the observed deuterium exchange and hydrodesulfurization reactions and is consistent with the observed steric effects. 24 references, 5 figures.
- Research Organization:
- Univ. of Delaware, Newark
- OSTI ID:
- 5378538
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 61:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COBALT
DESULFURIZATION
DEUTERIUM
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LABELLING
LIGHT NUCLEI
MECHANICAL STRUCTURES
METALS
MOLYBDENUM
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFRACTORY METALS
STABLE ISOTOPES
SULFUR
SUPPORTS
TRANSITION ELEMENTS