Role of nickel in the activity of unsupported Ni-Mo hydrodesulfurization catalysts
A series of unsupported nickel-molybdenum sulfide catalysts covering the range 0 to 100 atom % nickel has been prepared by continuous coprecipitation. The catalyst containing 55 atom % nickel showed the highest specific activity for thiophene hydrodesulfurization. Chemical and structural analyses of the catalysts appear consistent with the suggestion that the hydrodesulfurization sites are coordinatively unsaturated Mo/sup 3 +/ cations at anion vacancies on the edges of the MoS/sub 2/ flakes, while edge-intercalated nickel serves as an olefin hydrogenation site, and reducing Mo/sup 4 +/ to Mo/sup 3 +/, in accordance with the structural model of Cossee and Farragher. Highly dispersed Ni/sub 3/S/sub 2/ is suggested to play a role in hydrogen activation, transferring protons and electrons to the MoS/sub 2/, and this may form the origin of the synergistic mechanism. The likely roles of the promoter are summarized.
- Research Organization:
- Univ. of Melbourne, Parkville, Australia
- OSTI ID:
- 6540733
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 66:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DATA
DESULFURIZATION
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROGENATION
INFORMATION
METALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
STRUCTURAL CHEMICAL ANALYSIS
SULFIDES
SULFUR COMPOUNDS
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS