Promoting effect in sulfided Ni-Mo/Al/sub 2/O/sub 3/ catalysts as studied by chemisorption

Journal Article · Fri Jun 01 04:00:00 EDT 1984 · J. Catal.; (United States)

OSTI ID:6139875

Bachelier, J; Duchet, J C; Cornet, D

Two series of thiophene-sulfided Ni-Mo/Al/sub 2/O/sub 3/ catalysts, with constant molybdenum content (7 and 16 wt% MoO/sub 3/, respectively) and variable nickel concentration have been characterized by their thiophene hydrodesulfurization activities and their chemisorption capacities measured in situ. Carbon monoxide adsorption was performed at 0/sup 0/C and oxygen uptake at 60/sup 0/C. Both adsorbate molecules exhibit similar behavior in the series and are thought to be good probes for anion vacancies. For the first series of catalysts, the characterizations distinguish three concentration ranges according to the Ni/Mo ratio. The main enhancement of activity is observed in the range 0.2 < Ni/Mo < 0.6 with a simultaneous slight increase in gas consumption. Comparison of the data with similar characterizations of Ni/Al/sub 2/O catalysts indicates that the promoting effect is not associated with an excess of anion vacancies. The whole set of samples leads to three different kinds of correlations between activity and chemisorption, thus revealing different actions of nickel ions on the molybdenum-based catalyst. For the second series, chemisorption results are not clearly influenced by the Ni content. 24 references, 3 figures, 1 table.

• Research Organization: Universite de Caen, France
• OSTI ID: 6139875
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 87:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
DATA
DESULFURIZATION
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROGENATION
INFORMATION
IONS
KINETICS
LOW TEMPERATURE
MEDIUM TEMPERATURE
METALS
MOLYBDENUM
NICKEL
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLYCYCLIC SULFUR HETEROCYCLES
PROBES
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
THERMODYNAMIC ACTIVITY
TRANSITION ELEMENTS