Role of group VIII metal promoter in MoS/sub 2/ and WS/sub 2/ hydrotreating catalysts. II. Catalytic and physicochemical properties of nickel-promoted catalysts

Journal Article · Fri Feb 01 04:00:00 EST 1985 · J. Catal.; (United States)

OSTI ID:5312938

Thakur, D S; Grange, P; Delmon, B

The promotional effects of nickel on the catalytic activities of MoS/sub 2/ and WS/sub 2/ have been investigated. A series of unsupported Ni-W sulfides with a composition ratio, r = Ni/(Ni + W) (atom), varying from 0.0 to 1.0, and two unsupported and fully sulfide nickel-molybdenum catalysts (one prepared by comaceration method and the other by homogeneous sulfide precipitation method) with r = 0.25 have been tested for cyclohexane isomerization, cyclohexene hydrogenation, and thiophene hydrogenolysis of 305/sup 0/C and 30 bars of hydrogen pressure. Surface area, X-ray diffraction, and ESR measurements on Ni-W samples show that in the low composition range, r < 0.05, the surface area decrease is associated with the formation of large crystallites. The ESR study shows the presence of W(V), W(III), and sulfur-containing paramagnetic species in the sample with r = 0.00. At the synergetic composition range, r = 0.15 to 0.40, the surface area versus composition plots shows a wide maximum, while the ESR results indicate the presence of certain ferromagnetic nickel-containing phase. It is shows that a strong electronic interaction takes place between two sulfide phases. 54 refs., 8 figs., 2 tabs.

• Research Organization: Univ. Catholique de Louvain, Belgium
• OSTI ID: 5312938
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 91:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
ACTIVATION ENERGY
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTRON SPIN RESONANCE
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FERROMAGNETIC MATERIALS
HYDROGENATION
INFORMATION
MAGNETIC MATERIALS
MAGNETIC RESONANCE
MATERIALS
METALS
MOLYBDENUM
NICKEL
NUMERICAL DATA
PROMOTERS
RESONANCE
SCATTERING
SULFIDES
SULFUR COMPOUNDS
SYNERGISM
TRANSITION ELEMENTS
TUNGSTEN
X-RAY DIFFRACTION