ESR studies on hydrodesulfurization catalysts: nickel- or cobalt-promoted sulfided tungsten- or molybdenum-containing catalysts

Journal Article · Wed Dec 31 23:00:00 EST 1980 · J. Catal.; (United States)

DOI:https://doi.org/10.1002/chin.198118105· OSTI ID:6556005

Konings, A J.A.; Brentjens, W L.J.; Koningsberger, C D; De Beer, V H.J.

ESR spectra of nickel- or cobalt-promoted sulfided tungsten- or molybdenum-containing catalysts are measured together with the influence of equilibration at different H/sub 2/S/H/sub 2/ ratios and CO adsorption hereon. The ESR measurements are compared with thiophene hydrodesulfurization (HDS) activities. The influence of nickel and cobalt on the ESR spectra is essentially the same. This similarity also holds for the thiophene HDS activities. A new signal VI (g = 2.06, ..delta..H = 220 G for Ni-Mo; g = 2.08, ..delta..H = 220 G for Ni-W) not occurring in unpromoted catalysts is detected. The intensities of signals II, III, IV, and VI are dependent on the composition of the interacting atmosphere. Results are discussed in terms of WS/sub 2/(MoS/sub 2/) crystallite edge decoration with promotor ions. Possible surface configuration corresponding with the different paramagnetic sites are described.

• Research Organization: Univ. of Technology, Eindhoven, Netherlands
• OSTI ID: 6556005
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 67:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKENES
BUTENES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
DESULFURIZATION
ELECTRON SPIN RESONANCE
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGENATION
MAGNETIC RESONANCE
METALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NICKEL
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RESONANCE
SORPTION
SULFIDES
SULFUR COMPOUNDS
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN COMPOUNDS
TUNGSTEN SULFIDES