X-ray photoelectron spectroscopy study of cobalt-molybdenum binary oxide catalysts

Journal Article · Fri Mar 30 04:00:00 EST 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(79)90053-8· OSTI ID:7128261

Okamoto, Y; Shimokawa, T; Imanaka, T; Teranishi, S

Cobalt-molybdenum catalysts prepared from their mixed salt solutions and calcined at 550 showed surface enrichment of cobalt at Co 6 and surface enrichment of molybdenum for higher cobalt contents. Catalysts prepared by mixing, and calcining at 550/sup 0/C, the dry oxide powders showed no differences between bulk and surface composition. Further studies with a catalyst prepared by the dry mixing method and containing 30Vertical Bar3< cobalt showed that treating the calcined catalyst with 10 mm Hg thiophene/hydrogen or pure hydrogen at 400/sup 0/C enriched the surface with molybdenum which was in the form of molybdenum disulfide (MoS/sub 2/) after the thiophene treatment. Treatment with hydrogen sulfide/hydrogen under the same conditions enriched the surface with cobalt as CoS and/or Co/sub 9/S/sub 8/. Zinc-molybdenum catalysts behaved similarly.

• Research Organization: Osaka Univ.
• OSTI ID: 7128261
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 57:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
CALCINATION
CATALYSTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT OXIDES
COMPARATIVE EVALUATIONS
DECOMPOSITION
HIGH TEMPERATURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
SPECTROSCOPY
SULFIDATION
SURFACE PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS