High activity catalyst from exfoliated MoS/sub 2/

Journal Article · Sun Feb 01 00:00:00 EST 1987 · J. Catal.; (United States)

OSTI ID:5665577

Miremadi, B K; Morrison, S R

By using exfoliated MoS/sub 2/ suspended as single layers in solution the authors have been able to prepare what appear to be unusually high activity catalysts, where hydrogenation of CO, methanation, was used as the model reaction. The process depends on three features in the preparation; first, the preparation of the single molecular layer MoS/sub 2/; second, the deposition of these as single layers onto high-surface-area Al/sub 2/O/sub 3/ (or rather deposition of Al/sub 2/O/sub 3/ onto single layers of MoS/sub 2/); and third, the deposition of monolayers of nickel onto the single layers of MoS/sub 2/. With this structure, suitably calcined and reduced to improve the interaction between the Mo, the Ni, and the Al/sub 2/O/sub 3/, the authors have a very high density of active sites per unit area (and per unit mass). The most active sites appear to be a form of oxysulfide. The active sites when nickel is present behave differently from Ni supported on Al/sub 2/O/sub 3/. The Ni/Mo/Al/sub 2/O/sub 3/ composition yields CO/sub 2/ as the by-product of methanation, instead of the H/sub 2/O observed with the Ni/Al/sub 2/O/sub 3/ composition, and has a different activation energy. A specific formulation designed to give the maximum density of accessible Ni/Mo/Al/sub 2/O/sub 3/ sites shows an activity substantially higher than Ni/Al/sub 2/O/sub 3/. For formulation without Ni the activity of catalysts prepared by exfoliation shows substantially higher activity than those prepared by precipitation from ammonium heptamolybdate.

• Research Organization: Simon Fraser Univ., Burnaby, British Columbia
• OSTI ID: 5665577
• Journal Information: J. Catal.; (United States), Vol. 103:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON MONOXIDE
METHANATION
CATALYSTS
CHEMICAL PREPARATION
MOLYBDENUM SULFIDES
CATALYTIC EFFECTS
NICKEL
ACTIVATION ENERGY
ALUMINIUM OXIDES
CALCINATION
CARBON DIOXIDE
CATALYST SUPPORTS
COMPARATIVE EVALUATIONS
DEPOSITION
HYDROGENATION
LAYERS
OXYSULFIDES
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
ENERGY
METALS
MOLYBDENUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
REFRACTORY METAL COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)