The role of Co in unsupported Co-Mo sulfides in the hydrodesulfurization of thiophene

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1168· OSTI ID:7027910

Inamura, K; Prins, R ^[1]

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1. Laboratorium fuer Technische Chemie, Zuerich (Switzerland)

Unsupported Co-Mo catalysts were prepared by impregnation of MoS[sub 2], obtained by thermal decomposition of ammonium tetra-thiomolybdate, with a solution of cobalt nitrate in acetone. XRD and HREM showed that the MoS[sub 2] structure of the resulting catalysts remained intact upon addition of Co. The thiophene hydrodesulfurization and the consecutive butene hydrogenation properties indicated that the Co ions are preferentially situated at the edges of the MoS[sub 2] crystallites below Co/(Co + Mo) = 0.08 and promote the hydrodesulfurization (HDS) reaction. Further addition of Co leads to the segregation of Co[sub 9]S[sub 8], which acts as a support for highly dispersed Co-promoted MoS[sub 2] crystallites. As a result of this structural effect, the Co-MoS[sub 2] crystallites become better accessible and the catalytic activity increases again above Co/(Co + Mo) = 0.2. The observed increase in activity upon physical mixing of Co-promoted MoS[sub 2] and Co[sub 9]S[sub 8] might also be explained by such a structural effect, rather than by a remote-control effect. 32 refs., 7 figs., 1 tab.

• OSTI ID: 7027910
• Journal Information: Journal of Catalysis; (United States), Vol. 147:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
01 COAL, LIGNITE, AND PEAT
BUTENES
HYDROGENATION
COBALT SULFIDES
CATALYTIC EFFECTS
MOLYBDENUM SULFIDES
THIOPHENE
DESULFURIZATION
ELECTRON MICROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
X-RAY DIFFRACTION
ALKENES
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
MICROSCOPY
MOLYBDENUM COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
010402 - Coal
Lignite
& Peat- Purification & Upgrading