Reduced molybdenum formal oxidation states in hydrodesulfurization catalysis by Chevrel phases

Journal Article · Mon May 01 04:00:00 EDT 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90234-0· OSTI ID:6356205

Ekman, M E; Anderegg, J W; Schrader, G L ^[1]

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1. Iowa State Univ., Ames (USA)

The effect of the oxidation state of molybdenum on the catalytic hydrodesulfurization (HDS) of thiophene was investigated using a series of lead-lutetium Chevrel phases. Polycrystalline catalysts were prepared with compositions of PbMo{sub 6.2}S{sub 8}, Lu{sub 1.2x}PbMo{sub 6}S{sub 8} for 0 < {times} {le} 0.2, and Lu{sub 1.2x}Pb{sub 1{minus}x}Mo{sub 6}S{sub 8} for 0.2 < {times} {le} 1. Fresh and used (10-h thiophene reaction) catalysts were characterized by X-ray powder diffraction, laser Raman spectroscopy, and X-ray photoelectron spectroscopy. Bulk structures and molybdenum oxidation states were found to be stable. HDS activity could be related to the molybdenum formal oxidation state: the maximum rate of thiophene HDS was observed for catalysts having reduced oxidation states (compared to MoS{sub 2}). All Chevrel phase catalysts demonstrated low activity for 1-butene hydrogenation. 59 refs.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6356205
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 117:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

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ALKENES
BUTENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL STATE
COHERENT SCATTERING
DESULFURIZATION
DIFFRACTION
ELECTRON SPECTROSCOPY
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGENATION
LASER SPECTROSCOPY
LASERS
LEAD COMPOUNDS
LUTETIUM COMPOUNDS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
RAMAN SPECTROSCOPY
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SPECTROSCOPY
SURFACE PROPERTIES
THIOPHENE
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY