Hydrodesulfurization catalysis by Chevrel-phase compounds
The catalytic activity of Chevrel-phase compounds (M/sub x/Mo/sub 6/S/sub 8/) for thiophene hydrodesulfurization at 400/sup 0/C has been found to be comparable to or greater than that of model industrial catalysts (unpromoted and cobalt-promoted MoS/sub 2/). The most active Chevrel phase catalysts were those containing the large ternary component cations Ho, Pb, Sn; the intermediate cation materials (M = Ag and In) were less active; the small cation materials (M = Cu, Fe, Ni, and Co) were the least active catalysts. The 1-butene hydrogenation activities of the Chevrel phase catalysts at 400/sup 0/C were much lower than MoS/sub 2/. X-ray powder diffraction and laser Raman spectroscopy analysis of the used catalysts revealed that the bulk structures were stable under reaction conditions. Using a deuterium-thiophene feed at 400/sup 0/C, the amount of deuterium incorporated into thiophene and into the desulfurization products (hydrogen sulfide, butadiene, and butenes) was determined as a function of reaction time. For All Chevrel phase and MoS/sub 2/ catalysts examined, H/sub 2/S was almost exclusively formed; only small amounts of HDS and D/sub 2/S were detected. At the same levels of thiophene conversion, unpromoted MoS/sub 2/ introduced up to 10 times more deuterium into the nondesulfurized thiophene than did the promoted catalysts. A mechanism of thiophene hydrodesulfurization is proposed: butadiene is the initial reaction product and the hydrogen of hydrogen sulfide originates from the hydrogen-exchange of thiophene.
- Research Organization:
- Iowa State Univ. of Science and Technology, Ames (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6365801
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MOLYBDENUM COMPOUNDS
CATALYTIC EFFECTS
MOLYBDENUM SULFIDES
THIOPHENE
DESULFURIZATION
BUTADIENE
BUTENES
CATALYSIS
CATALYSTS
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
DEUTERIUM
HYDROGEN SULFIDES
HYDROGENATION
RAMAN SPECTROSCOPY
STABILITY
SYNTHESIS
TRACER TECHNIQUES
X-RAY DIFFRACTION
ALKENES
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DIENES
DIFFRACTION
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LASER SPECTROSCOPY
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POLYENES
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SCATTERING
SPECTROSCOPY
STABLE ISOTOPES
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
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