Reduced molybdenum formal oxidation states in hydrodesulfurization catalysis by Chevrel phases

M. E. Ekman; J. W. Anderegg; G. L. Schrader

doi:10.1016/0021-9517(89)90234-0

Reduced molybdenum formal oxidation states in hydrodesulfurization catalysis by Chevrel phases

M. E. Ekman, J. W. Anderegg, G. L. Schrader

Research output: Contribution to journal › Article › peer-review

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Abstract

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_6.2S₈, Lu_1.2xPbMo₆S₈ for 0 < x ≤ 0.2, and Lu_1.2x Pb_1-xMo₆S₈ for 0.2 < x ≤ 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 MoS₂). All Chevrel phase catalysts demonstrated low activity for 1-butene hydrogenation.

Original language	English (US)
Pages (from-to)	246-257
Number of pages	12
Journal	Journal of Catalysis
Volume	117
Issue number	1
DOIs	https://doi.org/10.1016/0021-9517(89)90234-0
State	Published - May 1989
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

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title = "Reduced molybdenum formal oxidation states in hydrodesulfurization catalysis by Chevrel phases",

abstract = "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 PbMo6.2S8, Lu1.2xPbMo6S8 for 0 < x ≤ 0.2, and Lu1.2x Pb1-xMo6S8 for 0.2 < x ≤ 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 MoS2). All Chevrel phase catalysts demonstrated low activity for 1-butene hydrogenation.",

author = "Ekman, {M. E.} and Anderegg, {J. W.} and Schrader, {G. L.}",

note = "Funding Information: Energy by Iowa State University under Contract W-7405Eng-82. This research was supported by the Office of Basic Energy Sciences, Chemical Sciences Division.",

year = "1989",

month = may,

doi = "10.1016/0021-9517(89)90234-0",

language = "English (US)",

volume = "117",

pages = "246--257",

journal = "Journal of Catalysis",

issn = "0021-9517",

publisher = "Academic Press Inc.",

number = "1",

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T1 - Reduced molybdenum formal oxidation states in hydrodesulfurization catalysis by Chevrel phases

AU - Ekman, M. E.

AU - Anderegg, J. W.

AU - Schrader, G. L.

N1 - Funding Information: Energy by Iowa State University under Contract W-7405Eng-82. This research was supported by the Office of Basic Energy Sciences, Chemical Sciences Division.

PY - 1989/5

Y1 - 1989/5

N2 - 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 PbMo6.2S8, Lu1.2xPbMo6S8 for 0 < x ≤ 0.2, and Lu1.2x Pb1-xMo6S8 for 0.2 < x ≤ 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 MoS2). All Chevrel phase catalysts demonstrated low activity for 1-butene hydrogenation.

AB - 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 PbMo6.2S8, Lu1.2xPbMo6S8 for 0 < x ≤ 0.2, and Lu1.2x Pb1-xMo6S8 for 0.2 < x ≤ 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 MoS2). All Chevrel phase catalysts demonstrated low activity for 1-butene hydrogenation.

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JO - Journal of Catalysis

JF - Journal of Catalysis

IS - 1

ER -

Reduced molybdenum formal oxidation states in hydrodesulfurization catalysis by Chevrel phases

Abstract

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