Pretreatment of new reduced ternary molybdenum sulfide catalysts

R. Kirk Thompson; Shane J. Hilsenbeck; Thomas J. Paskach; Robert E. McCarley; Glenn L. Schrader

doi:10.1016/S1381-1169(00)00143-6

Pretreatment of new reduced ternary molybdenum sulfide catalysts

R. Kirk Thompson, Shane J. Hilsenbeck, Thomas J. Paskach, Robert E. McCarley, Glenn L. Schrader

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

10 Scopus citations

Abstract

Pretreatment of a new lanthanum molybdenum sulfide (LaMoS) hydrodesulfurization (HSD) catalyst in flowing H₂ has been investigated. Following pretreatment up to 800°C, the catalyst surface area decreased from 175 to 11 m²/g; the average pore diameter increased due to the loss of pore diameters smaller than 100 Å. TPD characterization of the as-prepared LaMoS was used to monitor the evolution of solvents and adsorbed materials up to 800°C. The Mo oxidation state was examined after various pretreatment procedures using X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR). Following temperature-programmed desorption (TPD), two types of surface oxygen were detected which could be reduced at 250°C and 950°C by a flow of 10% H₂ in N₂. Transformation of the amorphous LaMoS to the corresponding crystalline Chevrel phase [La(Mo₆S₈)] was detected at 1000°C using TPR and x-ray diffraction (XRD). (C) 2000 Elsevier Science B.V.

Original language	English (US)
Pages (from-to)	75-87
Number of pages	13
Journal	Journal of Molecular Catalysis A: Chemical
Volume	161
Issue number	1-2
DOIs	https://doi.org/10.1016/S1381-1169(00)00143-6
State	Published - Nov 6 2000
Externally published	Yes

Keywords

Amorphous ternary molybdenum sulfides
Chevrel phases
H pretreatment
Hydrodesulfurization
Metal sulfide clusters

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology
Physical and Theoretical Chemistry

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10.1016/S1381-1169(00)00143-6

Cite this

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title = "Pretreatment of new reduced ternary molybdenum sulfide catalysts",

abstract = "Pretreatment of a new lanthanum molybdenum sulfide (LaMoS) hydrodesulfurization (HSD) catalyst in flowing H2 has been investigated. Following pretreatment up to 800°C, the catalyst surface area decreased from 175 to 11 m2/g; the average pore diameter increased due to the loss of pore diameters smaller than 100 {\AA}. TPD characterization of the as-prepared LaMoS was used to monitor the evolution of solvents and adsorbed materials up to 800°C. The Mo oxidation state was examined after various pretreatment procedures using X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR). Following temperature-programmed desorption (TPD), two types of surface oxygen were detected which could be reduced at 250°C and 950°C by a flow of 10% H2 in N2. Transformation of the amorphous LaMoS to the corresponding crystalline Chevrel phase [La(Mo6S8)] was detected at 1000°C using TPR and x-ray diffraction (XRD). (C) 2000 Elsevier Science B.V.",

keywords = "Amorphous ternary molybdenum sulfides, Chevrel phases, H pretreatment, Hydrodesulfurization, Metal sulfide clusters",

author = "Thompson, {R. Kirk} and Hilsenbeck, {Shane J.} and Paskach, {Thomas J.} and McCarley, {Robert E.} and Schrader, {Glenn L.}",

note = "Funding Information: This research was sponsored by a grant from Akzo Nobel. Assistance from the Ames Laboratory is also acknowledged. The Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. W-7405-Eng-82.",

year = "2000",

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doi = "10.1016/S1381-1169(00)00143-6",

language = "English (US)",

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pages = "75--87",

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AU - Thompson, R. Kirk

AU - Hilsenbeck, Shane J.

AU - Paskach, Thomas J.

AU - McCarley, Robert E.

AU - Schrader, Glenn L.

N1 - Funding Information: This research was sponsored by a grant from Akzo Nobel. Assistance from the Ames Laboratory is also acknowledged. The Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. W-7405-Eng-82.

PY - 2000/11/6

Y1 - 2000/11/6

N2 - Pretreatment of a new lanthanum molybdenum sulfide (LaMoS) hydrodesulfurization (HSD) catalyst in flowing H2 has been investigated. Following pretreatment up to 800°C, the catalyst surface area decreased from 175 to 11 m2/g; the average pore diameter increased due to the loss of pore diameters smaller than 100 Å. TPD characterization of the as-prepared LaMoS was used to monitor the evolution of solvents and adsorbed materials up to 800°C. The Mo oxidation state was examined after various pretreatment procedures using X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR). Following temperature-programmed desorption (TPD), two types of surface oxygen were detected which could be reduced at 250°C and 950°C by a flow of 10% H2 in N2. Transformation of the amorphous LaMoS to the corresponding crystalline Chevrel phase [La(Mo6S8)] was detected at 1000°C using TPR and x-ray diffraction (XRD). (C) 2000 Elsevier Science B.V.

AB - Pretreatment of a new lanthanum molybdenum sulfide (LaMoS) hydrodesulfurization (HSD) catalyst in flowing H2 has been investigated. Following pretreatment up to 800°C, the catalyst surface area decreased from 175 to 11 m2/g; the average pore diameter increased due to the loss of pore diameters smaller than 100 Å. TPD characterization of the as-prepared LaMoS was used to monitor the evolution of solvents and adsorbed materials up to 800°C. The Mo oxidation state was examined after various pretreatment procedures using X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR). Following temperature-programmed desorption (TPD), two types of surface oxygen were detected which could be reduced at 250°C and 950°C by a flow of 10% H2 in N2. Transformation of the amorphous LaMoS to the corresponding crystalline Chevrel phase [La(Mo6S8)] was detected at 1000°C using TPR and x-ray diffraction (XRD). (C) 2000 Elsevier Science B.V.

KW - Amorphous ternary molybdenum sulfides

KW - Chevrel phases

KW - H pretreatment

KW - Hydrodesulfurization

KW - Metal sulfide clusters

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Pretreatment of new reduced ternary molybdenum sulfide catalysts

Abstract

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