In situ laser raman spectroscopy of the sulfiding of Mo γ-Al2O3 catalysts

G. L. Schrader; C. P. Cheng

doi:10.1016/0021-9517(83)90262-2

In situ laser raman spectroscopy of the sulfiding of Mo γ-Al₂O₃ catalysts

G. L. Schrader
, C. P. Cheng

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

150 Scopus citations

Abstract

Raman spectra of sulfided Mo γ-Al₂O₃ catalysts were obtained using in situ techniques for two sulfiding methods. For samples sulfided by 10% H₂S H₂ at 400 °C, MoS₂ structures were observed. A stepwise sulfiding using 10% H₂S H₂, with spectra recorded at 150, 250, and 350 °C, resulted in observation of molybdenum oxysulfide, reduced molybdate, and surface "MoS₂" phases. Reexposure of these samples to air led to radical modification of the oxysulfide structures as well as transformation of some sulfide phases. A model incorporating terminal and bridging MoS bonding and anion vacancies is proposed. This model is based on the conversion of isolated and aggregated molybdate and MoO₃ species to oxysulfide and reduced molybdenum phases. Conversion of reduced molybdenum phases to sulfides is observed to be slow.

Original language	English (US)
Pages (from-to)	369-385
Number of pages	17
Journal	Journal of Catalysis
Volume	80
Issue number	2
DOIs	https://doi.org/10.1016/0021-9517(83)90262-2
State	Published - Apr 1983
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

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10.1016/0021-9517(83)90262-2

Cite this

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title = "In situ laser raman spectroscopy of the sulfiding of Mo γ-Al2O3 catalysts",

abstract = "Raman spectra of sulfided Mo γ-Al2O3 catalysts were obtained using in situ techniques for two sulfiding methods. For samples sulfided by 10\% H2S H2 at 400 °C, MoS2 structures were observed. A stepwise sulfiding using 10\% H2S H2, with spectra recorded at 150, 250, and 350 °C, resulted in observation of molybdenum oxysulfide, reduced molybdate, and surface {"}MoS2{"} phases. Reexposure of these samples to air led to radical modification of the oxysulfide structures as well as transformation of some sulfide phases. A model incorporating terminal and bridging MoS bonding and anion vacancies is proposed. This model is based on the conversion of isolated and aggregated molybdate and MoO3 species to oxysulfide and reduced molybdenum phases. Conversion of reduced molybdenum phases to sulfides is observed to be slow.",

author = "Schrader, \{G. L.\} and Cheng, \{C. P.\}",

year = "1983",

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doi = "10.1016/0021-9517(83)90262-2",

language = "English (US)",

volume = "80",

pages = "369--385",

journal = "Journal of Catalysis",

issn = "0021-9517",

publisher = "Academic Press Inc.",

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TY - JOUR

T1 - In situ laser raman spectroscopy of the sulfiding of Mo γ-Al2O3 catalysts

AU - Schrader, G. L.

AU - Cheng, C. P.

PY - 1983/4

Y1 - 1983/4

N2 - Raman spectra of sulfided Mo γ-Al2O3 catalysts were obtained using in situ techniques for two sulfiding methods. For samples sulfided by 10% H2S H2 at 400 °C, MoS2 structures were observed. A stepwise sulfiding using 10% H2S H2, with spectra recorded at 150, 250, and 350 °C, resulted in observation of molybdenum oxysulfide, reduced molybdate, and surface "MoS2" phases. Reexposure of these samples to air led to radical modification of the oxysulfide structures as well as transformation of some sulfide phases. A model incorporating terminal and bridging MoS bonding and anion vacancies is proposed. This model is based on the conversion of isolated and aggregated molybdate and MoO3 species to oxysulfide and reduced molybdenum phases. Conversion of reduced molybdenum phases to sulfides is observed to be slow.

AB - Raman spectra of sulfided Mo γ-Al2O3 catalysts were obtained using in situ techniques for two sulfiding methods. For samples sulfided by 10% H2S H2 at 400 °C, MoS2 structures were observed. A stepwise sulfiding using 10% H2S H2, with spectra recorded at 150, 250, and 350 °C, resulted in observation of molybdenum oxysulfide, reduced molybdate, and surface "MoS2" phases. Reexposure of these samples to air led to radical modification of the oxysulfide structures as well as transformation of some sulfide phases. A model incorporating terminal and bridging MoS bonding and anion vacancies is proposed. This model is based on the conversion of isolated and aggregated molybdate and MoO3 species to oxysulfide and reduced molybdenum phases. Conversion of reduced molybdenum phases to sulfides is observed to be slow.

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DO - 10.1016/0021-9517(83)90262-2

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SN - 0021-9517

VL - 80

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JO - Journal of Catalysis

JF - Journal of Catalysis

IS - 2

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In situ laser raman spectroscopy of the sulfiding of Mo γ-Al₂O₃ catalysts

Abstract

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