The observation of nanometer-sized entities in sulphided Mo-based catalysts on various supports

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Abstract

The progressive sulfidation of molybdenum-based hydrotreating model catalysts is studied using HRTEM and XPS. The catalysts are sulfided quasi in situ and prepd. for TEM measurements in a glovebox. Subsequently, a specially developed vacuum-transfer specimen holder is used for transfer to the TEM. Using this procedure, a previously unknown feature is obsd. in the catalysts. Apart from the well-known slab-like structure of bulk molybdenum disulfide, nanometer-sized spherical entities of molybdenum sulfide or oxysulfide are obsd. For a series of model Co-Mo/silica catalysts, these \"spots\" predominantly occur after mild sulfidation procedures. At higher sulfidation temps., these spots exist next to the slabs of MoS2-like material. Comparison with practical molybdenum-based hydrotreating catalysts shows that these, too, can contain spots next to or instead of slabs, depending on precursor prepn. and sulfidation procedures. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)49-53
JournalCatalysis Letters
Volume74
Issue number1-2
DOIs
Publication statusPublished - 2001

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Catalyst supports
Molybdenum
Catalysts
Transmission electron microscopy
Silicon Dioxide
X ray photoelectron spectroscopy
Silica
Vacuum
molybdenum disulfide

Cite this

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title = "The observation of nanometer-sized entities in sulphided Mo-based catalysts on various supports",
abstract = "The progressive sulfidation of molybdenum-based hydrotreating model catalysts is studied using HRTEM and XPS. The catalysts are sulfided quasi in situ and prepd. for TEM measurements in a glovebox. Subsequently, a specially developed vacuum-transfer specimen holder is used for transfer to the TEM. Using this procedure, a previously unknown feature is obsd. in the catalysts. Apart from the well-known slab-like structure of bulk molybdenum disulfide, nanometer-sized spherical entities of molybdenum sulfide or oxysulfide are obsd. For a series of model Co-Mo/silica catalysts, these \{"}spots\{"} predominantly occur after mild sulfidation procedures. At higher sulfidation temps., these spots exist next to the slabs of MoS2-like material. Comparison with practical molybdenum-based hydrotreating catalysts shows that these, too, can contain spots next to or instead of slabs, depending on precursor prepn. and sulfidation procedures. [on SciFinder (R)]",
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The observation of nanometer-sized entities in sulphided Mo-based catalysts on various supports. / Kooyman, P.J.; Hensen, E.J.M.; Jong, de, A.M.; Niemantsverdriet, J.W.; Veen, van, J.A.R.

In: Catalysis Letters, Vol. 74, No. 1-2, 2001, p. 49-53.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - The observation of nanometer-sized entities in sulphided Mo-based catalysts on various supports

AU - Kooyman, P.J.

AU - Hensen, E.J.M.

AU - Jong, de, A.M.

AU - Niemantsverdriet, J.W.

AU - Veen, van, J.A.R.

PY - 2001

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N2 - The progressive sulfidation of molybdenum-based hydrotreating model catalysts is studied using HRTEM and XPS. The catalysts are sulfided quasi in situ and prepd. for TEM measurements in a glovebox. Subsequently, a specially developed vacuum-transfer specimen holder is used for transfer to the TEM. Using this procedure, a previously unknown feature is obsd. in the catalysts. Apart from the well-known slab-like structure of bulk molybdenum disulfide, nanometer-sized spherical entities of molybdenum sulfide or oxysulfide are obsd. For a series of model Co-Mo/silica catalysts, these \"spots\" predominantly occur after mild sulfidation procedures. At higher sulfidation temps., these spots exist next to the slabs of MoS2-like material. Comparison with practical molybdenum-based hydrotreating catalysts shows that these, too, can contain spots next to or instead of slabs, depending on precursor prepn. and sulfidation procedures. [on SciFinder (R)]

AB - The progressive sulfidation of molybdenum-based hydrotreating model catalysts is studied using HRTEM and XPS. The catalysts are sulfided quasi in situ and prepd. for TEM measurements in a glovebox. Subsequently, a specially developed vacuum-transfer specimen holder is used for transfer to the TEM. Using this procedure, a previously unknown feature is obsd. in the catalysts. Apart from the well-known slab-like structure of bulk molybdenum disulfide, nanometer-sized spherical entities of molybdenum sulfide or oxysulfide are obsd. For a series of model Co-Mo/silica catalysts, these \"spots\" predominantly occur after mild sulfidation procedures. At higher sulfidation temps., these spots exist next to the slabs of MoS2-like material. Comparison with practical molybdenum-based hydrotreating catalysts shows that these, too, can contain spots next to or instead of slabs, depending on precursor prepn. and sulfidation procedures. [on SciFinder (R)]

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JO - Catalysis Letters

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SN - 1011-372X

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