Pathways for H2 Activation on (Ni)-MoS2 Catalysts

Eva Schachtl; Elena Kondratieva; Oliver Y. Gutiérrez; Johannes A. Lercher

doi:10.1021/acs.jpclett.5b01217

Pathways for H₂ Activation on (Ni)-MoS₂ Catalysts

Eva Schachtl, Elena Kondratieva, Oliver Y. Gutiérrez, Johannes A. Lercher

Chair of Chemical Technology II

Technical University of Munich

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

38 Scopus citations

Abstract

The activation of H₂ and H₂S on (Ni)MoS₂/Al₂O₃ leads to the formation of SH groups with acid character able to protonate 2,6-dimethylpyridine. The variation in concentrations of SH groups induced by H₂ and H₂S adsorption shows that both molecules dissociate on coordinatively unsaturated cations and neighboring S^2-. In the studied materials, one sulfur vacancy and four SH groups per 10 metal atoms exist at the active edges of MoS₂ under the conditions studied. H₂-D₂ exchange studies show that Ni increases the concentration of active surface hydrogen by up to 30% at the optimum Ni loading, by increasing the concentration of H₂ and H₂S chemisorption sites.

Original language	English
Pages (from-to)	2929-2932
Number of pages	4
Journal	Journal of Physical Chemistry Letters
Volume	6
Issue number	15
DOIs	https://doi.org/10.1021/acs.jpclett.5b01217
State	Published - 6 Aug 2015

Keywords

H activation
MoS
Ni promotion
isotopic exchange
spectroscopic characterization

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10.1021/acs.jpclett.5b01217

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title = "Pathways for H2 Activation on (Ni)-MoS2 Catalysts",

abstract = "The activation of H2 and H2S on (Ni)MoS2/Al2O3 leads to the formation of SH groups with acid character able to protonate 2,6-dimethylpyridine. The variation in concentrations of SH groups induced by H2 and H2S adsorption shows that both molecules dissociate on coordinatively unsaturated cations and neighboring S2-. In the studied materials, one sulfur vacancy and four SH groups per 10 metal atoms exist at the active edges of MoS2 under the conditions studied. H2-D2 exchange studies show that Ni increases the concentration of active surface hydrogen by up to 30% at the optimum Ni loading, by increasing the concentration of H2 and H2S chemisorption sites.",

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AU - Schachtl, Eva

AU - Kondratieva, Elena

AU - Gutiérrez, Oliver Y.

AU - Lercher, Johannes A.

PY - 2015/8/6

Y1 - 2015/8/6

N2 - The activation of H2 and H2S on (Ni)MoS2/Al2O3 leads to the formation of SH groups with acid character able to protonate 2,6-dimethylpyridine. The variation in concentrations of SH groups induced by H2 and H2S adsorption shows that both molecules dissociate on coordinatively unsaturated cations and neighboring S2-. In the studied materials, one sulfur vacancy and four SH groups per 10 metal atoms exist at the active edges of MoS2 under the conditions studied. H2-D2 exchange studies show that Ni increases the concentration of active surface hydrogen by up to 30% at the optimum Ni loading, by increasing the concentration of H2 and H2S chemisorption sites.

AB - The activation of H2 and H2S on (Ni)MoS2/Al2O3 leads to the formation of SH groups with acid character able to protonate 2,6-dimethylpyridine. The variation in concentrations of SH groups induced by H2 and H2S adsorption shows that both molecules dissociate on coordinatively unsaturated cations and neighboring S2-. In the studied materials, one sulfur vacancy and four SH groups per 10 metal atoms exist at the active edges of MoS2 under the conditions studied. H2-D2 exchange studies show that Ni increases the concentration of active surface hydrogen by up to 30% at the optimum Ni loading, by increasing the concentration of H2 and H2S chemisorption sites.

KW - H activation

KW - MoS

KW - Ni promotion

KW - isotopic exchange

KW - spectroscopic characterization

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Pathways for H₂ Activation on (Ni)-MoS₂ Catalysts

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Keywords

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