Stability of the so-called "Co-Mo-S" phase in a carbon-supported Co-Mo sulfide catalyst at very low Co/Mo ratio

M.W.J. Crajé; E. Gerkema; V.H.J. Beer, de; A.M. Kraan, van der

doi:10.1007/BF02405724

Stability of the so-called "Co-Mo-S" phase in a carbon-supported Co-Mo sulfide catalyst at very low Co/Mo ratio

M.W.J. Crajé, E. Gerkema, V.H.J. Beer, de, A.M. Kraan, van der

Inorganic Materials & Catalysis

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Abstract

Several aspects of the stability of the so-called "Co-Mo-S" phase in a fully sulfided Co(0.04)Mo(6.84)/C (wt%) catalyst have been examined by Mössbauer emission spectroscopy. The "Co-Mo-S" parameters turned out to be unchanged when the catalyst is exposed for 23 days to ambient air at room temperature. However, if this exposure to air is extended for over 100 days, the so-called "Co-Mo-S" phase was found to be oxidized to a high-spin Fe2+ phase which has no strong interaction with the "MoS2" particles. After resulfidation of the catalyst the so-called "Co-Mo-S" phase is formed again.

Original language	English
Pages (from-to)	1795-1799
Number of pages	5
Journal	Hyperfine Interactions
Volume	57
Issue number	1-4
DOIs	https://doi.org/10.1007/BF02405724
Publication status	Published - 1990

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title = "Stability of the so-called {"}Co-Mo-S{"} phase in a carbon-supported Co-Mo sulfide catalyst at very low Co/Mo ratio",

abstract = "Several aspects of the stability of the so-called {"}Co-Mo-S{"} phase in a fully sulfided Co(0.04)Mo(6.84)/C (wt%) catalyst have been examined by M{\"o}ssbauer emission spectroscopy. The {"}Co-Mo-S{"} parameters turned out to be unchanged when the catalyst is exposed for 23 days to ambient air at room temperature. However, if this exposure to air is extended for over 100 days, the so-called {"}Co-Mo-S{"} phase was found to be oxidized to a high-spin Fe2+ phase which has no strong interaction with the {"}MoS2{"} particles. After resulfidation of the catalyst the so-called {"}Co-Mo-S{"} phase is formed again.",

author = "M.W.J. Craj{\'e} and E. Gerkema and {Beer, de}, V.H.J. and {Kraan, van der}, A.M.",

year = "1990",

doi = "10.1007/BF02405724",

language = "English",

volume = "57",

pages = "1795--1799",

journal = "Hyperfine Interactions",

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T1 - Stability of the so-called "Co-Mo-S" phase in a carbon-supported Co-Mo sulfide catalyst at very low Co/Mo ratio

AU - Crajé, M.W.J.

AU - Gerkema, E.

AU - Beer, de, V.H.J.

AU - Kraan, van der, A.M.

PY - 1990

Y1 - 1990

N2 - Several aspects of the stability of the so-called "Co-Mo-S" phase in a fully sulfided Co(0.04)Mo(6.84)/C (wt%) catalyst have been examined by Mössbauer emission spectroscopy. The "Co-Mo-S" parameters turned out to be unchanged when the catalyst is exposed for 23 days to ambient air at room temperature. However, if this exposure to air is extended for over 100 days, the so-called "Co-Mo-S" phase was found to be oxidized to a high-spin Fe2+ phase which has no strong interaction with the "MoS2" particles. After resulfidation of the catalyst the so-called "Co-Mo-S" phase is formed again.

AB - Several aspects of the stability of the so-called "Co-Mo-S" phase in a fully sulfided Co(0.04)Mo(6.84)/C (wt%) catalyst have been examined by Mössbauer emission spectroscopy. The "Co-Mo-S" parameters turned out to be unchanged when the catalyst is exposed for 23 days to ambient air at room temperature. However, if this exposure to air is extended for over 100 days, the so-called "Co-Mo-S" phase was found to be oxidized to a high-spin Fe2+ phase which has no strong interaction with the "MoS2" particles. After resulfidation of the catalyst the so-called "Co-Mo-S" phase is formed again.

U2 - 10.1007/BF02405724

DO - 10.1007/BF02405724

M3 - Article

SN - 0304-3843

VL - 57

SP - 1795

EP - 1799

JO - Hyperfine Interactions

JF - Hyperfine Interactions

IS - 1-4

ER -

Stability of the so-called "Co-Mo-S" phase in a carbon-supported Co-Mo sulfide catalyst at very low Co/Mo ratio

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