Sulfidation of carbon-supported iron-molybdemum oxide catalysts

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

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Abstract

Carbon-supported iron-molybdenum sulphide catalysts were characterized by means of Mössbauer spectroscopy at temperatures down to 4.2 K. Thiophene hydrodesulphurization (HDS) activity measurements were performed at 673 K in a flow microreactor operating at atmospheric pressure. The molybdenum content was 9.5 wt.-% whereas the iron content varied from 0.6 to 9.0 wt.-%. Sequential deposition (Molybdenum first) by pore-volume impregnation was employed to prepare oxidic catalyst precursors. The oxidic catalyst precursors were dried at 293 K in an air flow, followed by an additional hydrogen treatment up to 393 K. The type and relative particle sizes of the iron compounds present in the oxidic precursors and in the sulphided and reoxidized catalysts were determined by Mössbauer spectroscopy. It was demonstrated that after sulphidation for 4 h at 623 K, the composition of the sulphide catalyst depends on the iron content. Sulphided Fe-Mo/C catalysts contain a mixed "FeMoS" phase and "Fe-sulphide". The former is responsible for the observed promoting effect toward thiophene HDS. From the temperature dependence of the resonant absorption areas, it was concluded that the iron atoms in the "FeMoS" phase are located at the surface of MoS2 microcrystals. The amount of "Fe-sulphide" present in the catalyst was found to increase with increasing iron content. This "Fe-sulphide" might partly cover the "FeMoS" phase, thus causing a decrease in the promoting effect.
Original languageEnglish
Pages (from-to)217-239
Number of pages23
JournalApplied Catalysis
Volume54
Issue number1
DOIs
Publication statusPublished - 1989

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Iron oxides
Catalysts
Carbon
Iron
Molybdenum
Thiophene
Spectroscopy
Iron compounds
Microcrystals
Impregnation
Atmospheric pressure
Particle size
Sulfides
Atoms
Hydrogen
Temperature
Air
Chemical analysis

Cite this

Ramselaar, W. L. T. M., Crajé, M. W. J., Gerkema, E., Beer, de, V. H. J., & Kraan, van der, A. M. (1989). Sulfidation of carbon-supported iron-molybdemum oxide catalysts. Applied Catalysis, 54(1), 217-239. https://doi.org/10.1016/S0166-9834(00)82366-0
Ramselaar, W.L.T.M. ; Crajé, M.W.J. ; Gerkema, E. ; Beer, de, V.H.J. ; Kraan, van der, A.M. / Sulfidation of carbon-supported iron-molybdemum oxide catalysts. In: Applied Catalysis. 1989 ; Vol. 54, No. 1. pp. 217-239.
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Ramselaar, WLTM, Crajé, MWJ, Gerkema, E, Beer, de, VHJ & Kraan, van der, AM 1989, 'Sulfidation of carbon-supported iron-molybdemum oxide catalysts', Applied Catalysis, vol. 54, no. 1, pp. 217-239. https://doi.org/10.1016/S0166-9834(00)82366-0

Sulfidation of carbon-supported iron-molybdemum oxide catalysts. / Ramselaar, W.L.T.M.; Crajé, M.W.J.; Gerkema, E.; Beer, de, V.H.J.; Kraan, van der, A.M.

In: Applied Catalysis, Vol. 54, No. 1, 1989, p. 217-239.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Sulfidation of carbon-supported iron-molybdemum oxide catalysts

AU - Ramselaar, W.L.T.M.

AU - Crajé, M.W.J.

AU - Gerkema, E.

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

AU - Kraan, van der, A.M.

PY - 1989

Y1 - 1989

N2 - Carbon-supported iron-molybdenum sulphide catalysts were characterized by means of Mössbauer spectroscopy at temperatures down to 4.2 K. Thiophene hydrodesulphurization (HDS) activity measurements were performed at 673 K in a flow microreactor operating at atmospheric pressure. The molybdenum content was 9.5 wt.-% whereas the iron content varied from 0.6 to 9.0 wt.-%. Sequential deposition (Molybdenum first) by pore-volume impregnation was employed to prepare oxidic catalyst precursors. The oxidic catalyst precursors were dried at 293 K in an air flow, followed by an additional hydrogen treatment up to 393 K. The type and relative particle sizes of the iron compounds present in the oxidic precursors and in the sulphided and reoxidized catalysts were determined by Mössbauer spectroscopy. It was demonstrated that after sulphidation for 4 h at 623 K, the composition of the sulphide catalyst depends on the iron content. Sulphided Fe-Mo/C catalysts contain a mixed "FeMoS" phase and "Fe-sulphide". The former is responsible for the observed promoting effect toward thiophene HDS. From the temperature dependence of the resonant absorption areas, it was concluded that the iron atoms in the "FeMoS" phase are located at the surface of MoS2 microcrystals. The amount of "Fe-sulphide" present in the catalyst was found to increase with increasing iron content. This "Fe-sulphide" might partly cover the "FeMoS" phase, thus causing a decrease in the promoting effect.

AB - Carbon-supported iron-molybdenum sulphide catalysts were characterized by means of Mössbauer spectroscopy at temperatures down to 4.2 K. Thiophene hydrodesulphurization (HDS) activity measurements were performed at 673 K in a flow microreactor operating at atmospheric pressure. The molybdenum content was 9.5 wt.-% whereas the iron content varied from 0.6 to 9.0 wt.-%. Sequential deposition (Molybdenum first) by pore-volume impregnation was employed to prepare oxidic catalyst precursors. The oxidic catalyst precursors were dried at 293 K in an air flow, followed by an additional hydrogen treatment up to 393 K. The type and relative particle sizes of the iron compounds present in the oxidic precursors and in the sulphided and reoxidized catalysts were determined by Mössbauer spectroscopy. It was demonstrated that after sulphidation for 4 h at 623 K, the composition of the sulphide catalyst depends on the iron content. Sulphided Fe-Mo/C catalysts contain a mixed "FeMoS" phase and "Fe-sulphide". The former is responsible for the observed promoting effect toward thiophene HDS. From the temperature dependence of the resonant absorption areas, it was concluded that the iron atoms in the "FeMoS" phase are located at the surface of MoS2 microcrystals. The amount of "Fe-sulphide" present in the catalyst was found to increase with increasing iron content. This "Fe-sulphide" might partly cover the "FeMoS" phase, thus causing a decrease in the promoting effect.

U2 - 10.1016/S0166-9834(00)82366-0

DO - 10.1016/S0166-9834(00)82366-0

M3 - Article

VL - 54

SP - 217

EP - 239

JO - Applied Catalysis

JF - Applied Catalysis

SN - 0166-9834

IS - 1

ER -

Ramselaar WLTM, Crajé MWJ, Gerkema E, Beer, de VHJ, Kraan, van der AM. Sulfidation of carbon-supported iron-molybdemum oxide catalysts. Applied Catalysis. 1989;54(1):217-239. https://doi.org/10.1016/S0166-9834(00)82366-0