The effect of the precursor on the characteristics of Co/SiO2 catalysts

M. K. Niemelä; A. O.I. Krause; T. Vaara; Jari J. Kiviaho; Matti K.O. Reinikainen

doi:10.1016/S0926-860X(96)00216-5

The effect of the precursor on the characteristics of Co/SiO₂ catalysts

M. K. Niemelä, A. O.I. Krause^*, T. Vaara, Jari J. Kiviaho, Matti K.O. Reinikainen

^*Corresponding author for this work

BA5205 Chemical and polymer synthesis

Helsinki University of Technology

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

40 Citations (Scopus)

Abstract

The effect of the precursor on the characteristics of the Co/SiO₂ catalysts prepared from Co(NO₃)₂, Co₂(CO)₈ and Co₄(CO)¹² was determined. The near-surface reduction was clearly lower for the Co₂(CO)₈ derived catalyst than for the Co₄(CO)₁₂ based one. The hydrogen chemisorption, CO desorption, XRD and XPS measurements indicated that the dispersion of the metallic species decreased in the precursor order Co₂(CO)₈ > Co₄(CO)₁₂ ≫ Co(NO₃)₂. The TPD studies showed that CO was more strongly adsorbed on catalysts derived from carbonyls than on those based on nitrate, resulting in greater initial activity in CO hydrogenation. In pulsed CO hydrogenation reactions, the selectivity of the Co₂(CO)₈ derived catalyst differed from the other two. Thus, despite the well documented transformation of the Co₂(CO)₈ to Co₄(CO)₁₂ on the silica support, the supported catalysts derived from these two precursors exhibited distinct characteristics and reactivity.

Original language	English
Pages (from-to)	325-345
Journal	Applied Catalysis A: General
Volume	147
Issue number	2
DOIs	https://doi.org/10.1016/S0926-860X(96)00216-5
Publication status	Published - 2 Dec 1996
MoE publication type	A1 Journal article-refereed

Funding

This work was supported with funding from the Technology Development Center of Finland. The authors appreciate the analytical assistance of the staff of the Analysis Center of the Helsinki University of Technology.

Keywords

Carbon monoxide hydrogenation
Characterization
Cobalt
Silica support
Synthesis gas

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10.1016/S0926-860X(96)00216-5

Cite this

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title = "The effect of the precursor on the characteristics of Co/SiO2 catalysts",

abstract = "The effect of the precursor on the characteristics of the Co/SiO2 catalysts prepared from Co(NO3)2, Co2(CO)8 and Co4(CO)12 was determined. The near-surface reduction was clearly lower for the Co2(CO)8 derived catalyst than for the Co4(CO)12 based one. The hydrogen chemisorption, CO desorption, XRD and XPS measurements indicated that the dispersion of the metallic species decreased in the precursor order Co2(CO)8 > Co4(CO)12 ≫ Co(NO3)2. The TPD studies showed that CO was more strongly adsorbed on catalysts derived from carbonyls than on those based on nitrate, resulting in greater initial activity in CO hydrogenation. In pulsed CO hydrogenation reactions, the selectivity of the Co2(CO)8 derived catalyst differed from the other two. Thus, despite the well documented transformation of the Co2(CO)8 to Co4(CO)12 on the silica support, the supported catalysts derived from these two precursors exhibited distinct characteristics and reactivity.",

keywords = "Carbon monoxide hydrogenation, Characterization, Cobalt, Silica support, Synthesis gas",

author = "Niemel{\"a}, {M. K.} and Krause, {A. O.I.} and T. Vaara and Kiviaho, {Jari J.} and Reinikainen, {Matti K.O.}",

note = "Funding Information: This work was supported with funding from the Technology Development Center of Finland. The authors appreciate the analytical assistance of the staff of the Analysis Center of the Helsinki University of Technology.",

year = "1996",

month = dec,

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doi = "10.1016/S0926-860X(96)00216-5",

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T1 - The effect of the precursor on the characteristics of Co/SiO2 catalysts

AU - Niemelä, M. K.

AU - Krause, A. O.I.

AU - Vaara, T.

AU - Kiviaho, Jari J.

AU - Reinikainen, Matti K.O.

N1 - Funding Information: This work was supported with funding from the Technology Development Center of Finland. The authors appreciate the analytical assistance of the staff of the Analysis Center of the Helsinki University of Technology.

PY - 1996/12/2

Y1 - 1996/12/2

N2 - The effect of the precursor on the characteristics of the Co/SiO2 catalysts prepared from Co(NO3)2, Co2(CO)8 and Co4(CO)12 was determined. The near-surface reduction was clearly lower for the Co2(CO)8 derived catalyst than for the Co4(CO)12 based one. The hydrogen chemisorption, CO desorption, XRD and XPS measurements indicated that the dispersion of the metallic species decreased in the precursor order Co2(CO)8 > Co4(CO)12 ≫ Co(NO3)2. The TPD studies showed that CO was more strongly adsorbed on catalysts derived from carbonyls than on those based on nitrate, resulting in greater initial activity in CO hydrogenation. In pulsed CO hydrogenation reactions, the selectivity of the Co2(CO)8 derived catalyst differed from the other two. Thus, despite the well documented transformation of the Co2(CO)8 to Co4(CO)12 on the silica support, the supported catalysts derived from these two precursors exhibited distinct characteristics and reactivity.

AB - The effect of the precursor on the characteristics of the Co/SiO2 catalysts prepared from Co(NO3)2, Co2(CO)8 and Co4(CO)12 was determined. The near-surface reduction was clearly lower for the Co2(CO)8 derived catalyst than for the Co4(CO)12 based one. The hydrogen chemisorption, CO desorption, XRD and XPS measurements indicated that the dispersion of the metallic species decreased in the precursor order Co2(CO)8 > Co4(CO)12 ≫ Co(NO3)2. The TPD studies showed that CO was more strongly adsorbed on catalysts derived from carbonyls than on those based on nitrate, resulting in greater initial activity in CO hydrogenation. In pulsed CO hydrogenation reactions, the selectivity of the Co2(CO)8 derived catalyst differed from the other two. Thus, despite the well documented transformation of the Co2(CO)8 to Co4(CO)12 on the silica support, the supported catalysts derived from these two precursors exhibited distinct characteristics and reactivity.

KW - Carbon monoxide hydrogenation

KW - Characterization

KW - Cobalt

KW - Silica support

KW - Synthesis gas

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