Design of supported cobalt catalysts with maximum activity for the Fischer-Tropsch synthesis

Johan P. den Breejen; Jelle R.A. Sietsma; Heiner Friedrich; Johannes H. Bitter; Krijn P. de Jong

doi:10.1016/j.jcat.2009.12.015

Design of supported cobalt catalysts with maximum activity for the Fischer-Tropsch synthesis

Johan P. den Breejen, Jelle R.A. Sietsma, Heiner Friedrich, Johannes H. Bitter, Krijn P. de Jong

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

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Abstract

The role of the cobalt particle size distribution in the Fischer-Tropsch (FT) reaction for supported Co catalysts was investigated. Using TEM histogram analyses and activity measurements of carbon nanofiber-supported catalysts, the TOF of discrete Co particle sizes was calculated. It was found that cobalt particles of 4.7 ± 0.2 nm are the most active in the FT reaction (1 bar, 220 °C), and a narrow Co particle size distribution is clearly essential to arrive at the maximum activity. We have approached this requirement for maximum FT activity with an 18 wt.% Co/SiO₂ catalyst prepared via impregnation, drying and calcination in NO/He. The more narrow Co particle size distribution (4.6 ± 0.8 nm) in Co/SiO₂ led to an activity enhancement of ∼40% compared to Co/CNF (5.7 ± 1.4 nm), although some promoting effect of silica could not be excluded.

Original language	English
Pages (from-to)	146-152
Number of pages	7
Journal	Journal of Catalysis
Volume	270
Issue number	1
DOIs	https://doi.org/10.1016/j.jcat.2009.12.015
Publication status	Published - 22 Mar 2010

Keywords

Cobalt catalysts
Cobalt on silica
Fischer-Tropsch synthesis
NO calcination
Particle size distribution

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10.1016/j.jcat.2009.12.015

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title = "Design of supported cobalt catalysts with maximum activity for the Fischer-Tropsch synthesis",

abstract = "The role of the cobalt particle size distribution in the Fischer-Tropsch (FT) reaction for supported Co catalysts was investigated. Using TEM histogram analyses and activity measurements of carbon nanofiber-supported catalysts, the TOF of discrete Co particle sizes was calculated. It was found that cobalt particles of 4.7 ± 0.2 nm are the most active in the FT reaction (1 bar, 220 °C), and a narrow Co particle size distribution is clearly essential to arrive at the maximum activity. We have approached this requirement for maximum FT activity with an 18 wt.% Co/SiO2 catalyst prepared via impregnation, drying and calcination in NO/He. The more narrow Co particle size distribution (4.6 ± 0.8 nm) in Co/SiO2 led to an activity enhancement of ∼40% compared to Co/CNF (5.7 ± 1.4 nm), although some promoting effect of silica could not be excluded.",

keywords = "Cobalt catalysts, Cobalt on silica, Fischer-Tropsch synthesis, NO calcination, Particle size distribution",

author = "{den Breejen}, {Johan P.} and Sietsma, {Jelle R.A.} and Heiner Friedrich and Bitter, {Johannes H.} and {de Jong}, {Krijn P.}",

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AU - den Breejen, Johan P.

AU - Sietsma, Jelle R.A.

AU - Friedrich, Heiner

AU - Bitter, Johannes H.

AU - de Jong, Krijn P.

PY - 2010/3/22

Y1 - 2010/3/22

N2 - The role of the cobalt particle size distribution in the Fischer-Tropsch (FT) reaction for supported Co catalysts was investigated. Using TEM histogram analyses and activity measurements of carbon nanofiber-supported catalysts, the TOF of discrete Co particle sizes was calculated. It was found that cobalt particles of 4.7 ± 0.2 nm are the most active in the FT reaction (1 bar, 220 °C), and a narrow Co particle size distribution is clearly essential to arrive at the maximum activity. We have approached this requirement for maximum FT activity with an 18 wt.% Co/SiO2 catalyst prepared via impregnation, drying and calcination in NO/He. The more narrow Co particle size distribution (4.6 ± 0.8 nm) in Co/SiO2 led to an activity enhancement of ∼40% compared to Co/CNF (5.7 ± 1.4 nm), although some promoting effect of silica could not be excluded.

AB - The role of the cobalt particle size distribution in the Fischer-Tropsch (FT) reaction for supported Co catalysts was investigated. Using TEM histogram analyses and activity measurements of carbon nanofiber-supported catalysts, the TOF of discrete Co particle sizes was calculated. It was found that cobalt particles of 4.7 ± 0.2 nm are the most active in the FT reaction (1 bar, 220 °C), and a narrow Co particle size distribution is clearly essential to arrive at the maximum activity. We have approached this requirement for maximum FT activity with an 18 wt.% Co/SiO2 catalyst prepared via impregnation, drying and calcination in NO/He. The more narrow Co particle size distribution (4.6 ± 0.8 nm) in Co/SiO2 led to an activity enhancement of ∼40% compared to Co/CNF (5.7 ± 1.4 nm), although some promoting effect of silica could not be excluded.

KW - Cobalt catalysts

KW - Cobalt on silica

KW - Fischer-Tropsch synthesis

KW - NO calcination

KW - Particle size distribution

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SP - 146

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JO - Journal of Catalysis

JF - Journal of Catalysis

IS - 1

ER -

Design of supported cobalt catalysts with maximum activity for the Fischer-Tropsch synthesis

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Keywords

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