Ostwald ripening on a planar Co/SiO2 catalyst exposed to model Fischer-Tropsch synthesis conditions

D. Kistamurthy; A.M. Saib; D.J. Moodley; J.W. Niemantsverdriet; C.J. Weststrate

doi:10.1016/j.jcat.2015.02.017

Ostwald ripening on a planar Co/SiO2 catalyst exposed to model Fischer-Tropsch synthesis conditions

D. Kistamurthy, A.M. Saib, D.J. Moodley, J.W. Niemantsverdriet, C.J. Weststrate

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

50 Citations (Scopus)

Abstract

Catalyst deactivation is an important topic for industrial catalyst development. Sintering of small cobalt crystallites is one of the deactivation mechanisms of cobalt-based Fischer–Tropsch synthesis (FTS) catalysts. This study investigates the mechanism of cobalt sintering at low-conversion FTS conditions. A Co/SiO2/Si(1 0 0) model catalyst is exposed to 20 bar dry synthesis gas (H2/CO: 2/1) at 230 °C for 10 h. Cobalt nanoparticles were characterized before and after treatment using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). TEM images of identical locations on the model catalyst showed a loss of some small crystallites and decrease in size of some crystallites. Sintering is dominated by an Ostwald ripening mechanism using our model catalyst under the present conditions. Complementary XPS measurements confirm the loss of Co dispersion. Therefore, the loss of small Co nanoparticles causes a rapid loss of metal surface area when exposed to model FTS conditions

Original language	English
Pages (from-to)	123-129
Journal	Journal of Catalysis
Volume	328
DOIs	https://doi.org/10.1016/j.jcat.2015.02.017
Publication status	Published - Aug 2015

Keywords

Fischer-Tropsch synthesis
Deactivation
Cobalt catalyst
Co/SiO2/Si(100)
Sintering
Ostwald ripening
Transmission electron microscopy

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@article{21052060622047f586da301a8e33f40a,

title = "Ostwald ripening on a planar Co/SiO2 catalyst exposed to model Fischer-Tropsch synthesis conditions",

abstract = "Catalyst deactivation is an important topic for industrial catalyst development. Sintering of small cobalt crystallites is one of the deactivation mechanisms of cobalt-based Fischer–Tropsch synthesis (FTS) catalysts. This study investigates the mechanism of cobalt sintering at low-conversion FTS conditions. A Co/SiO2/Si(1 0 0) model catalyst is exposed to 20 bar dry synthesis gas (H2/CO: 2/1) at 230 °C for 10 h. Cobalt nanoparticles were characterized before and after treatment using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). TEM images of identical locations on the model catalyst showed a loss of some small crystallites and decrease in size of some crystallites. Sintering is dominated by an Ostwald ripening mechanism using our model catalyst under the present conditions. Complementary XPS measurements confirm the loss of Co dispersion. Therefore, the loss of small Co nanoparticles causes a rapid loss of metal surface area when exposed to model FTS conditions",

keywords = "Fischer-Tropsch synthesis, Deactivation, Cobalt catalyst, Co/SiO2/Si(100), Sintering, Ostwald ripening, Transmission electron microscopy",

author = "D. Kistamurthy and A.M. Saib and D.J. Moodley and J.W. Niemantsverdriet and C.J. Weststrate",

year = "2015",

month = aug,

doi = "10.1016/j.jcat.2015.02.017",

language = "English",

volume = "328",

pages = "123--129",

journal = "Journal of Catalysis",

issn = "0021-9517",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Ostwald ripening on a planar Co/SiO2 catalyst exposed to model Fischer-Tropsch synthesis conditions

AU - Kistamurthy, D.

AU - Saib, A.M.

AU - Moodley, D.J.

AU - Niemantsverdriet, J.W.

AU - Weststrate, C.J.

PY - 2015/8

Y1 - 2015/8

N2 - Catalyst deactivation is an important topic for industrial catalyst development. Sintering of small cobalt crystallites is one of the deactivation mechanisms of cobalt-based Fischer–Tropsch synthesis (FTS) catalysts. This study investigates the mechanism of cobalt sintering at low-conversion FTS conditions. A Co/SiO2/Si(1 0 0) model catalyst is exposed to 20 bar dry synthesis gas (H2/CO: 2/1) at 230 °C for 10 h. Cobalt nanoparticles were characterized before and after treatment using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). TEM images of identical locations on the model catalyst showed a loss of some small crystallites and decrease in size of some crystallites. Sintering is dominated by an Ostwald ripening mechanism using our model catalyst under the present conditions. Complementary XPS measurements confirm the loss of Co dispersion. Therefore, the loss of small Co nanoparticles causes a rapid loss of metal surface area when exposed to model FTS conditions

AB - Catalyst deactivation is an important topic for industrial catalyst development. Sintering of small cobalt crystallites is one of the deactivation mechanisms of cobalt-based Fischer–Tropsch synthesis (FTS) catalysts. This study investigates the mechanism of cobalt sintering at low-conversion FTS conditions. A Co/SiO2/Si(1 0 0) model catalyst is exposed to 20 bar dry synthesis gas (H2/CO: 2/1) at 230 °C for 10 h. Cobalt nanoparticles were characterized before and after treatment using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). TEM images of identical locations on the model catalyst showed a loss of some small crystallites and decrease in size of some crystallites. Sintering is dominated by an Ostwald ripening mechanism using our model catalyst under the present conditions. Complementary XPS measurements confirm the loss of Co dispersion. Therefore, the loss of small Co nanoparticles causes a rapid loss of metal surface area when exposed to model FTS conditions

KW - Fischer-Tropsch synthesis

KW - Deactivation

KW - Cobalt catalyst

KW - Co/SiO2/Si(100)

KW - Sintering

KW - Ostwald ripening

KW - Transmission electron microscopy

U2 - 10.1016/j.jcat.2015.02.017

DO - 10.1016/j.jcat.2015.02.017

M3 - Article

VL - 328

SP - 123

EP - 129

JO - Journal of Catalysis

JF - Journal of Catalysis

SN - 0021-9517

ER -

Ostwald ripening on a planar Co/SiO2 catalyst exposed to model Fischer-Tropsch synthesis conditions

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Keywords

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