Structure-performance relationships on Co based Fischer – Tropsch synthesis catalysts: The more defect free the better

Nikolaos E. Tsakoumis*, Eleni Patanou, Sara Lögdberg, Rune E. Johnsen, Rune Myrstad, Wouter van Beek, Erling Rytter, Edd A. Blekkan

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Understanding and utilizing structure-performance relationships in catalytic nanomaterials is the epitome of catalysis science. Knowledge at the atomic level can potentially allow rational design of more selective and energy efficient catalytic materials. Fischer – Tropsch synthesis on cobalt is an example of a complicated system that operates in a narrow process regime, and the nature of the reaction product is governed by numerous parameters. On an industrial model catalyst, we have simplified the structure of the active, metallic nanoparticles into predominantly hexagonal close packed structure via the use of a Co2C precursor. By varying the final reduction temperature, we could mildly modify catalyst microstructural properties at the nanoparticle (NP) level. Catalytic materials, although with minimal structural differences, showed significantly different performance. Evidently there is a narrow window for complete utilization of the hexagonal close packed Co crystallites that lays between removal of lattice carbon, that remains from the Co2C precursor, and the initiation of stacking disorder, due to transition to the face centered cubic Co structure. Fischer – Tropsch synthesis performance indicators show that Co NPs with minimum number of crystal defects outperform catalysts with lattice defects, either due to the existence of lattice carbon or stacking faults. Therefore, catalyst preparation and activation procedures probably should be designed targeting defect free Co crystallites.
Original languageEnglish
JournalACS Catalysis
Volume9
Pages (from-to)511-520
ISSN2155-5435
DOIs
Publication statusPublished - 2019

Keywords

  • Fischer–Tropsch synthesis
  • Cobalt
  • hcp
  • fcc
  • structure-performance relationships
  • stacking faults
  • lattice carbon
  • H2 coverage

Cite this

Tsakoumis, N. E., Patanou, E., Lögdberg, S., Johnsen, R. E., Myrstad, R., van Beek, W., ... Blekkan, E. A. (2019). Structure-performance relationships on Co based Fischer – Tropsch synthesis catalysts: The more defect free the better. ACS Catalysis, 9, 511-520. https://doi.org/10.1021/acscatal.8b03549
Tsakoumis, Nikolaos E. ; Patanou, Eleni ; Lögdberg, Sara ; Johnsen, Rune E. ; Myrstad, Rune ; van Beek, Wouter ; Rytter, Erling ; Blekkan, Edd A. / Structure-performance relationships on Co based Fischer – Tropsch synthesis catalysts: The more defect free the better. In: ACS Catalysis. 2019 ; Vol. 9. pp. 511-520.
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abstract = "Understanding and utilizing structure-performance relationships in catalytic nanomaterials is the epitome of catalysis science. Knowledge at the atomic level can potentially allow rational design of more selective and energy efficient catalytic materials. Fischer – Tropsch synthesis on cobalt is an example of a complicated system that operates in a narrow process regime, and the nature of the reaction product is governed by numerous parameters. On an industrial model catalyst, we have simplified the structure of the active, metallic nanoparticles into predominantly hexagonal close packed structure via the use of a Co2C precursor. By varying the final reduction temperature, we could mildly modify catalyst microstructural properties at the nanoparticle (NP) level. Catalytic materials, although with minimal structural differences, showed significantly different performance. Evidently there is a narrow window for complete utilization of the hexagonal close packed Co crystallites that lays between removal of lattice carbon, that remains from the Co2C precursor, and the initiation of stacking disorder, due to transition to the face centered cubic Co structure. Fischer – Tropsch synthesis performance indicators show that Co NPs with minimum number of crystal defects outperform catalysts with lattice defects, either due to the existence of lattice carbon or stacking faults. Therefore, catalyst preparation and activation procedures probably should be designed targeting defect free Co crystallites.",
keywords = "Fischer–Tropsch synthesis, Cobalt, hcp, fcc, structure-performance relationships, stacking faults, lattice carbon, H2 coverage",
author = "Tsakoumis, {Nikolaos E.} and Eleni Patanou and Sara L{\"o}gdberg and Johnsen, {Rune E.} and Rune Myrstad and {van Beek}, Wouter and Erling Rytter and Blekkan, {Edd A.}",
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Tsakoumis, NE, Patanou, E, Lögdberg, S, Johnsen, RE, Myrstad, R, van Beek, W, Rytter, E & Blekkan, EA 2019, 'Structure-performance relationships on Co based Fischer – Tropsch synthesis catalysts: The more defect free the better', ACS Catalysis, vol. 9, pp. 511-520. https://doi.org/10.1021/acscatal.8b03549

Structure-performance relationships on Co based Fischer – Tropsch synthesis catalysts: The more defect free the better. / Tsakoumis, Nikolaos E.; Patanou, Eleni; Lögdberg, Sara; Johnsen, Rune E.; Myrstad, Rune; van Beek, Wouter; Rytter, Erling; Blekkan, Edd A.

In: ACS Catalysis, Vol. 9, 2019, p. 511-520.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Structure-performance relationships on Co based Fischer – Tropsch synthesis catalysts: The more defect free the better

AU - Tsakoumis, Nikolaos E.

AU - Patanou, Eleni

AU - Lögdberg, Sara

AU - Johnsen, Rune E.

AU - Myrstad, Rune

AU - van Beek, Wouter

AU - Rytter, Erling

AU - Blekkan, Edd A.

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AB - Understanding and utilizing structure-performance relationships in catalytic nanomaterials is the epitome of catalysis science. Knowledge at the atomic level can potentially allow rational design of more selective and energy efficient catalytic materials. Fischer – Tropsch synthesis on cobalt is an example of a complicated system that operates in a narrow process regime, and the nature of the reaction product is governed by numerous parameters. On an industrial model catalyst, we have simplified the structure of the active, metallic nanoparticles into predominantly hexagonal close packed structure via the use of a Co2C precursor. By varying the final reduction temperature, we could mildly modify catalyst microstructural properties at the nanoparticle (NP) level. Catalytic materials, although with minimal structural differences, showed significantly different performance. Evidently there is a narrow window for complete utilization of the hexagonal close packed Co crystallites that lays between removal of lattice carbon, that remains from the Co2C precursor, and the initiation of stacking disorder, due to transition to the face centered cubic Co structure. Fischer – Tropsch synthesis performance indicators show that Co NPs with minimum number of crystal defects outperform catalysts with lattice defects, either due to the existence of lattice carbon or stacking faults. Therefore, catalyst preparation and activation procedures probably should be designed targeting defect free Co crystallites.

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KW - structure-performance relationships

KW - stacking faults

KW - lattice carbon

KW - H2 coverage

U2 - 10.1021/acscatal.8b03549

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JF - A C S Catalysis

SN - 2155-5435

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