Role of CoO-Co nanoparticles supported on SiO2 in Fischer-Tropsch synthesis: Evidence for enhanced CO dissociation and olefin hydrogenation

Shiba, Nothando C.; Yao, Yali; Forbes, Roy P.; Okoye-Chine, Chike George; Liu, Xinying; Hildebrandt, Diane

doi:10.1016/j.fuproc.2021.106781

Cited by 13 publications

(11 citation statements)

References 21 publications

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“…The SiO 2 -supported catalyst showed higher reaction rates at 250 • C compared to 350 • C (see Figure 4B). Our previous work over the SiO 2 sample demonstrated the effect of Co-CoO bonding promoting the FT reaction, thus leading to a higher FT reaction rate at a lower reduction temperature (250 • C), when the CoO density is higher than the density observed at 350 • C [27].…”

Section: Discussionmentioning

confidence: 94%

“…The SiO2-supported catalyst showed higher reaction rates at 250 °C compared to 350 °C (see Figure 4B). Our previous work over the SiO2 sample demonstrated the effect of Co-CoO bonding promoting the FT reaction, thus leading to a higher FT reaction rate at a lower reduction temperature (250 °C), when the CoO density is higher than the density observed at 350 °C [27]. rate followed by Co/SiO2 and then Co/Al2O3, at all reduction temperatur Another observation is that the CH4 formation rate was higher for the syn ples at 350 °C, whereas for the H2-treated samples, higher CH4 formatio served at 250 °C, except for the catalyst supported on SiO2.…”

Section: Reaction Ratementioning

confidence: 97%

“…It shows that the Al 2 O 3 -supported catalyst had a larger pore size and a larger particle size than the catalysts supported on TiO 2 and SiO 2 . For further details on the catalyst physical properties, please refer to our previous publications [27].…”

Section: Characteristicsmentioning

confidence: 99%

“…The high surface area of SiO 2 -support and the lower metal-support interaction enhanced the reducibility and the dispersion of the metal. Our previous research [27] reported that the oxidised Co/SiO 2 catalyst, in H 2 at 250 • C, formed a multiphase of CoO-Co/SiO 2 , and this CoO-Co interface promoted the CO dissociation and secondary olefin hydrogenation reactions, thus leading to a higher FT reaction rate [27].…”

Section: Product Selectivitymentioning

confidence: 99%

“…For example, Jacobs et al [11] reported a lower degree of reduction for Al 2 O 3 -and TiO 2 -supported catalysts due to high metal-support interactions compared to the SiO 2 -support. Strong metal-metal oxide interactions have been demonstrated to play an important role in the 3 h and calcination at 350 • C for 8 h. For, the detailed preparation procedure, please refer to our earlier publication [27].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pre-Treatment Conditions on the Activity and Selectivity of Cobalt-Based Catalysts for CO Hydrogenation

et al. 2021

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We investigated the effect of pre-treatment conditions on the activity and selectivity of cobalt catalysts for Fischer–Tropsch synthesis (FTS) by varying both the reduction atmosphere and the reduction temperature. Catalysts supported on SiO2, Al2O3, and TiO2, prepared via incipient wetness impregnation, were evaluated, and activation temperatures in the range 250–350 °C were considered. Activation with syngas led to a better product selectivity (low CH4, high selectivity to liquid hydrocarbons, and low paraffin to olefin ratio (P/O)) than the catalysts reduced in H2 at lower activation temperatures. The CoxC species suppressed the hydrogenation reaction, and it is hypothesised that this resulted in the high selectivity of olefins observed for the syngas pre-treated catalysts. On the basis of the experimental results, we postulated that a synergistic effect between Co0 and CoxC promotes the production of the long chain hydrocarbons and suppresses the formation of CH4. In addition, for systems aimed at producing lower olefins, syngas activation is recommended, and for the FTS plants that focus on maximising the production of higher molecular weight products, H2 activation might be considered. These results provide insights for the future FTS catalyst design and for target product-driven operations.

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Section: Discussionmentioning

confidence: 94%

Section: Reaction Ratementioning

confidence: 97%

Section: Characteristicsmentioning

confidence: 99%

Section: Product Selectivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Pre-Treatment Conditions on the Activity and Selectivity of Cobalt-Based Catalysts for CO Hydrogenation

et al. 2021

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Tunable CO Dissociation Assisted by H₂ over Cobalt Species: A Mechanistic Study by In‐situ DRIFTS

et al. 2021

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Fischer‐Tropsch synthesis (FTS) is an important heterogeneous catalytic process that can effectively reduce human dependence on the non‐renewable petroleum resources. Cobalt is a crucial active metal center in most catalysts, which effectively catalyzes syngas into valuable products such as liquid fuels. On this basis, we systematically investigated the adsorption of CO on the surface of different cobalt species and its dissociation characteristics assisted by H2 are studied by the in‐situ DRIFTS. For the metallic cobalt phase, H2‐assisted CO dissociation not only possessed the FTS activity, but also inhibited the CO disproportionation reaction. However, for the CoO phase, the bidentate carbonate species were decomposed into CO2. In addition, CoO presented a high‐chain propagation ability than that of Co under the same operation conditions. Co2O3 and Co3O4 also exhibited similar CO dissociation patterns with the assistance of H2. However, different from CoO phase, formate species also formed under the H2 atmosphere over these two Co species. In summary, CO dissociation would be well tuned via the assistance of H2 as demonstrated by the in‐situ DRIFTS. This work provides a new sight on the rational design of efficient cobalt catalysts toward the FTS processes.

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Synthesis strategies of carbon nanotube supported and confined catalysts for thermal catalysis

Lin

Cao

et al. 2022

Chemical Engineering Journal

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Role of CoO-Co nanoparticles supported on SiO2 in Fischer-Tropsch synthesis: Evidence for enhanced CO dissociation and olefin hydrogenation

Cited by 13 publications

References 21 publications

Effect of Pre-Treatment Conditions on the Activity and Selectivity of Cobalt-Based Catalysts for CO Hydrogenation

Effect of Pre-Treatment Conditions on the Activity and Selectivity of Cobalt-Based Catalysts for CO Hydrogenation

Tunable CO Dissociation Assisted by H₂ over Cobalt Species: A Mechanistic Study by In‐situ DRIFTS

Synthesis strategies of carbon nanotube supported and confined catalysts for thermal catalysis

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Role of CoO-Co nanoparticles supported on SiO2 in Fischer-Tropsch synthesis: Evidence for enhanced CO dissociation and olefin hydrogenation

Cited by 13 publications

References 21 publications

Effect of Pre-Treatment Conditions on the Activity and Selectivity of Cobalt-Based Catalysts for CO Hydrogenation

Effect of Pre-Treatment Conditions on the Activity and Selectivity of Cobalt-Based Catalysts for CO Hydrogenation

Tunable CO Dissociation Assisted by H2 over Cobalt Species: A Mechanistic Study by In‐situ DRIFTS

Synthesis strategies of carbon nanotube supported and confined catalysts for thermal catalysis

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Tunable CO Dissociation Assisted by H₂ over Cobalt Species: A Mechanistic Study by In‐situ DRIFTS