Fischer-Tropsch synthesis over carbon-encapsulated cobalt and iron nanoparticles embedded in 3D-framework of carbon nanotubes

Chernyak, S. A.; Иванов, А. С.; Максимов, С. В.; Maslakov, K. I.; Isaikina, O. Ya.; Чернавский, П. А.; Kazantsev, Ruslan V.; Елисеев, О. Л.; Savilov, S. V.

doi:10.1016/j.jcat.2020.06.011

Cited by 30 publications

(21 citation statements)

References 89 publications

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“…Unfortunately, this pathway is a two-step process and energy intensive, where carbon monoxide (CO) must be formed through utilization of the water−gas shift reaction and then reacted with hydrogen (H 2 ) gas at high temperatures and pressures to get final usable products. 9,10 Therefore, there is an urgent need to revolutionize and update the energy industry, and this update could come from the electrochemical CO 2 RR to form value-added fuels and chemicals. The primary work that originally introduced CO 2 RR to the world was done by Hori in the 1980s, where he exhibited the capabilities of different pure metal catalysts to reduce CO 2 , which opened the door for large amounts of research to be conducted on CO 2 RR.…”

Section: Introductionmentioning

confidence: 99%

“…According to an assessment by the U.S. Energy Information Administration, unless the current energy structure is changed, CO 2 levels in the atmosphere will continue to increase. , On the industrial scale, currently the Fischer–Tropsch synthesis pathway is the main process of producing carbonaceous feedstock chemicals. Unfortunately, this pathway is a two-step process and energy intensive, where carbon monoxide (CO) must be formed through utilization of the water–gas shift reaction and then reacted with hydrogen (H 2 ) gas at high temperatures and pressures to get final usable products. , Therefore, there is an urgent need to revolutionize and update the energy industry, and this update could come from the electrochemical CO 2 RR to form value-added fuels and chemicals.…”

Section: Introductionmentioning

confidence: 99%

“…This positive feedback is then plotted against position to generate a substrate reactivity map over the surface. 1,9 Other modes of operation for SECM include tip generation/substrate collection (TG/SC), substrate generation/tip collection (SG/TC), and penetration and ion transfer feedback. 192−194 Sreekanth and Phani used SECM on an Au substrate during the CO 2 RR to analyze what conditions lead to specific product formation.…”

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confidence: 99%

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Progress and Challenges of Carbon Dioxide Reduction Reaction on Transition Metal Based Electrocatalysts

Johnson

Qiao

Djire

2021

ACS Appl. Energy Mater.

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Carbon dioxide (CO 2 ) is one of the main causes of global warming, with the burning of fossil fuels being the main source of anthropogenic CO 2 . For this reason, the capture and reduction of CO 2 to value-added chemicals powered by renewable energy sources is on the forefront of electrocatalyst and photocatalyst research. The choice of catalyst, support structure, and electrolyte are the main factors that impact the electrochemical CO 2 reduction reaction (CO 2 RR) to value-added chemicals and fuels. Therefore, an understanding of each of these factors must be gained prior to large-scale applications. In this review, we provide an overview on the field of CO 2 RR electrocatalysis based on nonprecious transition metal based catalysts with a focus on their design, synthesis, characterization, and mechanisms of CO 2 RR. Special attention is paid to advanced catalysts design incorporating two-dimensional (2D) transition metal carbide and nitride materials, and state-of-the-art in situ/operando spectroelectrochemical techniques. Lastly, remaining grand challenges in the field and outlooks for future research and opportunities are provided.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Progress and Challenges of Carbon Dioxide Reduction Reaction on Transition Metal Based Electrocatalysts

Johnson

Qiao

Djire

2021

ACS Appl. Energy Mater.

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“…Different CNMs were consolidated by SPS [ 26 , 27 , 28 ]. Consolidated CNMs can be used as adsorbents [ 29 ], biocompatible materials [ 30 ], catalysts, catalysts supports [ 31 ] and electrodes in energy storage devices [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Conversion of Secondary C3-C4 Aliphatic Alcohols on Carbon Nanotubes Consolidated by Spark Plasma Sintering

et al. 2021

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We analyze how the changes in the dimension of carbon nanomaterial (CNM) affect their catalytic conversion of secondary aliphatic alcohols. Carbon nanotubes (CNTs) consolidated by spark plasma sintering (SPS) were inactive in the conversion of secondary C3-C4 aliphatic alcohols because of the «healing» of defects in carbon structure during SPS. Gas-phase treatment of consolidated CNTs with HNO3 vapors led to their surface oxidation without destruction of the bulk structure of pellets. The oxygen content in consolidated CNTs determined by X-ray photoelectron spectroscopy increased from 11.3 to 14.9 at. % with increasing the oxidation time from 3 to 6 h. Despite the decrease in the specific surface area, the oxidized samples showed enhanced catalytic activity in alcohol conversion because of the increased number of oxygen radicals with unpaired electrons, which was established by electron paramagnetic resonance spectroscopy. We conclude that the structure of CNM determines the content and/or ratio of sp2 and sp3-hybridized carbon atoms in the material. The experimental and literature data demonstrated that sp3-hybridized carbon atoms on the surface are probably the preferable site for catalytic conversion of alcohols.

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“…To eliminate metal‐support strong interaction and to facilitate carbides formation, various carbonaceous supports for iron catalysts such as graphite, porous carbon, activated carbons, carbon nanotubes, and nanofibers have been proposed. [ 23–26 ] Although there are some advantages in these supports, their drawbacks are poor mechanical strength and often unacceptably high cost. To overcome these shortages, modification of standard oxide supports by coating its surface with carbon shell have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal₂o₄ Fischer–Tropsch Catalyst

et al. 2020

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Carbonization of MgAl2O4 spinel via glucose treatment is applied for preparation of spinel‐supported iron Fischer–Tropsch synthesis (FTS) catalysts. The catalysts are characterized by low‐temperature adsorption of N2, transmission electron microscopy (TEM), Mössbauer spectroscopy, in situ magnitometry, and are tested in high‐temperature FTS conditions. Surface carbonization leads to magnetite formation in the course of catalyst calcining, likely due to reductive function of surface carbon. In contrast, hematite is formed if iron precursor is deposited on pristine spinel. Support carbonization facilitates iron precursor reduction into carbide during catalyst activation step in synthesis gas flow and gives rise to highly dispersed iron nanopartilcles. Comparison of sequential and co‐impregnation approaches for support carbonization reveal that the first is preferable in terms of Hägg carbide formation during catalyst activation. Specific activity of the catalysts in high‐temperature FTS is approximately doubled due to the support carbonization. The carbonization also boosts C5+ selectivity and olefin percentage in the product hydrocarbons, while methane formation is suppressed. Adding potassium to catalyst formulation suppresses iron carbide oxidation and Fe3O4 formation, and promotes conversion of χ‐Fe5C2 into θ‐Fe7C3 in FTS conditions.

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Fischer-Tropsch synthesis over carbon-encapsulated cobalt and iron nanoparticles embedded in 3D-framework of carbon nanotubes

Cited by 30 publications

References 89 publications

Progress and Challenges of Carbon Dioxide Reduction Reaction on Transition Metal Based Electrocatalysts

Progress and Challenges of Carbon Dioxide Reduction Reaction on Transition Metal Based Electrocatalysts

Conversion of Secondary C3-C4 Aliphatic Alcohols on Carbon Nanotubes Consolidated by Spark Plasma Sintering

Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal₂o₄ Fischer–Tropsch Catalyst

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Fischer-Tropsch synthesis over carbon-encapsulated cobalt and iron nanoparticles embedded in 3D-framework of carbon nanotubes

Cited by 30 publications

References 89 publications

Progress and Challenges of Carbon Dioxide Reduction Reaction on Transition Metal Based Electrocatalysts

Progress and Challenges of Carbon Dioxide Reduction Reaction on Transition Metal Based Electrocatalysts

Conversion of Secondary C3-C4 Aliphatic Alcohols on Carbon Nanotubes Consolidated by Spark Plasma Sintering

Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal2o4 Fischer–Tropsch Catalyst

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Product

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Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal₂o₄ Fischer–Tropsch Catalyst