Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

Чернавский, П. А.; Kazantsev, Ruslan V.; Панкина, Г. В.; Maslakov, K. I.; Лунин, Б. С.; Елисеев, О. Л.

doi:10.1002/ente.201800961

Cited by 7 publications

(6 citation statements)

References 50 publications

(47 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They [15] ascribed this to the presence of defects in magnetite, which lower the activation energy from 88 to 39 kJ/mol when it is being reduced to iron. Chenavskii et al's [96] observation shows that under syngas reduction, Hägg carbide is formed at 400 °C. A study carried out by Li et al [97] to determine the effect of reducing agents on iron-based MOF catalysts for use in FTS, revealed that using iron catalysts reduced in H 2 resulted in the formation of elemental iron, while Fe 3 C was produced from syngas, and a large portion of Fe 3 O 4 was obtained from H 2 reduction.…”

Section: Active Phases Of Iron-based Catalysts In Ftsmentioning

confidence: 99%

Section: The Role Of Promoters On Iron-based Catalysts During Auto-re...mentioning

confidence: 99%

“…Chenavskii et al [96] showed that potassium promoters affect the reducibility and carburization behaviour of iron. From their previous work [96], it was concluded that potassium aids in the formation of iron carbides. As much as potassium facilitated the formation of carbides, the researchers [96] observed that the promoter particles instigated aggregation of the iron carbides during activation under a syngas or CO atmosphere.…”

Section: The Role Of Promoters On Iron-based Catalysts During Auto-re...mentioning

confidence: 99%

See 2 more Smart Citations

A Review of the Use of Carbon Nanostructures and Other Reducing Agents During Auto-reduction for Fischer–Tropsch Synthesis and Other Applications

Ncube

Moyo

2023

Catal Lett

View full text Add to dashboard Cite

Fischer–Tropsch Synthesis (FTS) is an important process in the production of liquid fuels in the energy sector, due to its flexibility for use with other technologies that can produce carbon monoxide (CO) and hydrogen. Catalysts have found substantial use in FTS to improve the process efficiency. However, the use of conventional FTS catalyst reduction techniques using (hydrogen (H2), CO and syngas) to activate the metal precursor has been accompanied by strong metal-support interactions. Such limitations have driven the quest for better technologies to ensure FTS catalysis reaches its full capacity. In this article, we review the activation techniques used, with emphasis on the contemporary auto-reduction technique, which has revealed energy-saving merits. Auto-reduction has the advantage of reducing the number of steps involved in catalyst preparation prior to FTS as well as eliminating costly reducing agents such as H2, CO and syngas. Auto-reduction in this article refers to the reduction of the metal precursor using a carbon support. We firstly provide a comprehensive review of the traditional reducing agents, followed by a review of the contemporary auto-reduction technique. A comparison of the conventional FTS catalyst reduction and auto-reduction techniques is provided to allow for a fundamental understanding of the merits and demerits of both techniques. The different types of nanostructured carbon materials used in aiding auto-reduction for the FTS process are reviewed. Graphical Abstract

show abstract

Section: Active Phases Of Iron-based Catalysts In Ftsmentioning

confidence: 99%

Section: The Role Of Promoters On Iron-based Catalysts During Auto-re...mentioning

confidence: 99%

Section: The Role Of Promoters On Iron-based Catalysts During Auto-re...mentioning

confidence: 99%

See 1 more Smart Citation

A Review of the Use of Carbon Nanostructures and Other Reducing Agents During Auto-reduction for Fischer–Tropsch Synthesis and Other Applications

Ncube

Moyo

2023

Catal Lett

View full text Add to dashboard Cite

show abstract

“…Two other studies from 2019 utilizing this new version of the earthicle focused on the analysis of the pros and cons of distributing the particles to the cells as powders or as colloidally stable ferrofluids 321 and on the ability of the ferrofluids to act as a material for targeted magnetic separation of cancer cells, bacteria, and specific types of biomolecules. 322 Furthermore, while the doubly shelled iron (oxide) particles conforming to the composition of the earthicle are yet to be studied thoroughly for their catalytic properties, a study from 2019, demonstrating a beneficial effect of carbon−silica composite support on the catalytic activity of iron in CO hydrogenation of the Fischer−Tropsch type while suppressing the formation of methane and increasing Anderson−Schulz− Flory distribution chain growth parameter, 323 hints at the immense potential of these materials for such applications. Another hint at things that are yet to come comes from another study from 2019, in which case a composite formed by embedding metallic iron particles inside a silica matrix and subsequently carbonizing the latter exhibited an excellent cyclic stability and rate capability, enhanced diffusion coefficient for lithium ions, and low transfer resistance when tested as a potential anode for lithium-ion batteries.…”

Section: Triphasic Compositions Comprising Iron (Oxides) Silica and C...mentioning

confidence: 99%

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

Uskoković

2020

ACS Earth Space Chem.

View full text Add to dashboard Cite

Earthicle was conceived as an astromimetic particle mimicking the stratified structure of Earth. Although earthicle can come in various compositional and structural forms, its seminal version consisted of a spherical nanoparticle with an iron core, a silica shell, and a carbon crust. This study provides a historical review of composite, core/shell particles composed of four different combinations of phases present in this original version of the earthicle, three of which are biphasic and one of which is triphasic: iron(oxide)/silica, iron(oxide)/carbon, silica/carbon, and iron(oxide)/silica/carbon. The connection of all four types of particles to materials of astrophysical origin found in interstellar and interplanetary space is discussed. The referred studies on the three biphasic compositions were selected on the basis of their conceptual and methodological innovativeness or originality in terms of the analytical data. In contrast, all studies that have reported so far on the synthesis, characterization, or application of the hybrid particles with the triphasic composition, along with a number of related studies, are reviewed. The chronological perspective adopted for both types of hybrid compositions, biphasic and triphasic, allowed for the deduction of past and present trends in the research of these composite systems but also for the extrapolation of probable future trends. For example, the interest in silica-coated iron (oxides) has been greater than that in other three core/shell systems, especially in biomedical studies, one reason being the difference in reactivity and in the favored oxidation state of the magnetic core under silica and under carbon. The early focus of research on silica-coated iron (oxides) was mostly on controlling the synthesis process, but as of the early 2000s the interest in controlling the properties and devising new applications for these systems became dominant among the scientific community. Carbon-coated silica particles have been the least studied and have had the least impact among the three biphasic combinations reviewed, especially in the biomedical field where their research has been virtually none. Revived briefly around 2010, the interest in them wound down soon thereafter in favor of more complex compositions. Still, the most complex hybrid composition reviewed here, comprising iron (oxide) particles shelled doubly, first with silica and then with carbon, was the least studied of all four multiphasic compositions elaborated here. However, unlike the ups and downs in the research on the biphasic compositions in the particulate form, the corresponding interest in these triphasic particles has been continually increasing, in spite of the comparatively low number of literature reports on them. This promising trend emerging from the literature search may go hand-in-hand with the ongoing global tendency to fabricate complex composite particle structures in search of novel properties arising from the sometimes theoretically predictable and sometimes serendipitous synergies be...

show abstract

“…Then iron and optionally potassium as an electronic promoter are introduced by incipient wetness impregnation (IWI). [ 28 ]…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

Cited by 7 publications

References 50 publications

A Review of the Use of Carbon Nanostructures and Other Reducing Agents During Auto-reduction for Fischer–Tropsch Synthesis and Other Applications

A Review of the Use of Carbon Nanostructures and Other Reducing Agents During Auto-reduction for Fischer–Tropsch Synthesis and Other Applications

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

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

Contact Info

Product

Resources

About

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

Cited by 7 publications

References 50 publications

A Review of the Use of Carbon Nanostructures and Other Reducing Agents During Auto-reduction for Fischer–Tropsch Synthesis and Other Applications

A Review of the Use of Carbon Nanostructures and Other Reducing Agents During Auto-reduction for Fischer–Tropsch Synthesis and Other Applications

Earthicle and Its Discontents: A Historical Critical Review of Iron (Oxide) Particles Singly and Doubly Shelled with Silica and/or Carbon

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

Contact Info

Product

Resources

About

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