Study of the oxide/carbide transition on iron surfaces during catalytic coke formation

Bonnet, Fanny; Ropital, F.; Lecour, Philippe; Espinat, D.; Huiban, Y.; Gengembre, L.; Berthier, Yves; Marcus, Philippe

doi:10.1002/sia.1330

Cited by 94 publications

(55 citation statements)

References 13 publications

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“…F. Bonnet et al 15) studied the iron oxides conversion into Fe3C by thermogravimetry in an iso-C4H10-H2-Ar mixture with aC = 6 710 at 873 K. Fe3O4 is rapidly converted into Fe3C and they confirmed that metallic Fe is not an intermediary species from XPS spectra analysis. Shroff et al 18) said that magnetite transforms into carbide based on high resolution TEM observation.…”

Section: Introductionmentioning

confidence: 93%

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Cementite Formation from Magnetite under High Pressure Conditions

2013

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Measurements have been made of the rate of Fe3C formation from Fe3O4 powder and Fe3O4 single crystals at 773 K and 1 023 K under the high pressure of 0.5 and 1.0 MPa by using thermo-gravimetric method. Along with the kinetic study of Fe3C formation, high resolution TEM observation around the interface between Fe3O4 matrix and the formed Fe3C have been carried out to confirm the thermodynamically possible direct Fe3C formation from Fe3O4 without the formation of intermediate metallic Fe. Analysis of the rate results suggests that the reaction mechanism of Fe3C formation was possibly described by the sequential reactions of the conversion of Fe3O4 to Fe3C via intermediate metallic Fe although the metallic Fe existence was not confirmed by TEM observation. This inconsistency was explained by considering the relative reaction rates of Fe3C formation from Fe and Fe formation from Fe3O4. It was also found that not only the carbon activity of more than unity but also the low oxygen potential enough for metallic Fe existence might be required for the Fe3C formation.

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Section: Introductionmentioning

confidence: 93%

“…[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Despite of these many studies, the details of the reaction mechanism of Fe3C formation and its physical properties have not yet been established well. The reason for the lack in knowledge mainly comes from the metastability of the carbide causing experimental difficulties.…”

Section: Introductionmentioning

confidence: 99%

Cementite Formation from Magnetite under High Pressure Conditions

2013

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“…Nevertheless, we cannot exclude the presence of iron carbides. Cementite Fe 3 C is one of the most abundant Fe carbides and would exhibit a signal at ∼708.3 eV, which could interfere with the signals of Fe (III) (Shabanova and Trapeznikov 1975;Bonnet et al 2002). It is known, that Fe 3 C forms by CO 2 laser pyrolysis of Fe(CO) 5 and C 2 H 4 (Bi et al 1993).…”

Section: Analysis Of Electronic State Of Fe In Sootmentioning

confidence: 99%

Impact of Fe Content in Laboratory-Produced Soot Aerosol on its Composition, Structure, and Thermo-Chemical Properties

Bladt

Schmid

Kireeva

et al. 2012

Aerosol Science and Technology

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Soot aerosol, which is a major pollutant in the atmosphere of urban areas, often contains not only carbonaceous matter but also inorganic material. These species, for example, iron compounds, originated from impurities in fuel or lubricating oil, additives or engine wear may change the physico-chemical characteristics of soot and hence its environmental impact. We studied the change of composition, structure, and oxidation reactivity of laboratory-produced soot aerosol with varying iron content. Soot types of various iron contents were generated in a propane/air diffusion flame by adjusting the doping amount of iron pentacarbonyl Fe(CO) 5 to the flame. Scanning electron microscopy (SEM)/energy-dispersive Xray spectroscopy (EDX) was combined with cluster analysis (CA) to separate individual particles into definable groups of similar chemical composition representing the particle types in dependence of the iron content in soot. Raman microspectroscopy (RM) and infrared spectroscopy were applied for the characterization of the graphitic soot structure, hydrocarbons, and iron species. For the analysis of soot reactivity, temperature-programmed oxidation

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“…Many studies have been carried out for the Fe 3 C formation. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] It is reported by Satoh et al 2,3) and Gudenau et al 18) that Fe 3 C may enhance carburization and smelting of reduced iron. However, Fe 3 C is a metastable phase and it may decompose into Fe and C in blast furnace.…”

Section: Introductionmentioning

confidence: 94%

Decomposition Behavior of Fe3C under Ar Atmosphere

Miki

Ishii

2014

ISIJ Int.

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Suppression of CO2 discharged from iron and steelmaking companies is an example of the biggest issues for the protection of global environment and sustainable growth of steelmaking industry. One of the efforts made to decrease the emission of CO2 in ironmaking process is blowing of hydrogen gas into blast furnace. Hydrogen gas can reduce iron oxide and form harmless H2O. Cementite (Fe3C) may be formed by introduction of hydrogen into blast furnace and play an important role on carburization and smelting behavior of reduced iron.In the present work, Fe3C sample was held at 800-1 100 K under Ar atmosphere to clarify the stability and the behavior of Fe3C phase. It was confirmed that metastable Fe3C phase will decompose under Ar atmosphere at 800 K and rapidly decompose at temperature over 900 K. Also, it was found that composite of nano-size C and Fe will form when Fe3C decompose.

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Study of the oxide/carbide transition on iron surfaces during catalytic coke formation

Abstract: The thermodynamic equilibria between metallic iron, iron oxides, iron carbides and a hydrocarbon/hydrogen mixture were calculated at 600•

Cited by 94 publications

References 13 publications

Cementite Formation from Magnetite under High Pressure Conditions

Cementite Formation from Magnetite under High Pressure Conditions

Impact of Fe Content in Laboratory-Produced Soot Aerosol on its Composition, Structure, and Thermo-Chemical Properties

Decomposition Behavior of Fe3C under Ar Atmosphere

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