Preparation of iron powder by the thermal decomposition of iron pentacarbonyl

Syrkin, V. G.

doi:10.1007/bf00773954

Cited by 7 publications

(2 citation statements)

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“…To dope Au into the crystal structure of FeCo, one main synthetic parameter was adjusted: time of injection. In typical hot injection/thermal decomposition synthetic routes, Fe and Co organometallic precursors , typically in the form of carbonylsare added and allowed to mix under high temperature and then later a fatty acidOA in this caseis added to stabilize the particle and direct the morphological growth as is typically seen in nanoparticle syntheses. , Under this high temperature, the Fe and Co carbonyl compounds undergo thermal decomposition to begin forming Fe and Co nucleating points and eventually small FeCo clusters capped by the fatty acid and other surfactants to stabilize the monomers . However, because of the low standard reduction potentials of Fe 2+ /Fe (−0.45 V vs SHE) and Co 2+ /Co (−0.28 V vs SHE), this nucleation process and the reduction of the metals from carbonyl to cluster is limited by the slow reduction into monomers.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Magnetoplasmonic Air-Stable Au@FeCo

et al. 2023

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The synthesis of FeCo alloys as highly magnetic nanoparticles has been valuable, as far as applications for magnetic nanoparticles are concerned. However, recently, a field of magnetoplasmonics in which magnetic nanoparticles such as the FeCo alloys doped with plasmonic materials such as Au and Ag to create a hybrid nanostructure with both properties has emerged. These magnetoplasmonic metamaterials have greatly enhanced the limit of detection of analytes in spectroscopic methods, as well as providing a more widely applicable nanoparticle to broaden the use of FeCo alloys even further. Herein, we discuss the synthesis of high-yield and fairly monodisperse spherical FeCo and Au-doped FeCo (Au@FeCo) with varying compositions of Au synthesized via the thermal decomposition of iron pentacarbonyl (Fe(CO) 5 ) and dicobalt octacarbonyl (Co 2 (CO) 8 ), followed by the addition of Au atoms using triphenylphosphine gold(I) chloride ((Ph 3 P)AuCl) via both coprecipitation and by delayed addition methods. The products were separated using a hand-held magnet, and then characterized via ultraviolet−visible light (UV-vis), scanning electron microscopy coupled with energy-dispersive X-ray analysis (SEM-EDX), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), flame atomic absorption spectrometry (F-AAS), and magnetization measurements. Optical studies revealed a plasmonic peak at 550 nm in the Au@FeCo nanoparticles that had a gold content (%Au) of >2% (by weight), determined using F-AAS. Colocation of the Fe, Co, and Au were demonstrated through EDX analysis. Location of the Au atoms in the core were seen through high-resolution bright-field imaging. To understand the use of these nanoparticles for potential application in therapeutics and/or electronics, resistance measurements were performed to assess power loss as a function of frequency. We also achieved magnetization values as high as 150 emu/g and as low as 50 emu/g for gold-loaded samples based on % Au by weight. This paves the way to continue to develop magneto-plasmonic structures chemically using these synthesis strategies.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Magnetoplasmonic Air-Stable Au@FeCo

et al. 2023

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“…Iron pentacarbonyl is, however, extremely toxic and its preparation involves the cumbersome reaction of carbon monoxide with reduced iron at very high pressures. Iron pentacarbonyl is also known to decompose at a temperature of approximately 300 °C into a form of carbonyl iron and this may be the actual precursor to the active catalytic phase.…”

Section: Introductionmentioning

confidence: 99%

Direct Coal Liquefaction Using Iron Carbonyl Powder Catalyst

Lokhat

Čárský

2019

Chem Eng & Technol

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Direct coal liquefaction involves catalyzed interactions between molecular hydrogen and coal‐oil slurries at elevated pressure and temperature, typically in the presence of an iron‐based catalyst. Iron carbonyl powder as an alternative first‐stage catalyst was investigated. A series of experimental tests under mild liquefaction conditions were carried out with a high‐pressure batch reactor in order to compare the performance of the iron carbonyl precursor to the traditional superfine iron oxide catalyst. The carbonyl iron powder performed very well in terms of total conversion of coal as well as yield of coal oil product. The iron carbonyl powder acts as an effective precursor for the in situ generation of active iron sulfide. The simple kinetic models for coal liquefaction in the literature were found to be qualitatively consistent with the yields of preasphaltenes, asphaltenes, and oils obtained from the experiments.

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