Fischer–Tropsch synthesis in the presence of nanosized iron-polymer catalysts in a fixed-bed reactor

Хаджиев, С. Н.; Куликова, М. В.; Иванцов, М. И.; Zemtsov, L. M.; Карпачева, Г. П.; Муратов, Д. Г.; Бондаренко, Г. Н.; Окнина, Н. В.

doi:10.1134/s0965544116060049

Cited by 16 publications

(5 citation statements)

References 7 publications

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“…The reflection loss coefficient (RL) is as high as -36 dB (absorption coefficient 0.984). For nanocomposites synthesized at 500 and 600 °C the optimum layer thicknesses are at higher frequencies compared with the range considered (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13).…”

Section: Resultsmentioning

confidence: 95%

Synthesis, structure and electromagnetic properties of FeCoAl/C nanocomposites

Муратов¹,

Кожитов²,

Yakushko³

et al. 2021

MoEM

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Magnetic nanoparticles play an important role in rapidly developing advanced branches of science and industry, e.g. fabrication of magnetic storage media, synthesis of ferromagnetic liquids, medicine and chemistry. One problem faced in the usage of magnetic nanoparticles is their high chemical activity leading to oxidation in air and agglomeration. The chemical activity of magnetic nanoparticles stems from the contribution of their large specific surface to volume ratio. Carbon coating of nanoparticles reduces the interaction between nanoparticles. FeCoAl/C metal-carbon nanocomposites have been synthesized using IR pyrolysis of polymer/metal salt precursors. The effect of synthesis temperature (IR heating) in the range from 500 to 700 °C on the structure and composition of the nanomaterials has been studied. We show that the forming particles are the FeCoAl ternary solid solution with a FeCo based bcc lattice. An increase in the synthesis temperature from 500 to 700 °C leads to an increase in the coherent scattering region of three-component nanoparticles from 5 to 19 nm. An increase in the aluminum content from 20 to 30% relative to Fe and Co results in an increase in the size of the nanoparticles to 15 nm but this also entails the formation of a Co based solid solution having an fcc lattice. An increase in the nanocomposite synthesis temperature and a growth of the relative Al content as a result of a more complete carbonization and the structure-building effect of metals reduce the degree of amorphousness of the nanocomposite carbon matrix and lead to the formation of graphite-like phase crystallites having an ordered structure. The effect of synthesis temperature and relative content of metals on the electromagnetic properties (complex permittivity and permeability) of the synthesized nanocomposites has been studied. Synthesis conditions affect the radio absorption properties of the nanocomposites, e.g. reflection loss (RL) in the 3–13 GHz range.

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Section: Resultsmentioning

confidence: 95%

Synthesis, structure and electromagnetic properties of FeCoAl/C nanocomposites

Муратов¹,

Кожитов²,

Yakushko³

et al. 2021

MoEM

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“…Magnetic nanoparticles (materials) play an important role in the rapidly developing branches of advanced science and industry. Magnetic nanoparticles show good promise for the development of magnetic storage media and the synthesis of ferromagnetic liquids [1,2], in medicine for the transport of medication, as contrasting pigments for magnetic resonance tomography, in hyperthermia treatment [3], in chemistry as catalysts of various petrochemical processes [4], and as ternary metallic catalysts consisting of Cu@FeCo nanoparticle cores and shells that provide for cost reduction due to the absence of noble metals and a substantial improvement of the catalytic activity [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure and electromagnetic properties of FeCoCu/C nanocomposites

Муратов¹,

Кожитов²,

Запороцкова³

et al. 2023

MoEM

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FeCoCu ternary nanoparticles distributed and stabilized in the carbon matrix of FeCoCu/C metal-carbon nanocomposites have been synthesized using controlled IR pyrolysis of precursors consisting of the “polymer / iron acetylacetate / cobalt and copper acetates” type system obtained by joint dissolution of components followed by solvent removal. The effect of the synthesis temperature on the structure, composition and electromagnetic properties of the nanocomposites has been studied. By XRD was shown that the formation of the FeCoCu ternary nanoparticles occurs due to the interaction of Fe3С with the nanoparticles of the CoCu solid solution. An increase in the synthesis temperature leads to an increase in the size of the metal nanoparticles due to their agglomeration and coalescence as a result of matrix reconstruction. Furthermore, ternary alloy nanoparticles having a variable composition may form depending on the synthesis temperature and the content ratio of the metals. Raman spectroscopy has shown that the crystallinity of the carbon matrix of the nanocomposites increases with the synthesis temperature. The frequency responses of the relative permittivity and permeability of the nanocomposites have been studied at 3–13 GHz. It has been shown that a change in the content ratio of the metals noticeably increases both the dielectric and the magnetic losses. The former loss is caused by the formation of a complex nanostructure of the nanocomposite carbon matrix while the latter one originates from an increase in the size of the nanoparticles and a shift of the natural ferromagnetic resonance frequency to the low-frequency region. The reflection loss has been calculated using a standard method from the experimental data on the frequency responses of the relative permittivity and permeability. It has been shown that the frequency range and the absorption of electromagnetic waves (from –20 to –52 dB) can be controlled by varying the content ratio of the metals in the precursor. The nanocomposites obtained as a result of the experiment deliver better results in comparison with FeCo/C nanocomposites synthesized under similar conditions.

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“…Thermoplastics include Polystyrene (PS), Polypropylene (PP), Polyethylene (PE), Polyvinyl Chloride (PVC), and Polyethylene Terephthalate (PET). These widely used thermoplastics can be re-evaluated using chemical recycling energy recovery, and mechanical recycling methods (Paci & La Mantia, 1999;Khadzhiev et al, 2016;Costa et al, 2019;Pan et al, 2021;Siwal et al, 2021). There are four different approaches for recyclable polymeric/plastic waste.…”

Section: Introductionmentioning

confidence: 99%

Hijyenik Ürün Fabrikasında Oluşan Polimerik Atıkların Karakterizasyonu ve Bu Atıklardan Enerji Geri Kazanımı

Keleş

Akbulut

Önal

2023

Yüzüncü Yıl Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, the characterization of polymeric wastes released during production in Eruslu Global group companies and the reusability of these wastes were studied. For this purpose, all polymeric wastes that occur in the production of sanitary napkins, diapers, packaging film and printed packaging film, which are the basic production products of the enterprise; It was determined that it consists of polypropylene, polyethylene (LDPE, MDPE, HDPE), polystyrene, polyethylene terephthalate polymers. Considering that all wastes are not polluted, it has been evaluated that they can be reused to a large extent. In the study conducted for this purpose, it was determined that 20 different waste products emerged depending on the product variety produced in the enterprise. Thermal analysis for each waste was characterized by calorific value, FTIR, XRD and SEM techniques. It was determined that paint was added to polymeric wastes in general. In addition, it has been determined that natural micronized calcite is added to some wastes in terms of environmental impact and cost reduction.

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Fischer–Tropsch synthesis in the presence of nanosized iron-polymer catalysts in a fixed-bed reactor

Cited by 16 publications

References 7 publications

Synthesis, structure and electromagnetic properties of FeCoAl/C nanocomposites

Synthesis, structure and electromagnetic properties of FeCoAl/C nanocomposites

Synthesis, structure and electromagnetic properties of FeCoCu/C nanocomposites

Hijyenik Ürün Fabrikasında Oluşan Polimerik Atıkların Karakterizasyonu ve Bu Atıklardan Enerji Geri Kazanımı

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