Carbon nanostructures based on IR-pyrolyzed polyacrylonitrile

Zemtsov, L. M.; Карпачева, Г. П.; Ефимов, М. Н.; Муратов, Д. Г.; Bagdasarova, K. A.

doi:10.1134/s0965545x06060125

Cited by 50 publications

(22 citation statements)

References 19 publications

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“…The catalysts were prepared by two methods, (1) the impregnation of a PS-4% DVB (PS + DVB) copolymer with an iron(III) salt solution followed by solvent evaporation on a water bath and the subse quent heat treatment of the catalyst in an inert atmo sphere under IR irradiation in a pulse photon anneal ing setup [1] at a temperature of 250°С and (2) the swelling of microspherical PS + DVB in the presence of an iron(III) salt solution for 3 days followed by heat treatment in an inert atmosphere under IR irradiation in the pulse photon annealing setup at a temperature of 250°С.…”

Section: Methodsmentioning

confidence: 99%

Catalytic and magnetic properties of nanocomposites based on iron-containing polymer microspheres in Fischer-Tropsch synthesis

et al. 2015

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202Fischer-Tropsch synthesis is a major step in most processes of converting alternative raw materials (nat ural and associated gas, coal, peat, tar sands, various types of biomass, etc.) to motor fuel components. The reaction catalysts are group VIII transition metals (mostly Co or Fe). Any Fischer-Tropsch catalyst with any grain size must be reduced regardless of the prep aration method and subsequent operation conditions. Since the reduction temperatures of Co and Fe are high (400-500°С) and the reaction temperatures are relatively low (below 300°С), the practical implemen tation of the process requires the organization of a sep arate reduction stage. The elimination of the catalyst reduction procedure and the use of a catalyst system that does not exhibit pyrophoric properties in the pres ence of a reduced metal in its composition would sig nificantly improve the overall process economics.Apparently, this problem can be solved by using catalysts prepared of composite materials based on a polymer matrix containing nanoparticles of catalyti cally active metals. IR pyrolysis of the matrix provides the formation of a system with finely divided metal particles.This study is focused on the examination of the catalytic, physicochemical, and magnetic properties of composite nanomaterials for Fischer-Tropsch synthesis that do not require preliminary reduction and in which iron nanoparticles are dispersed in the structure of an IR pyrolyzed polystyrene-divinyl benzene (PS-DVB) copolymer shaped as micro spheres. EXPERIMENTALThe polystyrene-divinylbenzene copolymer used in the study was in the form of microspheres. The DVB content was 4 wt %.The catalysts were prepared by two methods, (1) the impregnation of a PS-4% DVB (PS + DVB) copolymer with an iron(III) salt solution followed by solvent evaporation on a water bath and the subse quent heat treatment of the catalyst in an inert atmo sphere under IR irradiation in a pulse photon anneal ing setup [1] at a temperature of 250°С and (2) the swelling of microspherical PS + DVB in the presence of an iron(III) salt solution for 3 days followed by heat treatment in an inert atmosphere under IR irradiation in the pulse photon annealing setup at a temperature of 250°С.Fischer-Tropsch synthesis was conducted in a fixed bed flow reactor unit in the continuous mode at a pressure of 2 MPa and a syngas space velocity of 1000 h -1 (CO/H 2 molar ratio of 1 : 1) in the temper ature range of 220-400°C. The temperature was increased stepwise (by 20°C every 12 h). By the end of each isothermal step, the gas and the liquid were sampled for analysis.The catalytic tests were conducted without any preliminary reduction stage.The reactant syngas and the gaseous products of synthesis were analyzed by gas-solid chromatography using a Kristallyuks 4000 chromatograph with a ther mal conductivity detector and helium as a carrier gas. CO and N 2 were separated on a 3 m × 3 mm column Abstract-It has been found that the composite material synthesized on the basis of iron containing polymer microspheres...

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Section: Methodsmentioning

confidence: 99%

Catalytic and magnetic properties of nanocomposites based on iron-containing polymer microspheres in Fischer-Tropsch synthesis

et al. 2015

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“…The total metal concentrations in polymer was 20 % wt. IR-chamber of pulse photon annealing was the device, where pyrolysis was conducted [7]. IR-annealing was held in two stages: at first stage for 15 minutes at 150 -200°C preliminary annealing in air during which there was removal of the solvent and initial structuring of PAN and then the main annealing in rarefied atmosphere at a specified temperature.…”

Section: Methodsmentioning

confidence: 99%

Infra-red mediated synthesis of C-Cu-Zn nanocomposites using metal oxides and metal nitrates precursors

Rogushin¹,

Сидорова

Ефимов

2017

J. Phys.: Conf. Ser.

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“…The starting materials were PdCl 2 (Aldrich, 99%); dimethylformamide (dimethylformamide) (Acros Organics, 99%); and polyacrylonitrile (PAN), which was synthesized in the presence of a redox catalyst sys tem by the technique described in [1]. Metal-carbon composites were fabricated under the conditions of IR pyrolisis of a precursor prepared by the joint dissolu tion of PAN and a metal salt in DMF.…”

Section: Methodsmentioning

confidence: 99%

Structural variation in palladium nanoparticles of the C-Pd system when dissolving hydrogen in them

et al. 2012

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The structure of nanocomposites of the C-Pd system has been studied by X ray diffraction anal ysis and transmission electron microscopy. Variations in the lattice period of nanosized palladium, the average amount of hydrogen dissolved in it, and the size distribution of palladium nanoparticles have been analyzed as functions of the nanocomposite fabrication temperature. Based on the structural data, the solubility of hydrogen in nanosized palladium has been estimated.

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Carbon nanostructures based on IR-pyrolyzed polyacrylonitrile

Cited by 50 publications

References 19 publications

Catalytic and magnetic properties of nanocomposites based on iron-containing polymer microspheres in Fischer-Tropsch synthesis

Catalytic and magnetic properties of nanocomposites based on iron-containing polymer microspheres in Fischer-Tropsch synthesis

Infra-red mediated synthesis of C-Cu-Zn nanocomposites using metal oxides and metal nitrates precursors

Structural variation in palladium nanoparticles of the C-Pd system when dissolving hydrogen in them

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