PERSPEKTIVNYE MATERIALY
2022, No.5
Chemical properties and electronic structure
of molybdenum oxysulfide films
for promising photoelectrocatalysts
for hydrogen production
V. N. Nevolin, R. I. Romanov, D. V. Fominski,
O. V. Rubinkovskaya, V. Yu. Fominski
The effect of sulfur and oxygen concentrations on the formation of chemical bonds in films based on the ternary compound Mo – S – O, which is of interest for solving the problem of obtaining effective thin-film catalysts for electrochemical, especially photo-activated, water splitting reaction, has been studied. The films were created by pulsed laser deposition in a mixture of gases (argon and oxygen) at room temperature of the substrate. Factors that have an important effect on the position of the Fermi level in the band gap of a ternary compound are revealed, which largely determines the choice of components in hybrid and heterostructures for photoelectrodes. The change in the chemical state of Mo – S – O films in the electrochemical process of hydrogen evolution in an acid solution has been studied. Character of changes in the local packing of atoms (self-organization) are revealed, manifested in a decrease in the concentration of metal oxide clusters and an increase in the concentration of Mo – S clusters on the surface of such films. The thermodynamic analysis which was carried out using the density functional theory showed that when oxygen is removed from the surface of Mo – S – O films and, as a result, the hybrid structure MoSx/(Mo – S – O) is formed, the efficiency of hydrogen evolution can be controlled by the quantum chemical interaction of different clusters. In this case, only certain combinations of clusters can provide a sufficiently high catalytic activity.
Keywords: pulsed laser deposition, molybdenum oxysulphides, hydrogen production, chemical state, band structure, chemical stability, modeling.
DOI: 10.30791/1028-978X-2022-5-5-16
Nevolin Vladimir — National Research Nuclear University “MEPhI” (Moscow, 115409, Kashirskoe sh., 31), Doctor of physical and mathematical sciences, professor, specialist in the field of physics of thin-films and nanosystems. E-mail: nevolin@sci.lebedev.ru.
Romanov Roman — National Research Nuclear University “MEPhI” (Moscow, 115409 Kashirskoe sh., 31), PhD (Phys-Math), researcher, specialist in the field of physical and chemical methods for obtaining and studying thin-film structures of various functional purposes. E-mail: limpo2003@mail.ru.
Fominski Dmitry — National Research Nuclear University “MEPhI” (Moscow, 115409, Kashirskoye sh., 31), engineer, specialist in the field of pulsed laser deposition of thin films and nanostructures. E-mail: dmitryfominski@gmail.com.
Rubinkovskaya Oksana — National Research Nuclear University “MEPhI” (Moscow, 115409, Kashirskoye sh., 31), PhD student, specialist in the field of production and research of semiconductor catalysts based on transition metal chalcogenides. E-mail:
oxygenofunt@gmail.com.
Fominski Vyacheslav — National Research Nuclear University “MEPhI” (Moscow, 115409, Kashirskoye sh., 31), doctor of physical and mathematical sciences, professor, chief researcher, specialist in the field of physics of thin-films, nanostructures and beam technologies of surface modification. E-mail: vyfominskij@mephi.ru.
Nevolin V.N., Romanov R.I., Fominski D.V., Rubinkovskaya O.V., Fominski V.Yu. Himicheskie svojstva i elektronnaya struktura plenok oksisul'fidov molibdena dlya perspektivnyh fotoelektrokatalizatorov polucheniya vodoroda [Chemical properties and electronic structure of molybdenum oxysulfide films for promising photoelectrocatalysts for hydrogen production]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2022, no. 5, pp. 5 – 16. DOI: 10.30791/1028-978X-2022-5-5-16
Features of niobium damage
by pulse laser radiation in comparison
with beam-plasma impact
V. N. Pimenov, I. V. Borovitskaya, A. S. Demin,
N. A. Epifanov, E. E. Kazilin, S. V. Latyshev,
S. A. Maslyaev, E. V. Morozov, I. P. Sasinovskaya,
G. G. Bondarenko, A. I. Gaydar
The features of damageability of niobium by pulsed fluxes of laser radiation (LR) in the free-running modes (power density qFR = 105 – 106 W/cm2 with pulse duration tFR = 700 μs) and Q-switch mode (q = 108 – 109 W/cm2, tMD = 80 ns) in comparison with the pulsed effects of helium ion (HI) and helium plasma (HP) fluxes in the Plasma Focus (PF) setup at a flux power density qi ~ 108 W/cm2 and qp~ 107 W/cm2, respectively and pulse durations ti ≈ 30 – 50 ns and tp ≈ 100 ns. LR fluxes were exposed to Nb in air; the working gas in the PF chamber was helium. It is shown that, in contrast to the effect of IG and HP fluxes on niobium in the PF installation, which contribute to the erosion of the material, the irradiation of niobium by pulsed LR in air fluxes under the conditions implemented does not cause noticeable surface erosion. When Nb is exposed to pulsed LR in the FR mode, the melt interacts with the air and forms on the irradiated surface of a thin film of elements of the liquid and gas phases. A similar nature of damage to Nb under the conditions of laser and beam-plasma treatment was found: a wavy relief of the irradiated surface with the presence of drop-like fragments on it, extended wave crests and microcracks. Irradiation of Nb by pulsed LR fluxes in the FR mode leads to the formation in the surface layer (SL) of sections with block and cellular structures, which are also formed after experiments in the PF chamber. It was found that after laser treatment in the FR and Q-switch modes, bubbles (blisters) are not formed in the SL of niobium, which are always present on the irradiated surface when exposed to pulsed fluxes of HI and HP in the PF chamber due to the implantation of helium ions in Nb. It is noted that in laser experiments there is no possibility of implanting working gas ions into the material, which is characteristic of beam-plasma impacts in PF devices, which affects the parameters of damageability and modification of the structure of the irradiated SL.
Keywords: pulsed fluxes, laser radiation, helium plasma, helium ions, plasma focus, melting, crystallization, microstructure.
DOI: 10.30791/1028-978X-2022-5-17-30
Pimenov Valeriy — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii Prospect, Moscow 119334, Russia), Dr Sci (Phys.Math.), head of laboratory. E-mail: pimval@mail.ru.
Borovitskaya Irina — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii Prospect, Moscow 119334, Russia), PhD, senior research worker. E-mail: symp@imet.ac.ru.
Demin Aleksandr — Baikov Institute of Metallurgy and Material Science of RAS (49 Leninskii Prospect, Moscow 119334, Russia), research worker. E-mail: casha@bk.ru.
Epifanov Nikita — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii Prospect, Moscow 119334, Russia), junior researcher; National Research University Higher School of Economics (20 Myasnitskaya, Moscow 101000, Russia), postgraduate student. E-mail: mophix94@gmail.com.
Kazilin Evgeniy — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii Prospect, Moscow 119334, Russia), PhD, senior research worker. E-mail: symp@imet.ac.ru.
Latyshev Sergei — Baikov Institute of Metallurgy and Material Science of RAS (49 Leninskii Prospect, Moscow 119334, Russia), PhD, senior research worker. Moscow Technical University of Communications and Informatics (8a Aviamotornaya Street, Moscow 111024, Russia), associate professor. E-mail: latyshevsv@rambler.ru.
Maslyaev Sergey — Baikov Institute of Metallurgy and Material Science RAS (49 Leninskii Prospect, Moscow 119334, Russia), PhD, senior research worker. E-mail: maslyaev@mail.ru.
Morozov Evgenii — Baikov Institute of Metallurgy and Material Science of RAS (49 Leninskii Prospect, Moscow 119334, Russia), research worker. E-mail addres: lieutenant@list.ru.
Sasinovskaya Irina — Baikov Institute of Metallurgy and Material Science RAS
(49 LeninskiiProspect, Moscow 119334, Russia), research worker. E-mail: porfirievna@mail.ru.
Bondarenko Gennadii — National Research University Higher School of Economics (20 Myasnitskaya, Moscow 101000, Russia), Dr Sci (Phys-Math), professor. E-mail:
gbondarenko@hse.ru.
Gaidar Anna — Research Institute of Advanced Materials and Technologies (12 Malaya Pionerskaya, Moscow 115054, Russia), PhD, senior research worker. E-mail: niipmt@mail.ru.
Pimenov V.N., Borovitskaya I.V., Demin A.S., Epifanov N.A., Kazilin E.E., Latyshev S.V., Maslyaev S.A., Morozov E.V., Sasinovskaya I.P., Bondarenko G.G., Gaydar A.I. Osobennosti povrezhdaemosti niobiya impul'snym lazernym izlucheniem v sravnenii s puchkovo-plazmennym vozdejstviem [Features of niobium damage by pulse laser radiation in comparison with beam-plasma impact]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2022, no. 5, pp. 17 – 30. DOI: 10.30791/1028-978X-2022-5-17-30
Rheological properties of metal-filled
systems based on low-density
polyethylene and aluminum
Kh. V. Allahverdiyeva, N. T. Kakhramanov, M. I. Abdullin
The paper considers the fundamental principles of the study of the rheological features of the melt flow of the initial low-density polyethylene and its filled compositions with aluminum powder, depending on the filler concentration, temperature and shear rate. To improve the compatibility of metal-polymer systems, a compatibilizer was used, which is a graft copolymer of low density polyethylene with 5 – 7 wt. % maleic anhydride content. First, the values of the melt flow rate of low density polyethylene were determined depending on the concentration of aluminum powder. The filler concentration was varied in the range 0.5 – 30 wt. %. It is shown that with the loading of 0.5 wt. % aluminum powder, the maximum fluidity of the composites melt is achieved. The flow curves, the dependence of the effective viscosity on the shear rate of the initial low-density polyethylene and composites with 0.5 wt. % and 5.0 wt. % content of aluminum powder were determined. The theoretical substantiation of the regularities of changes in rheological properties is given. The regularity of the change in the effective viscosity of the melt on temperature in Arrhenius coordinates has been established. On the basis of the curves obtained, the values of the activation energy of the viscous flow are determined. It was found that with the loading of the filler, an increase in the activation energy of the viscous flow is observed. A temperature-invariant characteristic of the viscosity properties of composites has been constructed, which makes it possible to predict the change in the value of this indicator at high shear rates, close to their processing by extrusion and injection molding. The developed materials have passed industrial testing at the METAK LLC enterprise in Azerbaijan.
Keywords: viscosity, shear rate, shear stress, composites, polymer melt.
DOI: 10.30791/1028-978X-2022-5-31-39
Allahverdiyeva Khayala Vagif gizi — Institute of Polymer Materials of Azerbaijan National Academy of Sciences (AZ5004, Sumgait city, S. Vurgun Str. 124), PhD (Chem), assistant professor, leading researcher, specialist in the field of mechano-chemical modification of polymers, the study of the structure and properties of polymer composites. E-mail:
xayalaka4@gmail.com.
Kakhramanov Najaf Tofig oglu — Institute of Polymer Materials of Azerbaijan National Academy of Sciences (AZ5004, Sumgait city, S. Vurgun Str. 124), Dr Sci (Chem), professor, head of the laboratory, specialist in the field of chemical and mechanochemical modification of polymers, processing, obtaining and study of the complex of properties of nanocomposites based on minerals, metals and polyolefins. E-mail: najaf1946@rambler.ru.
Abdullin Marat Ibragimovich — Bashkir State University (450076, Republic of Bashkortostan, Ufa, Zaki Validi st., 32), Dr Sci (Eng), professor of the department, corresponding member NAS RF, specialist in the field of chemical and mechanochemical modification of polymers, processing, research of the structure and properties of filled polymer composites. E-mail: profAMI@yandex.ru.
Allahverdiyeva Kh.V., Kakhramanov N.T., Abdullin M.I. Reologicheskie svojstva metallonapolnennyh sistem na osnove polietilena nizkoj plotnosti i alyuminiya [Rheological properties of metal-filled systems based on low-density polyethylene and aluminum]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2022, no. 5, pp. 31 – 39. DOI: 10.30791/1028-978X-2022-5-31-39
Estimation of distribution uniformity
of Ti2NbAl particles in an aluminum-matrix
composite material
I. E. Kalashnikov, L. I. Kobeleva, P. A. Bykov,
A. G. Kolmakov, I. V. Katin, R. S.Mikheev
There was analyzed the distribution uniformity of reinforcing particles Ti2NbAl in composite materials (CM) based on aluminum alloy AO20-1, made by mechanical mixing. Samples with different structure dispersion were obtained by crystallization of a composite melt in molds made of materials with different thermal conductivity. There were used methods of digitizing the structure microphoto and mathematical statistics to estimation structural heterogeneity. Based on the results of processing the photographic images, there were constructed histograms of the frequencies of the distribution of intermetallic particles in the matrix. It is revealed that matrix structure refinement has positive effect on uniformity of the distribution. A significant decrease in the coefficient of variation for specimens with a finer structure also indicates a more uniform distribution of the reinforcing phase in this specimens. There was compared a wear resistance of the material and the uniformity of distribution of the Ti2NbAl powder in the matrix. A wear rate of composite materials was determined by testing on CETR UMT Multi-Specimen Test System under dry sliding friction conditions with sequential stepwise axial loading to values of 0.5, 1, 1.5, 2, 2.5, 3 MPa, at constant sliding speed of 0.5 m/s. The test time for each axial load was 2000 s, the friction path was 6000 m. It was observed a significant reduction in weight loss during friction for all CM samples as compared to the matrix alloy. The wear rate of CM specimens with a better distribution of the reinforcing component is reduced by more than 2.7 times as compared to specimens from the AO20-1 alloy, and with a less uniform distribution by 2.2 times
Keywords: aluminum-matrix composite material, structure dispersion, uniformity of distribution, wear rate.
DOI: 10.30791/1028-978X-2022-5-40-48
Kalashnikov Igor —Baikov Institute of Metallurgy and Material Science RAS (119334, Moscow, Leninsky pr., 49), Dr Sci (Eng), leading researcher, specialist in science of composite materials. E-mail: kalash2605@mail.ru.
Kobeleva Lubov — Baikov Institute of Metallurgy and Material Science RAS (119334, Moscow, Leninsky pr., 49), PhD, leading researcher, specialist in science of composite materials. E-mail: likob@mail.ru.
Bykov Pavel —Baikov Institute of Metallurgy and Material Science RAS (119334, Moscow, Leninsky pr., 49), researcher in the field of tribology. E-mail: pbykov@imet.ac.ru.
Kolmakov Alexey —Baikov Institute of Metallurgy and Material Science RAS (119334, Moscow, Leninsky pr., 49), Dr Sci (Eng), leading researcher, specialist in science of composite materials. E-mail: akolmakov@imet.ac.ru.
Katin Igor —Baikov Institute of Metallurgy and Material Science RAS (119334, Moscow, Leninsky pr., 49), researcher, specialist in obtaining of composite materials. E-mail:
i.katin@mail.ru.
Mikheev Roman —Bauman Moscow State Technical University (105005, Moscow, 2 Bauman st., 5), Dr Sci (Eng.), professor, specialist in joining of new construction materials. E-mail: mikheev.roman@mail.ru.
Kalashnikov I.E., Kobeleva L.I., Bykov P.A., Kolmakov A.G., Katin I.V., Mikheev R.S. Ocenka ravnomernosti raspredeleniya chastic Ti2NbAl v alyumomatrichnom kompozicionnom materiale [Estimation of distribution uniformity of Ti2NbAl particles in an aluminum-matrix composite material]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2022, no. 5, pp. 40 – 48. DOI: 10.30791/1028-978X-2022-5-40-48
Synthesis and investigation of physical
and chemical properties
of nanopowders and ceramics
in the La2O3–SrO–Ni(Co,Fe)2O3system
M. V. Kalinina, D. A. Dyuskina, T. V. Khamova,
L. N. Efimova, O. A. Shilova
By the method of joint crystallization of solutions of nitrate salts highly dispersed powders of the composition: La1 – xSrxNiO3, La1 – xSrxCoO3 and La1 – xSrxFe0,7Ni0,3O3(x = 0,30; 0,40) were synthesized. They have a specific pore volume of 0.018 – 0.035 cm3/g and a specific surface area of 15 – 31 m2/g. On their basis, ceramic nanomaterials of a given composition with CSR ~ 64 – 70 nm (1300 °С) were obtained. The physical and chemical properties of the obtained ceramics were studied; it was revealed that it is a solid solution with open porosity in the range of 17 – 30 %, high values of the relative density of 94 %. In terms of their physical and chemical properties (open porosity, density, coefficient of thermal expansion), the obtained ceramic materials are promising as solid oxide cathodes for medium-temperature fuel cells.
Keywords: joint crystallization of salts, oxides, fine powders, nanoceramics, porosity, fuel cells, cathode materials.
DOI: 10.30791/1028-978X-2022-5-49-57
Kalinina Marina —Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya, 2), PhD, senior researcher, specialist in physical and chemical properties of nanocrystalline oxide materials. E-mail: tikhonov_p-a@mail.ru.
Dyuskina Daria —Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya 2), research engineer, carries out the synthesis of materials. E-mail: randkald@mail.ru.
Khamova Tamara —Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya 2), PhD, scientific secretary, specialist in the field of research of dispersion and texture properties of nanopowders. E-mail: tamarakhamova@gmail.com.
Efimova Larisa — Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya 2), researcher, specialist in the field of research of thermolysis of nanopowders.
Shilova Olga —Grebenschikov Institute of Silicate Chemistry of Russian Academy of Sciences (199034, Saint-Petersburg, Makarova naberezhnaya 2), Dr Sci, professor, chief researcher, acting head of the Laboratory of inorganic synthesis, specialist in the field of physical chemistry and technology of glass-ceramic nanocomposite materials. E-mail: olgashilova@bk.ru.
Kalinina M.V., Dyuskina D.A., Khamova T.V., Efimova L.N., Shilova O.A. Sintez i issledovanie nanoporoshkov i keramiki sistemy La2O3 – SrO – Ni(Co,Fe)2O3 [Synthesis and investigation of physical and chemical properties of nanopowders and ceramics in the La2O3–SrO–Ni(Co,Fe)2O3system]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2022, no. 5, pp. 49 – 57. DOI: 10.30791/1028-978X-2022-5-49-57
Investigation of the protective properties
of coatings obtained by microarc oxidation
in alkaline electrolyte solutions
Zh. M. Ramazanova, M. G. Zamalitdinova, K. Zh. Kirgizbayeva,
A. U. Akhmedyanov, A. Y. Zhakupova
The article presents the results of a study of the corrosion properties of oxide coatings compacted with polymers and without compaction. Oxide coatings were obtained on VT1-0 and VT5 titanium alloys under the influence of fast pulsed actions of the micro-arc oxidation (MAO) process. To form MAO coatings, a pulsed mode of the process was used with an anodic current pulse duration of 250 ± 25 μs; the cathodic current pulse duration of 5 ± 0.5 ms; pause between anodic and cathodic current pulses 250 ± 25 μs; repetition rate of anodic and cathodic pulses 50 ± 0.5 Hz. Alkaline solutions were used as electrolytes. Fluoroplastic and epoxy resin solutions were used to seal the oxide coatings. The obtained MAO coatings have 4.4 – 7.5 % porosity on the VT1-0 alloy and 5.4 – 12.1 % on the VT5 alloy. The average diameter of oxide coating pores varies from 0.1 to 0,5 µm. X-ray phase analysis showed titanium dioxide in anatase and rutile modification in the oxide coatings composition. Tests performed in a 24 % solution of sulfuric acid at 40 and 75°C showed that the coatings on the VT1-0 alloy, both oxide and oxide-polymer, are more corrosion resistant than similar coatings on the VT5 alloy. All types of coatings produced on VT1-0 alloy are corrosion-resistant at a test temperature of 40 °C. Consolidation of MAO coatings with polymeric materials improves corrosion properties.
Keywords: oxide coating, current density, voltage, electrolyte solution, plasma electrolytic oxidation, corrosion, corrosion parameters.
DOI: 10.30791/1028-978X-2022-5-58-68
Ramazanova Zhanat —National Center of Space Research and Technology Joint-Stock Company (Republic of Kazakhstan, Nur-Sultan, st. Kazhimukan, 11), PhD (Chem), associate professor, head of the Space monitoring center, Nur-Sultan “NCRT” JSC; Kazakh Agrotechnical University named after S. Seifullin associate professor, specialist in physicochemical laws of the formation of oxide layers on materials by the method of microarc oxidation, technology of electrochemical production, materials science. E-mail: zh_ram@mail.ru.
Zamalitdinova Marina —National Center of Space Research and Technology Joint-Stock Company (Republic of Kazakhstan, Nur-Sultan, st. Kazhimukan, 11), master of information systems; Nur-Sultan, “NCRT” JSC, researcher of the Center for space monitoring, specialist in information technology, statistical processing. Е-mail: kazncsm@yandex.ru.
Kirgizbayeva Kamilya —L.N. Gumilyov Eurasian National University (Republic of Kazakhstan, Nur-Sultan, st. Kazhimukan, 13), PhD (Eng.), associate professor, specialist in technology of polymeric materials, standardization. E-mail: kirg_kam@mail.ru.
Akhmedyanov Abdulla — L.N. Gumilyov Eurasian National University (Republic of Kazakhstan, Nur-Sultan, st. Kazhimukan, 13), PhD (Eng), associate professor, specialist in materials science and new materials, standardization. E-mail: abdulla261@yandex.ru.
Zhakupova Almira — L.N. Gumilyov Eurasian National University (Republic of Kazakhstan, Nur-Sultan, st. Kazhimukan, 13), PhD (Eng), associate professor, specialist in solid state physics, materials science. E-mail: mira7906@mail.ru.
Ramazanova Zh.M., Zamalitdinova M.G., Kirgizbayeva K.Zh., Akhmedyanov A.U., Zhakupova A.Y. Issledovanie zashchitnyh svojstv pokrytij, poluchennyh metodom mikrodugovogo oksidirovaniya v shchelochnyh rastvorah elektrolitov [Investigation of the protective properties of coatings obtained by microarc oxidation in alkaline electrolyte solutions]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2022, no. 5, pp. 58 – 68. DOI: 10.30791/1028-978X-2022-5-58-68
Microwave absorbers based on Fe and Fe – Al
particles obtained in the field
of rotational magnetic dipoles
M. D. Sosnin, I. A. Shorstky, E. G. Sokolov,
D. I. Volkhin, A. G. Vostretsov
The purpose of the work is to obtain microwave absorber materials based on Fe – Al particles and to study its absorbing characteristics. Composite materials consisting of Fe, Fe – Al particles and a paraffin matrix were obtained by rotational magnetic field method. The mechanism of the field of rotational magnetic dipoles usage for Fe particles coating with Al nanoparticles and further composite material synthesis was described. Microstructure, mechanical, magnetic and dielectric properties and parameters of microwave absorption of obtained composite materials were investigate. Magnetic and dielectric permittivity in the frequency range 8 – 12 GHz were obtained. The influence of the field of rotational magnetic dipoles in combination with Al nanoparticles allows to obtain more durable structure in comparison with composite materials without Al nanoparticles. It was found that composite materials have a good radio-absorbing properties in the studied frequency range. The maximal value of S21 = –27,9 dB was obtained on 12 GHz frequency for a Fe – Al composite material with the field of rotational magnetic dipoles application.
Keywords: rotational magnetic dipole, microwave absorption, magnetic permeability, dielectric permittivity, composite material, iron particle.
DOI: 10.30791/1028-978X-2022-5-69-77
Sosnin Maksim — Kuban State University of Technology (2, Moskovskaya street, Krasnodar, Russia, 350004), PhD student, specialist in the production of composite materials for electromagnetic absorption. E-mail: maksim-sosnin7@mail.ru.
Shorstkii Ivan — Kuban State University of Technology (2, Moskovskaya street, Krasnodar, Russia, 350004), PhD (Eng.), senior lecturer of Technological equipment and life-support systems department, specialist in the field of composite materials development and synthesis using electrophysical methods. E-mail: i-shorstky@mail.ru.
Sokolov Evgeny —Kuban State University of Technology (2, Moskovskaya street, Krasnodar, Russia, 350004), PhD (Eng.), senior lecturer of car service and materials science department, specialist in the field of materials science and powder materials. E-mail: e_sokolov.07@mail.ru.
Volkhin Dmitry —Novosibirsk State Technical University (220, Karl Marx Avenue, Novosibirsk, 630073), PhD (Eng.), senior lecturer of car service and materials science department, specialist in the field of radio-electronic devices design. E-mail: volxin@corp.nstu.ru.
Vostretsov Alexey — Novosibirsk State Technical University (220, Karl Marx Avenue, Novosibirsk, 630073), Dr Sci (Eng), professor, head of laboratory of quantum cryogenic electronics, specialist in the field of quantum cryogenic electronics. E-mail:
vostreczov@corp.nstu.ru.
Sosnin M.D., Shorstky I.A., Sokolov E.G., Volkhin D.I., Vostretsov A.G. Poglotiteli elektromagnitnogo izlucheniya SVCH-diapazona na osnove chastic Fe i Fe – Al, poluchennye v pole vrashchayushchihsya magnitnyh dipolej [Microwave absorbers based on Fe and Fe – Al particles obtained in the field of rotational magnetic dipoles]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2022, no. 5, pp. 69 – 77. DOI: 10.30791/1028-978X-2022-5-69-77
Simultaneous synthesis of porous
ceramic materials with obtaining catalytic
converters of [Re,W]/a-Al2O3composition
for hydrocarbon dehydrogenation
V. I. Uvarov, R. D. Kapustin, A. O. Kirillov,
A. S. Fedotov, M. V. Tsodikov
A porous ceramic catalytic converter based on a coarse powder filler α-Al2O3with an ultrafine strengthening binder of MgO + SiC + SiO2 composition and catalytically active components of Re2O7 and WО3 (up to 4 mass %) was synthesized. Double-sided compaction of the initial mixture at P = 70 to 90 MPa and sintering of the samples at 1200°C to 1400 °C was used. Ceramic catalytic converters with an open porosity of about 40% and a pore size of 0.5 to 1.5 µm were synthesized. Styrene selectivity of about 30% and productivity up to 30 g/(h×dm3) in the temperature range from 600 to 700 °С have been experimentally achieved. The degree of catalyst carbonization during the experiment (6 h) did not exceed 0.31 wt. %. A high selectivity for styrene of about 30 % was achieved during the experiments; it was realized in temperature range from 600 to 700 °C. As a result of the research, the scientific basis of a new one-stage technology for obtaining a porous ceramic was developed with simultaneous imparting of catalytic properties. The obtained ceramic catalytic converters can produce styrene with high efficiency and resistance to coke formation in a wide temperature range.
Keywords: porous ceramic catalytic converters, rhenium-tungsten catalysts, ethylbenzene dehydrogenation, styrene production, ceramics, technological combustion.
DOI: 10.30791/1028-978X-2022-5-78-86
Uvarov Valerii —Merzhanov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences (142432, Chernogolovka, Academician Osipyan str., 8), PhD (Tech.), leading researcher, specialist in self-propagating high-temperature synthesis and material sciences. E-mail: uvar@ism.ac.ru.
Kapustin Roman — Merzhanov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences (142432, Chernogolovka, Academician Osipyan str., 8), PhD (Tech.), senior researcher, specialist in functional ceramic materials and nanomaterials. E-mail: kapustin-roman@mail.ru.
Kirillov Andrey — Merzhanov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences (142432, Chernogolovka, Academician Osipyan str., 8), post-graduate student, junior researcher. E-mail: avanfer@yandex.ru.
Fedotov Alexey —A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences (119991, Moscow, Leninsky prospect, 29), PhD (Tech.), leading researcher, specialist in the field of petrochemistry, heterogeneous catalysis and membrane technologies. E-mail: alexey.fedotov@ips.ac.ru.
Tsodikov Mark —A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences (119991, Moscow, Leninsky prospect, 29), Dr. Sci. (Tech.), head of laboratory, specialist in the field of petrochemistry, heterogeneous catalysis and materials science. E-mail: tsodikov@ips.ac.ru.
Uvarov V.I., Kapustin R.D., Kirillov A.O., Fedotov A.S., Tsodikov M.V. Energoeffektivnyj odnostadijnyj sintez keramicheskogo kataliticheskogo konvertera sostava [Re,W]/ a-Al2O3 dlya degidrirovaniya etilbenzola v stirol [Simultaneous synthesis of porous ceramic materials with obtaining catalytic converters of [Re,W]/a-Al2O3 composition for hydrocarbon dehydrogenation]. Perspektivnye Materialy [Advanced Materials] (in Russ), 2022, no. 5, pp. 78 – 86. DOI: 10.30791/1028-978X-2022-5-78-86
