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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belousov O. V., Tarabanko V. E., Borisov R. V., Simakova I. L., Zhyzhaev A. M., Tarabanko N., Isakova V. G., Parfenov V. V., Ponomarenko I. V.
Заглавие : Synthesis and catalytic hydrogenation activity of Pd and bimetallic Au–Pd nanoparticles supported on high-porosity carbon materials
Место публикации : React. Kinet. Mech. Catal. - 2019. - Vol. 127, Is. 1. - P.25–39. - ISSN 18785190 (ISSN) , DOI 10.1007/s11144-018-1430-0
Примечания : Cited References: 57
Ключевые слова (''Своб.индексиров.''): mocvd--hydrothermal synthesis--palladium nanoparticles--mesostructured carbon--bimetallic pd–au catalyst--furfural diethyl acetal--hydrogenation
Аннотация: The processes of palladium deposition on various high-porosity carbon matrices (Sibunit, CMK-3) have been studied. Mesostructured carbon material CMK-3 was synthesized using a silicate template of SBA-15 type. Pd nanoparticles were loaded onto carbon matrices by metalorganic chemical vapour deposition (MOCVD) method using palladium(II) acetylacetonate precursor. Bimetal Au–Pd systems were synthesized by autoclave reduction of gold(III) chloride complexes on Pd-containing carbon matrices. Structure of the obtained composite particles was studied by electron microscopy and X-ray diffraction. The average diameter of Pd particles on Sibunit is about 10, and 5–6 nm on CMK-3. The catalytic activity of the synthesized materials was studied in the reaction of furfural diethyl acetal (FDEA) hydrogenation, using gas–liquid chromatographic analysis. There is significant difference in catalytic activity of MOCVD-Pd/C compared to conventional impregnated Pd/C systems: the hydrogenation rate is 3–6 times higher with MOCVD-derived catalysts. Introducing Au into a MOCVD-Pd/C catalyst increases the hydrogenation rate threefold. Considerable difference in the composition of hydrogenation products was observed between these differently prepared catalysts.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samoshkina Yu. E., Edelman I. S., Chou H., Lin H. -C., Dwivedi G. D., Petrov D. A., Zharkov S. M., Zeer G. M., Molokeev M. S.
Заглавие : Structure and physical properties of hydrogenated (Co + Al)-doped ZnO films: Comparative study with co-doped ZnO films
Место публикации : Mater. Sci. Eng. B. - 2021. - Vol. 264. - Ст.114943. - ISSN 09215107 (ISSN), DOI 10.1016/j.mseb.2020.114943
Примечания : Cited References: 52. - H.C. thanks the Ministry of Science and Technology of Taiwan for financial support [grant number MOST 108-2112-M-110-003]. The scanning electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by Ministry of Science and Higher Education of the Russian Federation [state assignment number FSRZ-2020-0011]. X-ray diffraction data were obtained using analytical equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: (Co + Al)-doped ZnO films have been synthesized by the RF magnetron sputtering. Films of this composition have first been obtained in mixed atmosphere of Ar + H2. High hydrogen concentration of 20–50% has been used together with high enough substrate temperature of 450 °C. The used technological conditions affected the morphology, chemical composition, optical, electric, and magnetic properties of the films to an even more than in the case of Co-doped ZnO films synthesized under the same conditions and studied earlier. The films exhibit ferromagnetic behavior at room temperature with much greater magnetization and magneto-optical activity compared to the Co-doped films. At the same time, the hydrogenated films show an increase in electric conductivity in comparison with samples synthesized in the atmosphere of Ar + O2. The magnetic nature of the hydrogenated films has been associated with the defect-related mechanism.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Nikolaev N. S., Elesina V. I., Glushenko G. A., Isakova V. G., Tomashevich Y. V.
Заглавие : Obtaining particles with the structure Mg@C and (Mg@C)@Pd, their properties and stability in the hydrogenation/dehydrogenation processes
Место публикации : Int. J. Hydrogen Energy. - 2022. - Vol. 47. Is. 11. - P.7299-7309. - ISSN 03603199 (ISSN), DOI 10.1016/j.ijhydene.2021.03.042
Примечания : Cited References: 46
Аннотация: In this work, we studied the change in the properties of powders with a core (magnesium) – shell structure (carbon and carbon/palladium) in the process of hydrogenation/dehydrogenation with hydrogen (99.995 wt%). Magnesium powders were obtained by plasma chemical synthesis in an atmosphere of argon containing a small amount of hydrogen (2–3 at.%) and nitrogen (8–9 at.%), when performing a low-frequency arc discharge between a tungsten electrode and a magnesium melt. The shell (carbon and carbon/palladium) was deposited in a plasma generator with vortex and magnetic stabilization. For all samples, a decrease in the sorption capacity of hydrogen was observed as a result of successive cycles of sorption and desorption reactions. It was found that the reason for this fall is associated with the formation of the MgO and Mg(OH)2 phase, which prevents the diffusion of hydrogen. The carbon shell provides a more complete hydrogenation of the magnesium particles, and an additional palladium shell increases the resistance to cyclic hydrogenation/dehydrogenation and reduces the temperature of these processes. According to the data obtained, powders with particles (Mg@C)@Pd can absorb the largest amount of hydrogen (6.9 wt%) for the duration of 5 cycles, after which the protective shell of the particles begins to collapse and a loss of sorption capacity is observed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samoshkina Yu. E., Petrov D. A., Chou H.
Заглавие : Low-hydrogenated ZnCoAlO films: structure, magneto-optical and magnetic behavior
Место публикации : Appl. Phys. A. - 2022. - Vol. 128, Is. 6. - Ст.519. - ISSN 09478396 (ISSN), DOI 10.1007/s00339-022-05665-z
Примечания : Cited References: 16. - This research was funded by the Russian Science Foundation Grant No. 21-72-00061
Аннотация: Morphology, chemical composition, crystal structure, and magnetic circular dichroism of ZnO films doped simultaneously with Co and Al (CAZO) have been studied. The films were deposited on glass substrates by the RF magnetron sputtering of the Zn0.93Co0.05Al0.02O target. Low hydrogen concentrations of 1–4% were used in mixed Ar + H2 atmosphere together with high enough substrate temperature of 450 °C. A tendency to a decrease in the Zn amount and an increase in the relative Co and Al content in the films has been revealed in the presence of hydrogen in the atmosphere. The structural data of the studied films correlate well with those for high-hydrogenated (20–50% H2) CAZO films deposited under the same conditions and studied earlier. The new data indicate the prospect of obtaining ferromagnetic samples based on ZnO without any secondary phases.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chernozatonskii L.A., Sorokin P.B., Kuzubov A.A., Kvashnin A.G., Kvashnin D.G., Avramov P.V., Yakobson B.I., Sorokin B.P.
Заглавие : Influence of Size Effect on the Electronic and Elastic Properties of Diamond Films with Nanometer Thickness
Место публикации : J. Phys. Chem. C. - 2011. - Vol. 115, Is. 1. - P.132-136. - JAN 13. - ISSN 1932-7447, DOI 10.1021/jp1080687
Примечания : Cited Reference Count: 37. - Гранты: L.A.C. was supported by the Russian Academy of Sciences, program No. 21 and by the Russian Foundation for Basic Research (project no. 08-02-01096). P.B.S. and B.I.Y. acknowledge support by the Office of Naval Research (MURI project). P.V.A. and P.B.S. also acknowledge the collaborative RFBR-JSPS grant no. 09-02-92107-R Phi. We are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences for the possibility of using a cluster computer for quantum chemical calculations. The geometry of all presented structures was visualized by commercial Chem-Craft software.Финансирующая организация: Russian Academy of Sciences [21]; Russian Foundation for Basic Research [08-02-01096]; Office of Naval Research (MURI); RFBR-JSPS [09-02-92107-RPhi]
Предметные рубрики: REVERSIBLE HYDROGENATION
GRAPHENE
GRAPHANE
Atomic structure
Band gaps
Diamond nanocrystals
Elastic properties
Electronic band structure calculation
Energy stability
Experimental data
Hydrogen atoms
Nanometer thickness
Size effects
Theoretical result
Diamond films
Elasticity
Carbon films
Ключевые слова (''Своб.индексиров.''): atomic structure--band gaps--diamond nanocrystals--elastic properties--electronic band structure calculation--energy stability--experimental data--hydrogen atoms--nanometer thickness--size effects--theoretical result--diamond films--elasticity--carbon films
Аннотация: The atomic structure and physical properties of few-layered 111 oriented diamond nanocrystals (diamanes), covered by hydrogen atoms from both sides, are studied using electronic band structure calculations. It was shown that energy stability linearly increases upon increasing of the thickness of proposed structures. All 2D carbon films display direct dielectric band gaps with nonlinear quantum confinement response upon the thickness. Elastic properties of diamanes reveal complex dependence upon increasing of the number of 111 layers. All theoretical results were compared with available experimental data.The atomic structure and physical properties of few-layered 〈111〉 oriented diamond nanocrystals (diamanes), covered by hydrogen atoms from both sides, are studied using electronic band structure calculations. It was shown that energy stability linearly increases upon increasing of the thickness of proposed structures. All 2D carbon films display direct dielectric band gaps with nonlinear quantum confinement response upon the thickness. Elastic properties of diamanes reveal complex dependence upon increasing of the number of 〈111〉 layers. All theoretical results were compared with available experimental data. © 2010 American Chemical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Osipova I. V., Tomashevich Y. V., Glushchenko G. A., Fedorov A. S., Popov Z. I., Bulina N. V., Vereshchagin S. N., Zhizhaev A. M., Cherepakhin A. V.
Заглавие : Hydrogenation of the Nanopowders That Form in a Carbon-Helium Plasma Stream during the Introduction of Ni and Mg
Разночтения заглавия :авие SCOPUS: Hydrogenation of the nanopowders that form in a carbon-helium plasma stream during the introduction of ni and Mg
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 6. - P1057-1062. - ISSN 1063-7761, DOI 10.1134/S1063776111140135
Примечания : Cited References: 9. - This work was supported by the Russian Foundation for Basic Research, project no. 09-03-00383-a.
Ключевые слова (''Своб.индексиров.''): carbon atoms--composite nanoparticles--high temperature--hydrogen absorption--hydrogen atoms--island growth--magnesium hydride--magnesium surface--nano powders--nickel atoms--plasma streams--atoms--carbon--composite materials--density functional theory--electron beams--helium--hydrogen--hydrogenation--nanoparticles--nickel--scanning electron microscopy--thermogravimetric analysis--x ray photoelectron spectroscopy--magnesium
Аннотация: Composite nanoparticles consisting of magnesium, nickel, and carbon atoms are studied both theoretically and experimentally. The calculations performed in terms of the density functional theory show that the jump frequency of hydrogen atoms in nickel-containing magnesium hydride increases substantially near impurity nickel atoms; as a result, the rate of hydrogen absorption by magnesium also increases. Nickel on the magnesium surface is shown to be absorbed via an island growth mechanism. Composite Mg-C, Ni-C, and Mg-Ni-C powders are produced by plasmachemical synthesis in a carbon-helium plasma stream. Hydrogen is introduced into a chamber during synthesis. It is found by X-ray photoelectron spectroscopy and thermogravimetric analysis that, among these three composites, only Mg-Ni-C contains magnesium fixed in the MgH2 compound. The process of such "ultrarapid" hydrogenation of magnesium, which occurs in the time of formation of composite nanoparticles, can be explained by the catalytic action of nickel, which is enhanced by a high temperature. Scanning electron microscopy micrographs demonstrate the dynamics of the dehydrogenation of Mg-Ni-C composite nanoparticles in heating by an electron beam.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sychev, Valentin V., Baryshnikov S. V., Ivanov, Ivan P., Volochaev M. N., Taran, Oxana P.
Заглавие : Hydrogenation of levulinic acid to gamma-valerolactone in the presence of Ru-containing catalysts based on carbon material "Sibunit"
Коллективы : Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [20-03-00636]
Место публикации : J. Sib. Fed. Univ. Chem. - 2021. - Vol. 14, Is. 1. - P.5-20. - ISSN 1998-2836, DOI 10.17516/1998-2836-0211; Журн. СФУ. Химия. - ISSN 2313-6049(eISSN)
Примечания : Cited References: 28. - This work was financially supported by the Russian Foundation for Basic Research (RFBR) (project No. 20-03-00636)
Предметные рубрики: BIOMASS
RUTHENIUM
DEHYDRATION
SELECTIVITY
CONVERSION
CELLULOSE
Аннотация: Nanostructured 1 and 3% catalysts containing ruthenium nanoparticles supported on the initial and oxidized at different temperatures graphite-like carbon material Sibunit-4 prepared. A features of this support are mesoporous texture, hydrothermal stability and the presence of surface oxygen-containing functional groups responsible for the distribution of Ru nanoparticles and the catalyst acidic properties. The catalysts characterized using methods TEM, XPS, N2 adsorption, pHpzc and tested in the hydrogenation of levulinic acid to γ-valerolactone. It was found that the reaction rate and GVL selectivity are influenced by solvent choice, fractional composition, and acidic properties of the support. The obtained catalysts provide high activity in the reaction of direct hydrogenation of levulinic acid to γ-valerolactone (GVL yield 98 mol.%, At 160°С, 1.2 MPa H2) and high productivity (15.9 gGVL/gCat.). Obtained catalyst can be reused several times without noticeable loss of activity.Синтезированы наноструктурированные 1 и 3 % катализаторы, содержащие наночастицы рутения, закрепленные на исходном и окисленном при разных температурах графитоподобном углеродном материале Cибунит‑4. Особенность данного носителя состоит в его мезопористой текстуре, гидротермальной устойчивости и наличии на поверхности кислородсодержащих функциональных групп, ответственных за распределение наночастиц Ru и кислотные свойства катализатора. Катализаторы исследованы физико-химическими методами (ПЭМ, РФЭС, адсорбция N2, pHтнз) и испытаны в реакции гидрирования левулиновой кислоты до γ-валеролактона. Установлено, что на скорость реакции и селективность процесса по отношению к ГВЛ оказывают влияние такие факторы, как выбранный растворитель, фракционный состав и кислотные свойства носителя. Полученные катализаторы показали высокую активность в реакции прямого гидрирования левулиновой кислоты до γ-валеролактона (выход ГВЛ 98 мол.% при 160 ºС, 1.2 МПа H2) и высокую производительность (15.9 г ГВЛ/г кат.). Данный катализатор может быть использован многократно без заметной потери активности.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Churilov G. N., Osipova I. V., Novikov P.V., Grebennikova N.V., Chesnokov N.V.
Заглавие : Hydrogenation and properties of Pd-Mg-C and Pd-Al-C nanodispersion systems
Коллективы : "Hydrogen materials science and chemistry of carbon nanomaterials", International Conference
Место публикации : Hydrogen materials science and chemistry of carbon nanomaterials (ICHMS '2009): XI International Conference, Yalta - Crimea - UKRAINE, August 25-31, 2009. - 2009. - P.268-269
Примечания : Библиогр.: 9
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Chou, Hsiung, Samoshkina Yu. E., Petrov D. A., Lin, Hsien C., Chan, Wen L., Sun, Shih-Jye, Zharkov S. M., Bondarenko G. V., Platunov M. S., Rogalev A.
Заглавие : Giant hydrogen effect on the structure and physical properties of ZnO and Co-doped ZnO films fabricated by the RF magnetron sputtering in Ar + H2 atmosphere
Коллективы : Russian Academy of Sciences [0356-2017-0030]; Ministry of Science and Technology of Taiwan [MOST 106-2112-M-110-001]
Место публикации : J. Magn. Magn. Mater. - 2019. - Vol. 489. - Ст.165461. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2019.165461. - ISSN 1873-4766(eISSN)
Примечания : Cited References: 39. - The work is supported by the Russian Academy of Sciences in the frames of Project No 0356-2017-0030 and by the Ministry of Science and Technology of Taiwan MOST 106-2112-M-110-001.
Предметные рубрики: MAGNETOOPTICAL PROPERTIES
OPTICAL-PROPERTIES
FERROMAGNETISM
Аннотация: ZnO and Co-doped ZnO films were synthesized by the radio frequency magnetron sputtering in mixed atmosphere of Ar + 20% O2 and Ar + 20–50% H2. The morphology, chemical composition, crystal structure, optical transmission, electrical resistance, and magnetic circular dichroism of the films were investigated. It was established that the films thickness decreased several times when Ar was partly replaced by hydrogen in the sputtering chamber. At the same time, for the Co-doped ZnO films, the increase in the relative Co content with the increasing hydrogen concentration was observed. These phenomena are explained by the formation of gaseous ZnH2 because of the hydrogen reaction with the growing films under the conditions of the high substrate temperature (450 °C) and, respectively, the decrease in the Zn component in the films. The hydrogenated Co-doped ZnO films exhibit an increase in electric conductivity and ferromagnetic behavior at room temperature. The magnetic nature of the films is explained by a combination of the intrinsic ferromagnetism (due to the formation of the Co-H-Co complex) with the inclusion of metallic Co clusters.
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