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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">cvmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Цветная металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Non-Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3438</issn><issn pub-type="epub">2412-8783</issn><publisher><publisher-name>НИТУ "МИСИС"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0021-3438-2021-1-49-56</article-id><article-id custom-type="elpub" pub-id-type="custom">cvmet-1220</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Металловедение и термическая обработка</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Physical Metallurgy and Heat Treatment</subject></subj-group></article-categories><title-group><article-title>Исследование кинетики процесса получения нанопорошка кобальта водородным восстановлением в изотермических условиях</article-title><trans-title-group xml:lang="en"><trans-title>Study on the kinetics of process for obtaining cobalt nanopowder by hydrogen reduction under isothermal conditions</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тиен</surname><given-names>Хиеп Нгуен</given-names></name><name name-style="western" xml:lang="en"><surname>Tien</surname><given-names>Hieр Nguyen</given-names></name></name-alternatives><bio xml:lang="ru"><p>аспирант кафедры функциональных наносистем и высокотемпературных материалов; лектор</p><p>119991, г. Москва, Ленинский пр., 4</p><p>100000, Вьетнам, г. Ханой</p></bio><bio xml:lang="en"><p>postgraduate student of the Department of functional nanosystems and high-temperature materials; lecturer</p><p>119991, Russia, Moscow, Leninskiiy pr., 4</p><p>100000, Vietnam, Hanoi</p></bio><email xlink:type="simple">htnru7@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский технологический университет (НИТУ) «МИСиС»; Государственный технический университет (ГТУ) им. Ле Куй Дона</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National University of Science and Technology (NUST) «MISIS»; Le Quy Don Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>10</day><month>02</month><year>2021</year></pub-date><volume>1</volume><issue>1</issue><fpage>49</fpage><lpage>56</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Тиен Х., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Тиен Х.</copyright-holder><copyright-holder xml:lang="en">Tien H.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://cvmet.misis.ru/jour/article/view/1220">https://cvmet.misis.ru/jour/article/view/1220</self-uri><abstract><p>Проведено изучение кинетики процесса получения нанопорошка металлического кобальта водородным восстановлением нанопорошка Co(OH)2 при изотермических условиях. Нанопорошок Co(OH)2 заранее получали химическим осаждением из водных растворов нитрата кобальта Со(NO3)2 (10 мас.%) и щелочи NaOH (10 мас.%) при комнатной температуре, рН = 9 и непрерывном перемешивании. Процесс водородного восстановления нанопорошка Co(OH)2 при изотермических условиях про- водили в трубчатой печи в интервале температур от 270 до 310 °С. Исследование кристаллической структуры и состава порошков выполняли методом рентгенофазового анализа. Удельную поверхность образцов измеряли методом БЭТ по низкотемпературной адсорбции азота. Средний размер частиц порошков рассчитывали по данным измерения величины удельной поверхности. Размерные характеристики и морфологию частиц изучали на просвечивающем (ПЭМ) и сканирующем (СЭМ) электронных микроскопах. Расчет кинетических параметров процесса водородного восстановления Co(OH)2 при изотермических условиях проводили с помощью модели Грея–Веддингтона и уравнения Аррениуса. Установлено, что константа скорости восстановления при температуре 310 °C примерно в 1,93 раза больше, чем в случае 270 °С, – соответственно за 40 мин восстановления процесс ускоряется в 1,58 раза. Энергия активации процесса получения нанопорошка кобальта водородным восстановлением Co(OH)2 равна ~40 кДж/моль, что свидетельствует о смешанном режиме реагирования. Показано, что наночастицы кобальта, полученные водородным восстановлением его гидроксида при температуре 280 °С, представляют собой агрегаты частиц равноосной формы, размер которых достигает 100 нм, отдельные частицы соединены с несколькими соседними частицами контактными перешейками.</p></abstract><trans-abstract xml:lang="en"><p>The kinetics of metallic cobalt nanopowder synthesizing by hydrogen reduction from Co(OH)2 nanopowder under isothermal conditions were studied. Co(OH)2 nanopowder was prepared in advance by chemical deposition from aqueous solutions of Co(NO3)2 cobalt nitrate (10 wt.%) and NaOH alkali (10 wt.%) at room temperature, pH = 9 under continuous stirring. The hydrogen reduction of Co(OH)2 nanopowder under isothermal conditions was carried out in a tube furnace in the temperature range from 270 to 310 °C. The crystal structure and composition of powders was studied by X-ray phase analysis. The specific surface area of samples was measured using the BET method by low-temperature nitrogen adsorption. The average particle size of powders was determined by the measured specific surface area. Particles size characteristics and morphology were investigated by transmission and scanning electron microscopes. Kinetic parameters of Co(OH)2 hydrogen reduction under isothermal conditions were calculated using the Gray–Weddington model and Arrhenius equation. It was found that the rate constant of reduction at t = 310 °C is approximately 1.93 times higher than at 270 °C, so the process accelerates by 1.58 times for 40 min of reduction. The activation energy of cobalt nanopowder synthesizing from Co(OH)2 by hydrogen reduction is ~40 kJ/mol, which indicates a mixed reaction mode. It was shown that cobalt nanoparticles obtained by the hydrogen reduction of its hydroxide at 280 °C are aggregates of equiaxed particles up to 100 nm in size where individual particles are connected to several neighboring particles by contact isthmuses.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>кинетика</kwd><kwd>нанопорошок кобальта</kwd><kwd>водородное восстановление</kwd><kwd>изотермические условия</kwd><kwd>степень превращения</kwd><kwd>константа скорости</kwd><kwd>энергия активации</kwd></kwd-group><kwd-group xml:lang="en"><kwd>kinetics</kwd><kwd>cobalt nanopowder</kwd><kwd>hydrogen reduction</kwd><kwd>isothermal conditions</kwd><kwd>reduction degree</kwd><kwd>rate constant</kwd><kwd>activation energy</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bhushan B. (Ed.). Springer handbook of nanotechnology. 4th ed. 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