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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Inorganic Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Inorganic Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал неорганической химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-457X</issn><issn publication-format="electronic">3034-560X</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">697892</article-id><article-id pub-id-type="doi">10.7868/S3034560X25090121</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>НЕОРГАНИЧЕСКИЕ МАТЕРИАЛЫ И НАНОМАТЕРИАЛЫ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">INFLUENCE OF SILVER PRECURSORS INTRODUCING METHOD ON PROPERTIES OF MAGNETICALLY RECOVERABLE Ag/FeO<sub>x</sub> CATALYSTS IN 4-NITROPHENOL REDUCTION</article-title><trans-title-group xml:lang="ru"><trans-title>ВЛИЯНИЕ СПОСОБА ВВЕДЕНИЯ ПРЕДШЕСТВЕННИКОВ СЕРЕБРА НА СВОЙСТВА МАГНИТНО-ИЗВЛЕКАЕМЫХ КАТАЛИЗАТОРОВ Ag/FeO<sub>x</sub> В ВОССТАНОВЛЕНИИ 4-НИТРОФЕНОЛА</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Taratayko</surname><given-names>A. V</given-names></name><name xml:lang="ru"><surname>Таратайко</surname><given-names>А. В</given-names></name></name-alternatives><email>taratayko1997@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuznetsov</surname><given-names>T. A</given-names></name><name xml:lang="ru"><surname>Кузнецов</surname><given-names>Т. А</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kozhina</surname><given-names>M. V</given-names></name><name xml:lang="ru"><surname>Кожина</surname><given-names>М. В</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mamontov</surname><given-names>G. V</given-names></name><name xml:lang="ru"><surname>Мамонтов</surname><given-names>Г. В</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Tomsk State University</institution></aff><aff><institution xml:lang="ru">Томский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2025</year></pub-date><volume>70</volume><issue>9</issue><issue-title xml:lang="en">VOL 70, NO9 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 70, №9 (2025)</issue-title><fpage>1201</fpage><lpage>1216</lpage><history><date date-type="received" iso-8601-date="2025-12-05"><day>05</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/0044-457X/article/view/697892">https://transsyst.ru/0044-457X/article/view/697892</self-uri><abstract xml:lang="en"><p>The conducted study aims to compare the properties of magnetically recoverable Ag/FeO<sub>x</sub> catalysts obtained by different synthesis approaches (impregnation, coprecipitation, and impregnation of the pre-reduced support), and to test their activity in 4-nitrophenol reduction in aqueous solution at room temperature. The most active catalysts in 4-nitrophenol reduction are the samples obtained by impregnation with Ag precursors of the pure support (<italic>k</italic> = 2.19 min<sup>−1</sup>) and the pre-reduced one in H<sub>2</sub>/Ar flow at 250°C (<italic>k</italic> = 3.21 min<sup>−1</sup>). This is due to the <italic>in situ</italic> formation of dispersed and active Ag particles from the cationic precursor under the reducing agent NaBH<sub>4</sub> exposure. The nature of the Ag precursors (Ag<sup>+</sup> or Ag(NH<sub>3</sub>)<sub>2</sub> <sup>+</sup>) affects Ag particles' activity. The catalysts in which the ammonia complex Ag(NH<sub>3</sub>)<sub>2</sub> <sup>+</sup> was used as the silver precursor exhibit lower activity compared to samples in which AgNO<sub>3</sub> was used. Differences in thermodynamics and kinetics of Ag<sup>+</sup> or Ag(NH<sub>3</sub>)<sub>2</sub> <sup>+</sup> to Ag<sup>0</sup> reduction determine the morphology and dispersion of metallic silver particles, which affects the activity of the resulting catalysts. The presence of magnetic properties in the catalyst samples is shown by the exposure of an external magnetic field.</p></abstract><trans-abstract xml:lang="ru"><p>Проведено сравнение свойств магнитно-извлекаемых катализаторов Ag/FeO<sub>x</sub>, полученных различными методами синтеза (пропитка, соосаждение и пропитка предварительно восстановленного носителя), и их активности в реакции восстановления 4-нитрофенола в водном растворе при комнатной температуре. Наиболее активными катализаторами являются образцы, полученные методами пропитки предшественниками серебра (AgNO<sub>3</sub> и [Ag(NH<sub>3</sub>)<sub>2</sub>]NO<sub>3</sub>) носителя γ-Fe<sub>2</sub>O<sub>3</sub> (<italic>k</italic> = 2.19 мин<sup>−1</sup>) и оксида железа, предварительно восстановленного в потоке H<sub>2</sub>/Ar при 250°C (<italic>k</italic> = 3.21 мин<sup>−1</sup>). Это связано с формированием <italic>in situ</italic> под действием восстановителя NaBH<sub>4</sub> дисперсных и активных частиц Ag из катионного предшественника серебра. Природа предшественников Ag (Ag<sup>+</sup> или Ag(NH<sub>3</sub>)<sub>2</sub> <sup>+</sup>) оказывает влияние на активность частиц Ag. Катализаторы, в которых предшественником серебра был аммиачный комплекс Ag(NH<sub>3</sub>)<sub>2</sub> <sup>+</sup>, проявляют меньшую активность по сравнению с образцами, в которых применялся AgNO<sub>3</sub>. Различия термодинамики и кипетики восстановления Ag<sup>+</sup> или Ag(NH<sub>3</sub>)<sub>2</sub> <sup>+</sup> до Ag<sup>0</sup> определяют морфологию и дисперсность частиц металлического серебра, что влияет на активность получаемых катализаторов. Наличие магнитных свойств у образцов катализаторов показано действием на них внешнего магнитного поля.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Ag/FeO<sub>x</sub> catalyst</kwd><kwd>silver nanoparticles</kwd><kwd>iron oxide</kwd><kwd>4-nitrophenol reduction</kwd><kwd>mild conditions</kwd><kwd>magnetic recovery</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>катализатор Ag/FeO<sub>x</sub></kwd><kwd>наночастицы серебра</kwd><kwd>оксид железа</kwd><kwd>восстановление 4-нитрофенола</kwd><kwd>мягкие условия</kwd><kwd>магнитное извлечение</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при поддержке Российского научного фонда (грант № 23-73-10152).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Parkinson G.S. // Surf. Sci. Rep. 2016. V. 71. № 1. 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