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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">catal</journal-id><journal-title-group><journal-title xml:lang="ru">Катализ в промышленности</journal-title><trans-title-group xml:lang="en"><trans-title>Kataliz v promyshlennosti</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1816-0387</issn><issn pub-type="epub">2413-6476</issn><publisher><publisher-name>LLC "KALVIS"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18412/1816-0387-2024-1-60-68</article-id><article-id custom-type="elpub" pub-id-type="custom">catal-996</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>КАТАЛИЗ В ХИМИЧЕСКОЙ И НЕФТЕХИМИЧЕСКОЙ ПРОМЫШЛЕННОСТИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CATALYSIS IN CHEMICAL AND PETROCHEMICAL INDUSTRY</subject></subj-group></article-categories><title-group><article-title>Применение СВЧ-излучения для синтеза золькеталя из глицерина и ацетона</article-title><trans-title-group xml:lang="en"><trans-title>Microwave-assisted synthesis of solketal from glycerol and acetone</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>Болотов</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bolotov</surname><given-names>V. A.</given-names></name></name-alternatives><email xlink:type="simple">ctls@kalvis.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кибилюк</surname><given-names>А. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Kibilyuk</surname><given-names>A. E.</given-names></name></name-alternatives><email xlink:type="simple">ctls@kalvis.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пармон</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Parmon</surname><given-names>V. N.</given-names></name></name-alternatives><email xlink:type="simple">ctls@kalvis.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Панченко</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Panchenko</surname><given-names>V. N.</given-names></name></name-alternatives><email xlink:type="simple">ctls@kalvis.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тимофеева</surname><given-names>М. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Timofeeva</surname><given-names>M. N.</given-names></name></name-alternatives><email xlink:type="simple">ctls@kalvis.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Институт катализа им. Г.К. Борескова СО РАН (ИК СО РАН), Новосибирск<country>Россия</country></aff><aff xml:lang="en">Boreskov Institute of Catalysis SB RAS, Novosibirsk<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Новосибирский государственный технический университет (НГТУ), Новосибирск<country>Россия</country></aff><aff xml:lang="en">Novosibirsk State Technical University, Novosibirsk<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru">Институт катализа им. Г.К. Борескова СО РАН (ИК СО РАН), Новосибирск; Новосибирский государственный технический университет (НГТУ), Новосибирск<country>Россия</country></aff><aff xml:lang="en">Boreskov Institute of Catalysis SB RAS, Novosibirsk; Novosibirsk State Technical University, Novosibirsk<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>23</day><month>01</month><year>2024</year></pub-date><volume>24</volume><issue>1</issue><fpage>60</fpage><lpage>68</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; LLC "KALVIS", 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">LLC "KALVIS"</copyright-holder><copyright-holder xml:lang="en">LLC "KALVIS"</copyright-holder><license xlink:href="https://www.catalysis-kalvis.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.catalysis-kalvis.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.catalysis-kalvis.ru/jour/article/view/996">https://www.catalysis-kalvis.ru/jour/article/view/996</self-uri><abstract><p>В работе показана возможность синтеза золькеталя из глицерина и ацетона под воздействием СВЧ (микроволнового) излучения в присутствии монтмориллонита, модифицированного водным раствором 0,25 моль/л HCl (0,25M HCl/MM). Реакция была изучена в растворе метанола при мольном отношении ацетон/глицерин равном 2,45–7,53, концентрации катализатора 1,2–2,8 мас.% (в расчете на массу загруженного глицерина) и температуре 30–56 °С. Показано, что золькеталь является основным продуктом с селективностью 96,1–99,2 %. Максимальный выход золькеталя 91,3 % при 98,6 % селективности был получен за 15 мин реакции при мольном отношении ацетон/глицерин равном 7,53, загрузке катализатора 2,3 мас.% (в расчете на массу загруженного глицерина) и 56 °С. Проведено сравнение каталитических свойств 0,25M HCl/MM в реакции в условиях СВЧ и термического нагрева. Показано, что выход золькеталя в реакции под действием СВЧ-излучения в 2 раза выше по сравнению с процессом в условиях термического нагрева.</p></abstract><trans-abstract xml:lang="en"><p>Herein, microwave-assisted synthesis of solketal from glycerol and acetone in the presence of montmorillonite modified with aqueous solution of 0.25 mol/l HCl (0.25M HCl/MM) was demonstrated. The reaction was studied in a methanol solution at an acetone/glycerol molar ratio of 2.45–7.53, a catalyst concentration of 1.2–2.8 wt.% (based on the mass of loaded glycerol), and 30–56 °C. Solketal was shown to be the major product with 96.1–99.2 % selectivity. The maximum solketal yield of 91.3 % with 98.6 % selectivity was obtained in 15 min of the reaction at an acetone/glycerol molar ratio of 7.53, a catalyst loading of 2.3 wt.% and 56 °C. The catalytic properties of 0.25M HCl/MM in the reaction under MW heating and thermal conventional heating were compared. It was found that the yield of solketal in the MW-assisted synthesis is 2 times higher compared to the process with conventional heating.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>СВЧ-излучение</kwd><kwd>золькеталь</kwd><kwd>глицерин</kwd><kwd>ацетон</kwd><kwd>монтмориллонит</kwd><kwd>кислотная активация</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Microwave-assisted synthesis</kwd><kwd>solketal</kwd><kwd>glycerol</kwd><kwd>acetone</kwd><kwd>montmorillonite</kwd><kwd>modification with acid</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">Checa M., Nogales-Delgado S., Montes V., Encinar J.M. Recent advances in glycerol catalytic valorization: A review // Catalysts. 2020. V. 10. № 1279. https://doi.org/10.3390/catal10111279</mixed-citation><mixed-citation xml:lang="en">Checa M., Nogales-Delgado S., Montes V., Encinar J.M. Recent advances in glycerol catalytic valorization: A review // Catalysts. 2020. V. 10. № 1279. https://doi.org/10.3390/catal10111279</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Bagnato G., Iulianelli A., Sanna A., Basile A. Glycerol рroduction and transformation: A critical review with particular emphasis on glycerol reforming reaction for producing hydrogen in conventional and membrane reactors // Membranes. 2017. V. 7. Art. 17. https://doi.org/10.3390/membranes7020017</mixed-citation><mixed-citation xml:lang="en">Bagnato G., Iulianelli A., Sanna A., Basile A. Glycerol рroduction and transformation: A critical review with particular emphasis on glycerol reforming reaction for producing hydrogen in conventional and membrane reactors // Membranes. 2017. V. 7. Art. 17. https://doi.org/10.3390/membranes7020017</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Nanda M.R., Yuan Z., Qin W., Xu C. (Charles). Recent advancements in catalytic conversion of glycerol into propylene glycol: A review // Catalysis Reviews. 2016. V. 8. № 3. P. 309—336. https://doi.org/10.1080/01614940.2016.1166005</mixed-citation><mixed-citation xml:lang="en">Nanda M.R., Yuan Z., Qin W., Xu C. (Charles). Recent advancements in catalytic conversion of glycerol into propylene glycol: A review // Catalysis Reviews. 2016. V. 8. № 3. P. 309—336. https://doi.org/10.1080/01614940.2016.1166005</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Максимов А.Л., Нехаев А.И., Рамазанов Д.Н. Простые эфиры и ацетали — перспективные продукты нефтехимии из возобновляемого сырья (обзор) // Нефтехимия. 2015. Т. 55. № 1. С. 3—24. https://doi.org/10.7868/S0028242115010104</mixed-citation><mixed-citation xml:lang="en">Максимов А.Л., Нехаев А.И., Рамазанов Д.Н. Простые эфиры и ацетали — перспективные продукты нефтехимии из возобновляемого сырья (обзор) // Нефтехимия. 2015. Т. 55. № 1. С. 3—24. https://doi.org/10.7868/S0028242115010104</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Correa I., Faria R.P.V., Rodrigues A.E. Continuous valorization of glycerol into solketal: Recent advances on catalysts, processes, and industrial perspectives // Sustain. Chem. 2021. V. 2. P. 286— 324. https://doi.org/10.3390/suschem2020017</mixed-citation><mixed-citation xml:lang="en">Correa I., Faria R.P.V., Rodrigues A.E. Continuous valorization of glycerol into solketal: Recent advances on catalysts, processes, and industrial perspectives // Sustain. Chem. 2021. V. 2. P. 286— 324. https://doi.org/10.3390/suschem2020017</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Mota C.J.A., Silva C.X.A., Rosenbach N.J., Costa J., Silva F. Glycerin derivatives as fuel additives: the addition of glycerol/ acetone ketal(solketal) in gasolines // Energy Fuels. 2010. V. 24. Р. 2733—2736. https://doi.org/10.1021/ef9015735</mixed-citation><mixed-citation xml:lang="en">Mota C.J.A., Silva C.X.A., Rosenbach N.J., Costa J., Silva F. Glycerin derivatives as fuel additives: the addition of glycerol/ acetone ketal(solketal) in gasolines // Energy Fuels. 2010. V. 24. Р. 2733—2736. https://doi.org/10.1021/ef9015735</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Патент US 20090270643 А1, опубл. 29.10.2009; US 6890364 В2, опубл. 10.05.2005.</mixed-citation><mixed-citation xml:lang="en">Патент US 20090270643 А1, опубл. 29.10.2009; US 6890364 В2, опубл. 10.05.2005.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Патент RU 2365617 опубл. 27.08.2009; ЕА 018090, опубл. 30.05.2013; ЕР 2298851, опубл. 08.10.2014.</mixed-citation><mixed-citation xml:lang="en">Патент RU 2365617 опубл. 27.08.2009; ЕА 018090, опубл. 30.05.2013; ЕР 2298851, опубл. 08.10.2014.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Data Bridge Market Research https://www.databridgemarketresearch.com/reports/global-solketal-market</mixed-citation><mixed-citation xml:lang="en">Data Bridge Market Research https://www.databridgemarketresearch.com/reports/global-solketal-market</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Amri S., Gómez J., Balea A., Merayo N., Srasra E., Besbes N., Ladero M. Green production of glycerol ketals with a clay-based heterogeneous acid // Catalyst. Appl. Sci. 2019. V. 9. Art. 4488. https://doi.org/10.3390/app9214488</mixed-citation><mixed-citation xml:lang="en">Amri S., Gómez J., Balea A., Merayo N., Srasra E., Besbes N., Ladero M. Green production of glycerol ketals with a clay-based heterogeneous acid // Catalyst. Appl. Sci. 2019. V. 9. Art. 4488. https://doi.org/10.3390/app9214488</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Timofeeva M.N., Panchenko V.N., Krupskaya V.V., Gil A., Vicente M.A. Effect of nitric acid modification of montmorillonite montmorillonite clay on synthesis of solketal from glycerol and acetone // Catal. Commun. 2017. V. 90. P. 65—69. https://doi.org/10.1016/j.catcom.2016.11.020</mixed-citation><mixed-citation xml:lang="en">Timofeeva M.N., Panchenko V.N., Krupskaya V.V., Gil A., Vicente M.A. Effect of nitric acid modification of montmorillonite montmorillonite clay on synthesis of solketal from glycerol and acetone // Catal. Commun. 2017. V. 90. P. 65—69. https://doi.org/10.1016/j.catcom.2016.11.020</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Коваленко О.Н., Сименцова И.И., Панченко В.Н., Тимофеева М.Н. Кислотная активация как способ регулирования каталитических свойств монтмориллонита в реакции синтеза золькеталя из глицерина и ацетона // Катализ в промышленности. 2022. T. 22. № 1. С. 57—66. https://doi.org/10.18412/1816-0387-2022-1-57-66</mixed-citation><mixed-citation xml:lang="en">Коваленко О.Н., Сименцова И.И., Панченко В.Н., Тимофеева М.Н. Кислотная активация как способ регулирования каталитических свойств монтмориллонита в реакции синтеза золькеталя из глицерина и ацетона // Катализ в промышленности. 2022. T. 22. № 1. С. 57—66. https://doi.org/10.18412/1816-0387-2022-1-57-66</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Horikoshi S., Serpone N. Microwaves in catalysis: methodology and applications. John Wiley &amp; Sons, 2015.</mixed-citation><mixed-citation xml:lang="en">Horikoshi S., Serpone N. Microwaves in catalysis: methodology and applications. John Wiley &amp; Sons, 2015.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Aguado-Deblas L., Estevez R., Russo M., La Parola V., Bautista F.M., Testa M.L. Sustainable microwave-assisted solketal synthesis over sulfonic silica-based catalysts // J. Environ. Chem. Eng. 2022. V. 10. Art. 108628. https://doi.org/10.1016/j.jece.2022.108628</mixed-citation><mixed-citation xml:lang="en">Aguado-Deblas L., Estevez R., Russo M., La Parola V., Bautista F.M., Testa M.L. Sustainable microwave-assisted solketal synthesis over sulfonic silica-based catalysts // J. Environ. Chem. Eng. 2022. V. 10. Art. 108628. https://doi.org/10.1016/j.jece.2022.108628</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Priya S.S., Selvakannana P.R., Chary K.V.R., Kantam M.L., Bhargava S.K. Solvent-free microwave-assisted synthesis of solketal from glycerolusing transition metal ions promoted mordenite solid acid catalysts // Mol. Catal., 2017. V. 434. P. 184—193. http://dx.doi.org/10.1016/j.mcat.2017.03.001</mixed-citation><mixed-citation xml:lang="en">Priya S.S., Selvakannana P.R., Chary K.V.R., Kantam M.L., Bhargava S.K. Solvent-free microwave-assisted synthesis of solketal from glycerolusing transition metal ions promoted mordenite solid acid catalysts // Mol. Catal., 2017. V. 434. P. 184—193. http://dx.doi.org/10.1016/j.mcat.2017.03.001</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Filho E.G.R.T.,•Dall’Oglio E.L., de Sousa P.T. (Jr.), Ribeiro F., Marques M.Z., de Vasconcelos L.G., de Amorim M.P.N., Kuhnen C.A. Solketal production in microwave monomode batch reactor: the role of dielectric properties in glycerol ketalization with acetone // Braz. J. Chem. Eng. 2022. V. 39. P. 691—703. https://doi.org/10.1007/ s43153-021-00206-2</mixed-citation><mixed-citation xml:lang="en">Filho E.G.R.T.,•Dall’Oglio E.L., de Sousa P.T. (Jr.), Ribeiro F., Marques M.Z., de Vasconcelos L.G., de Amorim M.P.N., Kuhnen C.A. Solketal production in microwave monomode batch reactor: the role of dielectric properties in glycerol ketalization with acetone // Braz. J. Chem. Eng. 2022. V. 39. P. 691—703. https://doi.org/10.1007/ s43153-021-00206-2</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Ao S., Alghamdi L.A., Kress T., Selvaraj M., Halder G., Wheatley A.E.H., Rokhum S.L. Microwave-assisted valorization of glycerol to solketal using biomass-derived heterogeneous catalyst // Fuel. 2023. V. 345. Art. 128190. https://doi.org/10.1016/j.fuel.2023.128190</mixed-citation><mixed-citation xml:lang="en">Ao S., Alghamdi L.A., Kress T., Selvaraj M., Halder G., Wheatley A.E.H., Rokhum S.L. Microwave-assisted valorization of glycerol to solketal using biomass-derived heterogeneous catalyst // Fuel. 2023. V. 345. Art. 128190. https://doi.org/10.1016/j.fuel.2023.128190</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Prasad K.S., Shamshuddin S.Z.M., Pratap S.R. Microwave synthesis of fuel additive over modified amorphous aluminophosphate // Kinetics, Chem. Data Collect. 2022. V. 38. Art. 100818. https://doi.org/10.1016/j.cdc.2021.100818</mixed-citation><mixed-citation xml:lang="en">Prasad K.S., Shamshuddin S.Z.M., Pratap S.R. Microwave synthesis of fuel additive over modified amorphous aluminophosphate // Kinetics, Chem. Data Collect. 2022. V. 38. Art. 100818. https://doi.org/10.1016/j.cdc.2021.100818</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Черноусов Ю.Д., Шеболаев И.В., Иванников В.И., Икрянов И.М., Болотов В.А., Танашев Ю.Ю. Установка для проведения химических реакций со сверхвысокочастотным нагревом реагентов // Приборы и техника эксперимента. 2019. № 2. С. 136—141. https://doi.org/10.1134/S0032816219020046</mixed-citation><mixed-citation xml:lang="en">Черноусов Ю.Д., Шеболаев И.В., Иванников В.И., Икрянов И.М., Болотов В.А., Танашев Ю.Ю. Установка для проведения химических реакций со сверхвысокочастотным нагревом реагентов // Приборы и техника эксперимента. 2019. № 2. С. 136—141. https://doi.org/10.1134/S0032816219020046</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Olphen H.V., Fripiat J.J. Data handbook for clay materials and other non-metallic // Minerals. 1999. V. 131. № 1. P. 285—337. https://doi.org/10.1346/CCMN.1980.0280215</mixed-citation><mixed-citation xml:lang="en">Olphen H.V., Fripiat J.J. Data handbook for clay materials and other non-metallic // Minerals. 1999. V. 131. № 1. P. 285—337. https://doi.org/10.1346/CCMN.1980.0280215</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Da Silva C.X.A., Mota C.J.A. The influence of impurities on the acid-catalyzed reaction of glycerol with acetone // Biomass Bioenergy. 2011. V. 35. № 8. P. 3547—3551. https://doi.org/10.1016/j.biombioe.2011.05.004</mixed-citation><mixed-citation xml:lang="en">Da Silva C.X.A., Mota C.J.A. The influence of impurities on the acid-catalyzed reaction of glycerol with acetone // Biomass Bioenergy. 2011. V. 35. № 8. P. 3547—3551. https://doi.org/10.1016/j.biombioe.2011.05.004</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Moreira M.N., Faria R.P.V., Ribeiro A.M., Rodrigues A.E. Solketal production from glycerol ketalization with acetone: Catalyst selection and thermodynamic and kinetic reaction study // Ind. Eng. Chem. Res. 2019. V. 58. P. 17746—17759. https://doi.org/ 10.1021/acs.iecr.9b03725</mixed-citation><mixed-citation xml:lang="en">Moreira M.N., Faria R.P.V., Ribeiro A.M., Rodrigues A.E. Solketal production from glycerol ketalization with acetone: Catalyst selection and thermodynamic and kinetic reaction study // Ind. Eng. Chem. Res. 2019. V. 58. P. 17746—17759. https://doi.org/ 10.1021/acs.iecr.9b03725</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Милованов О.С., Собенин Н.П. Техника сверхвысоких частот. М.: Атомиздат, 1980. 464 с.</mixed-citation><mixed-citation xml:lang="en">Милованов О.С., Собенин Н.П. Техника сверхвысоких частот. М.: Атомиздат, 1980. 464 с.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
