najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2023-14-6-672-678najo-159Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХFormation of the metal-oxide nanocomposites during the partial reduction of Nd-Sr nickelatesОбразование металл-оксидных нанокомпозитов при частичном восстановлении никелатов неодима-стронцияhttps://orcid.org/0009-0005-0132-4466МалышевС. А.MalyshevS. A.

Sergey A. Malyshev - Department of Chemistry

119991 Moscow

malyshev12sa@yandex.ruhttps://orcid.org/0000-0001-8362-1002ШляхтинО. А.ShlyakhtinO. A.

Oleg A. Shlyakhtin - Department of Chemistry

119991 Moscow

oleg@inorg.chem.msu.ruhttps://orcid.org/0009-0002-4855-7935ТимофеевГ. М.TimofeevG. M.

Grigorii M. Timofeev - Department of Chemistry

119991 Moscow

timofeevg@inbox.ruhttps://orcid.org/0000-0001-7036-5927МазоГ. Н.MazoG. N.

Galina N. Mazo - Department of Chemistry

119991 Moscow

mazo@inorg.chem.msu.ruhttps://orcid.org/0000-0002-9958-6659РосляковИ. В.RoslyakovI. V.

Ilya V. Roslyakov

119991 Moscow

Ilya.roslyakov@gmail.comhttps://orcid.org/0000-0003-4108-9040ВасильевА. В.VasilievA. V.

Aleksander V. Vasiliev - Department of Chemistry

119991 Moscow

a.vasiliev@inorg.chem.msu.ruhttps://orcid.org/0000-0002-4304-8624ШаталоваТ. Б.ShatalovaT. B.

Tatiana B. Shatalova – Department of Chemistry

119991 Moscow

shatalovatb@gmail.comhttps://orcid.org/0000-0003-0869-8784КустовА. Л.KustovA. L.

Aleksander L. Kustov – Department of Chemistry

119991 Moscow

kyst@list.ruDepartment of Chemistry, M. V. Lomonosov Moscow State UniversityChinaDepartment of Materials Sciences, M. V. Lomonosov Moscow State University; N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of SciencesRussian Federation202302062025146672678Copyright © Malyshev S.A., Shlyakhtin O.A., Timofeev G.M., Mazo G.N., Roslyakov I.V., Vasiliev A.V., Shatalova T.B., Kustov A.L., 20252025Малышев С.А., Шляхтин О.А., Тимофеев Г.М., Мазо Г.Н., Росляков И.В., Васильев А.В., Шаталова Т.Б., Кустов А.Л.Malyshev S.A., Shlyakhtin O.A., Timofeev G.M., Mazo G.N., Roslyakov I.V., Vasiliev A.V., Shatalova T.B., Kustov A.L.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/159

A thermal reduction of Nd2-xSrxNiO4􀀀 (x = 0–1.4) solid solutions in an Ar/H2 gas mixture occurs in several separate stages. The initial stages of reduction presumably related to the reduction of Ni3+ to Ni2+ cause only minor changes in the initial K2NiF4 type structure and retain the morphology of the complex oxide particles. Occasionally, this process is accompanied by the appearance of Ni metal nanoparticles at the surface of oxide grains. As-obtained Ni/metal oxide nanocomposites similar to the products of redox exsolution demonstrate noticeable catalytic activity in the reaction of CO2 hydrogenation at T = 350–400C.

Термическое восстановление твердых растворов Nd2-xSrxNiO4- (x = 0 - 1.4) в аргоноводородной смеси протекает в несколько раздельных стадий. Начальные стадии восстановления, по-видимому, связанные с восстановлением Ni3+ до Ni2 , сопровождаются минимальными изменениями первоначальной структуры типа K2NiF4 при отсутствии изменений морфологии оксидных частиц. Необычным является одновременное появление наночастиц металлического никеля на поверхности оксидных продуктов восстановления. Образующиеся таким образом никель-оксидные нанокомпозиты, сходные с продуктами высокотемпературного частичного восстановления некоторых сложных оксидов (redox exsolution), проявляют значимую каталитическую активность в процессах восстановления CO2 при T = 350-400C.

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The authors declare that there are no conflicts of interest present.