chemicallytechFine Chemical TechnologiesТонкие химические технологии2410-65932686-7575MIREA – Russian Technological University (RTU MIREA).10.32362/2410-6593-2024-19-6-547-554WTSOXPchemicallytech-2197Research ArticleCHEMISTRY AND TECHNOLOGY OF INORGANIC MATERIALSХИМИЯ И ТЕХНОЛОГИЯ НЕОРГАНИЧЕСКИХ МАТЕРИАЛОВHighly dispersed chromium(III) molybdate powders obtained by solid phase synthesisВысокодисперсные порошки молибдата хрома(III), полученные твердофазным синтезомhttps://orcid.org/0000-0002-5925-4561МирошниченкоМ. Н.MiroshnichenkoM. N.

Мирошниченко Марина Николаевна, к.т.н., научный сотрудник

184209, г. Апатиты, Мурманская обл., Академгородок, д. 26а

ResearcherID Р-9964-2017, Scopus Author ID 8522192100

Marina N. Miroshnichenko, Cand. Sci. (Eng.), Researcher

26а, Akademgorodok, Apatity, Murmansk oblast, 184209

ResearcherID Р-9964-2017, Scopus Author ID 8522192100

m.miroshnichenko@ksc.ruhttps://orcid.org/0000-0002-4749-236XКолосовВ. Н.KolosovV. N.

Колосов Валерий Николаевич, д.т.н., главный научный сотрудник

184209, г. Апатиты, Мурманская обл., Академгородок, д. 26а

ResearcherID Q-8446-2017, Scopus Author ID 35275498200

Valery N. Kolosov, Dr. Sci. (Eng.), Chief Researcher

26а, Akademgorodok, Apatity, Murmansk oblast, 184209

ResearcherID Q-8446-2017, Scopus Author ID 35275498200

v.kolosov@ksc.ruИнститут химии и технологии редких элементов и минерального сырья им. И.В.Тананаева – обособленное подразделение Федерального государственного бюджетного учреждения науки Федерального исследовательского центра «Кольский научный центр Российской академии наук»РоссияTananaev Institute of Chemistry – Subdivision of the Federal Research Center “Kola Science Center of the Russian Academy of Sciences”Russian Federation202419012025196547554Copyright © Miroshnichenko M.N., Kolosov V.N., 20252025Мирошниченко М.Н., Колосов В.Н.Miroshnichenko M.N., Kolosov V.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.finechem-mirea.ru/jour/article/view/2197

Objectives. To obtain highly dispersed powders of chromium(III) molybdate Cr2(MoO4)3 by solid phase synthesis and to study their porous structure.Methods. After stirring in water, a mixture of Cr2O3 and MoO3 oxide powders was dried in air and subjected to heat treatment in the temperature range of 600–800°C. After heat treatment, the products were identified by X-ray phase and sedimentation analysis. The specific surface area was measured using the Brunauer–Emmett–Teller static adsorption method. Porosity parameters were measured using the Barrett–Joyner–Halenda (BJH) method.Results. The Gibbs free energy ΔG of the reaction between chromium and molybdenum oxides was calculated and it was shown that the process is characterized by a significant negative value of ΔG. Concurrently, the Gibbs energy exhibits a relatively weak dependence on temperature. The highly dispersed chromium(III) molybdate powders with specific surface area of 15.3–29.7 m2·g−1 obtained in this way were pure according to X-ray diffraction analysis. A study of the volume, diameter, and pore size distribution was conducted through the utilization of nitrogen adsorption–desorption isotherms in accordance with the BJH model.Conclusions. It was demonstrated that Cr2(MoO4)3 powders possess a mesoporous structure and are distinguished by a bimodal pore system comprising small pores with a diameter of 2–3 nm and larger pores with a diameter ranging from 15 to 30 nm.

Цели. Получить высокодисперсные порошки молибдата хрома(III) Cr2(MoO4)3твердофазным синтезом и исследовать их пористую структуру.Методы. Смесь порошков оксидов Cr2O3 и MoO3 после перемешивания в воде просушивали на воздухе и подвергали термообработке в температурном интервале 600–800°С. После термообработки продукты идентифицировали методами рентгенофазового и седиментационного анализа. Величину удельной поверхности измеряли адсорбционным статическим методом Брунауэра–Эммета–Теллера, а параметры пористости — методом Баррета–Джойнера–Халенды (BJH, Barrett–Joyner–Halenda).Результаты. Рассчитана свободная энергия Гиббса ΔG реакции между оксидами хрома(III) и молибдена(VI). Показано, что процесс характеризуется значительной отрицательной величиной ΔG. При этом энергия Гиббса слабо зависит от температуры. Получены чистые по данным рентгеновского анализа высокодисперсные порошки молибдата хрома(III) с удельной поверхностью 15.3–29.7 м2·г−1. С использованием изотерм адсорбции–десорбции азота при помощи модели BJH исследованы объем, диаметр и распределение пор по размерам.Выводы. Показано, что порошки Cr2(MoO4)3 имеют мезопористую структуру и характеризуются бимодальной системой пор, состоящей из небольших пор с размерами 2–3 нм и более крупных пор с размерами от 15 до 30 нм.

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