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Structural and chemical transformations in the liquid phase during high-energy milling of Al and Mg powders with heptaneстатья
- Авторы: Aksenova V.V., Kanunnikova O.M., Ladyanov V.I.
- Журнал: Inorganic Materials: Applied Research
- Том: 16
- Номер: 3
- Год издания: 2025
- Первая страница: 776
- Последняя страница: 783
- DOI: 10.1134/S2075113325700650
- Аннотация: Samples of Al + heptane and Mg + heptane mixtures mechanically activated in a planetary ball mill were obtained. The influence of the metal and the speed of rotation of the mill carrier on the transformations in the liquid organic phase was investigated. The structural and chemical composition of the liquid phase at successive stages of mechanochemical activation (MA) was studied using IR and UV spectroscopy methods. It was established that the deformation-induced decomposition of heptane during MA is accompanied by isomerization of normal alkanes, cyclization reactions, dehydrogenation, and hydrogenation. It was shown that the intensity of mechanochemical cracking and the rate of chemical transformations depend on the nature of the metal being milled in the organic medium. During MA, there is selective absorption of hydrocarbon decomposition products by the metal powder, leading to the formation of carbides and hydrides. The method of thermodesorption of hydrogen from the milled powders demonstrated that, under MA conditions, magnesium powder absorbs twice as much hydrogen as aluminum powder. The intense absorption of hydrogen by magnesium powder slows down the reactions in the organic phase, while in the presence of aluminum, chemical transformations in the liquid phase continue throughout the entire mechanochemical processing. Increasing the speed of rotation of the mill carrier significantly accelerates the structural and chemical transformations in the organic phase, with an increased proportion of aliphatic isoalkanes and alkylbenzenes in the decomposition products of heptane.
- Добавил в систему: Аксенова Валерия Викторовна