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ArticleName Use of electrogenerated reagents to produce complex oxide systems with aluminium
DOI 10.17580/tsm.2020.07.08
ArticleAuthor Petrova E. V., Dresvyannikov A. F., Khayrullina A. I., Kashfrazyeva L. I.

Kazan National Research Technological University, Kazan, Russia:

E. V. Petrova, Professor at the Department of Analytical Chemistry, Certification and Quality Management, Doctor of Chemical Sciences, Associate Professor, e-mail:
A. F. Dresvyannikov, Head of the Department of Electrochemical Technology, Doctor of Chemical Sciences, Professor
A. I. Khayrullina, Assistant Lecturer, Department of Electrochemical Technology
L. I. Kashfrazyeva, Postgraduate Student, Department of Analytical Chemistry, Certification and Quality Management


This paper focuses on the development of solutions to find methods that would enable to obtain complex oxide systems of Al2O3 – ZrO2 – MexOy (Me = Mg, La) with aluminium using electrogenerated reagents in a special hydrodynamic mode of an undivided coaxial cell with a great difference in the electrode area. With the help of electron microscopy, X-ray phase analysis and laser diffraction, the morphology and phase composition of the oxide systems Al2O3 – ZrO2 – MexOy were studied. The authors also looked at the processes involved in the formation of precursors of complex aluminium and zirconium oxide systems in the environment of electrogenerated
reagents being rapidly stirred (which is possible in an undivided coaxial cell) and amid phase transformations of the products. It is demonstrated that the particle morphology of aluminium oxide doped with zirconium, magnesium and lanthanum oxides is governed by the production environment. The average size of such particles is 20–80 nm. The authors established the environment in which the complex hydroxide of Mg7Al4(OН)22 is formed. This hydroxide produces an Al2MgO4 spinel, which serves to stabilize α-Al2O3 and the tetragonal zirconium oxide t-ZrO2. The latter maintains stability in a broad temperature range in the complex oxide system of Al2O3 – ZrO2 – MgO. Through experiment it was proved that the introduction of La3+ in the Al2O3 – ZrO2 – MgO system by adding cations of La (III) in the electrolyte and through soluble aluminium anode electrolysis would result in cubic and tetragonal phases of zirconium oxide forming in the heat treated product, as well as lanthanum aluminate forming in it. The established regularities can help predict the effect of the process environment on the particle size and morphology, the phase and chemical compositions of the Al2O3 – ZrO2 – MexOy, oxide systems, and, consequently, on the physical and chemical properties of the latter.
This research study was carried out using the facilities of the Shared Knowledge Centre for Nanomaterials & Nanotechnologies under the governmental assignment of the Ministry of Education and Science of the Russian Federation for 2020–2022, project: Catalysis in Petroleum Refining and Oil and Gas Chemistry.

keywords Oxide systems with aluminium, electrogenerated reagents, phase composition, zirconium, magnesium, lanthanum, precursor ceramics

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