Abstract
A novel synthetic approach is proposed to the production of macroporous magnetic iron oxides and their iron aluminate composites for liquid-phase catalytic oxidation. The materials were prepared by sol–gel synthesis where metal precursors were mixed with a colloidal template solution based on siloxane–acrylate latex. The pore structure and magnetic properties of the composites were studied as functions of temperature and magnetic field. The effects of the heat treatment schedule on the phase composition, porosity, and catalytic properties of the materials were elucidated. The results are supported by scanning electron microscopy, X-ray powder diffraction analysis, nuclear gamma resonance, and low-temperature nitrogen adsorption. The addition of aluminum ions in the course of sol–gel (template) synthesis allows the materials to preserve their pore structure upon high-temperature treatment, thereby improving the catalytic properties and significantly affecting the magnetic characteristics of the resulting magnetic composites.
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ACKNOWLEDGMENTS
The authors are grateful to A.S. Kuchma (FEFU, Vladivostok) and employees of the Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences (Vladivostok) for interpritaion of the research results. The facilities of the Interdisciplinary Shared Facilities Center for Nanotechnologies and Advanced Functional Materials (Far East Federal University, Vladivostok, Russia) were used in the work and were financially supported by the FEFU Competitiveness Enhancement Program.
Funding
This study was fulfilled in the frame of the assignment of the Ministry of Science and Higher Education of the Russian Federation (theme No. 00657-2020-0006).
The experimental work on magnetic measurements of the developed materials and their analysis was supported by the Russian Science Foundation (project No. 19-72-20071).
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Papynov, E.K., Nomerovskii, A.D., Azon, A.S. et al. Macroporous Magnetic Iron Oxides and Their Composites for Liquid-Phase Catalytic Oxidation. Russ. J. Inorg. Chem. 65, 1642–1653 (2020). https://doi.org/10.1134/S0036023620110157
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DOI: https://doi.org/10.1134/S0036023620110157