SYNTHESIS AND PROPERTIES OF MAGNETIC COMPOSITE Fe3O4 STABILIZED BY POLYMERS FOR CATALYTIC OXIDATION OF AROMATIC HYDROCARBONS
Shakiyeva T.V. Sassykova L.R. Dossumova B.T. Ilmuratova M.S. Dzhatkambayeva U.N. Sendilvelan S.
October-December 2024Rasayan Journal of Chemistry, c/o Dr. Pratima Sharma
Rasayan Journal of Chemistry
2024#17Issue 41746 - 1753 pp.
The present study is aimed at creating catalytic systems based on magnetite (Fe3O4) stabilized by polymers (polyvinylpyrrolidone (PVP) and chitosan), for liquid-phase oxidation of organic compounds with gaseous oxygen in order to obtain oxygen-containing compounds that can be used in the production of dyes, synthetic fibers, drugs, and many other petrochemical products. Magnetic composites of Fe3O4 stabilized by PVP and chitosan were synthesized by the coprecipitation method. The prepared magnetic composites were studied by physicochemical analysis methods. It was found that surface stabilization with polymers leads to a decrease in the size of magnetite nanocrystallites in nanocomposites. The sizes of the studied composites are less than ∼ 10 nm. Mössbauer spectra of the obtained Fe3O4, Fe3O4/PVP, and Fe3O4/chitosan composite catalysts showed the presence of trivalent iron ions in a tetrahedral environment and the presence of Fe2+ and Fe3+ in an octahedral environment, as well as a doublet spectrum. The possibilities of using magnetite-based composite catalysts for heterogeneous liquid-phase oxidation of para-xylene with oxygen are considered. Based on the analysis of the IR spectra of the final reaction samples, the presence of CH bonds in the aromatic ring and C=C double bonds, as well as valence vibrations of the C=O group of carbonyl compounds and vibrations of the bonds of hydroxyl groups was established. It is shown that the main products of the oxidation reaction of p-xylene are p-toluyl aldehyde and dibutyl phthalate, which can be widely used for basic organic synthesis. The authors concluded that the magnetic composite of the Fe3O4/PVP composition can be used to produce oxygen-containing compounds, in particular, toluyl aldehyde and dibutyl phthalate.
Aromatic Hydrocarbons , Catalysts , Chitosan , Oxidation , P-Xylene , Polyvinylpyrrolidone
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Al-Farabi Kazakh National University, Center of Physical-Chemical Methods of Research and Analysis, Almaty, 050012, Kazakhstan
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Department of Mechanical Engineering, Dr. M.G.R. Educational and Research Institute, University, Tamilnadu, Chennai, 600095, India
Al-Farabi Kazakh National University
Al-Farabi Kazakh National University
Department of Mechanical Engineering
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