Production of Cr₂O₃/TiO₂--SiO₂ Core-Shell Hollow Composite Material in the Form of Spherical Granules

Abstract

A method of preparation of a core-shell hollow Cr₂O₃/TiO₂--SiO₂ composite material in the form of spherical granules is proposed. This method combines the templat and sol-gel methods of synthesis of oxide composites. In contrast to previous studies, macro-porous cationite TOKEM-250 with acryl-divenyl-benzene matrix and carboxyl functional groups in sodium form was used as a templat to obtain such composites. The using of such structure and form of cationite made it possible to obtain strong granules possessing catalytic activity in the reaction of para-xylene combustion. Time and temperature conditionsof decomposition of TOKEHM-250 cationite saturated with Cr³⁺ cations and seasoned in ash based on tetrabutoxytitan and tetraethoxysilane were developed. This makes it possible to form strong hollow spherical granules of the composite material. The solid Cr₂O₃/TiO₂--SiO₂ composite is formed at a temperature of at least 500 °C and a furnace heating rate of 5 °C/min. X-ray diffraction and micro-X-ray diffraction analyses showed that the core of the spherical granules was chromium(III) oxide with the corundum structure and the shell was an X-ray amorphous mixture of titanium(IV) oxide and silicon(IV) oxide. The more even distribution of the shell is achieved by increasing the silicon dioxide content. The obtained hollow core-shell composite materials of Cr₂O₃/TiO₂--SiO₂ type in the form of spherical granules of 0.3 to 0.8 mm in size are characterized by specific surface area of 4.3 and 6.1 m²/g depending on the silicon dioxide content in the shell. Such materials exhibit catalytic activity in the para-xylene oxidation reaction. Maximum conversion of para-xylene on Cr₂O₃/TiO₂--SiO₂ composite with the content of silicon dioxide 20 mol. % is reached at temperature 350 °C and makes 100 %

The work was carried out within the framework of a state assignment Ministry of Education and Science of Russian Federation (project no. FSWM-2020-0037)

Please cite this article in English as:

Khalipova O.S., Kuznetsova S.A., Selyunina L.A., et al. Production of Cr₂O₃/TiO₂--SiO₂ core-shell hollow composite material in the form of spherical granules. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2023, no. 5 (110), pp. 154--169 (in Russ.). DOI: https://doi.org/10.18698/1812-3368-2023-5-154-169

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