PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Volume LXVI 2021

Olena MAKIDO, Galyna KHOVANETS’, Oksana KHAVUNKO

Department of Physical Chemistry of Fossil Fuels of the Institute of Physical-Organic Chemistry and Coal Chemistry named after L.M. Lytvynenko NAS of Ukraine, Naukova Str., 3а, 79060 Lviv, Ukraine
e-mail: khovanets_galyna@ukr.net

DOI: https://doi.org/10.37827/ntsh.chem.2021.66.090

SYNTHESIS OF CATALYSTS BASED ON MAGNETIC PARTICLES CoFe2O4

The development of effective catalysts for various industrial production processes, to protect the environment from hazardous pollutants, in particular, fine treatment of wastewater from organic pollutants by the Fenton method is a very relevant modern direction of catalysis – «green chemistry». Therefore, we have obtained magnetic-sensitive core-shell catalysts based on stabilized SiO2 particles of cobalt ferrite with active centers of copper oxide deposited on the surface by the sol-gel method. Such porous catalysts with magnetic properties have a number of advantages: good adsorption capacity, the possibility of magnetic separation and recirculation at room temperature and thermal stability. Multistage technology for manufacturing of CoFe2O4/SiO2/CuO composite is proposed. Synthesis of the obtained nanostructured magnetically sensitive catalysts CoFe2O4/SiO2/CuO occurs in three stages: 1) synthesis of CoFe2O4 particles, which form a magnetically sensitive core; 2) applying a stabilizing layer of silica by sol-gel method; 3) the formation of an outer layer of CuO, which exhibits catalytic properties. Carried out qualitative and quantitative microanalysis of the obtained composite showed that the particles of cobalt ferrite have a finely dispersed structure with sizes up to 100 μm. Sequential deposition of the following layers of SiO2 and CuO on the surface of CoFe2O4 leads to an increase in the size of the particles while maintaining their developed surface. The catalytic action of the obtained CoFe2O4/SiO2/CuO composite in the process of the initiated oxidation of cumene was investigated. Oxidation of cumene was performed without catalyst and using CoFe2O4/SiO2/CuO composite as catalyst. The use of CoFe2O4/SiO2/CuO as a catalyst allows to increase the rate of oxidation process by an order. At the same time there is a direct dependence of the growth rate of the reaction on the amount of the involved catalyst. Also, this catalyst demonstrated the ability to work without loss of catalytic activity of several cycles without regeneration. The catalyst CoFe2O4/SiO2/CuO is promising for use in the oxidation processes of hydrocarbons.

Keywords: heterogeneous catalysis; sol-gel synthesis; core-shell type catalysts; TEOS; initiated oxidation of cumene.

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How to Cite

MAKIDO O., KHOVANETS’ G., KHAVUNKO O. SYNTHESIS OF CATALYSTS BASED ON MAGNETIC PARTICLES CoFe2O4. Proc. Shevchenko Sci. Soc. Chem. Sci. 2021 Vol. LXVI. P. 90-97.

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