Abstract
Cobalt ferrite (CoFe2O4) nanoparticles were synthesized and investigated as a catalyst in the reaction of nitrous oxide (N2O) decomposition. Cobalt ferrite was synthesized by solid–phase interaction at 1100 °C and by preliminary mechanochemical activation in a roller-ring vibrating mill at 400 °C. The nanoparticles were characterized by X-ray diffraction (XRD), synchronous thermal analysis (TG and DSC) and scanning electron microscopy (SEM). A low-temperature nitrogen adsorption/desorption test was used to evaluate the catalytic activity of the cobalt ferrite nanoparticles. Correlations between the structure and catalytic properties of the catalysts are reported. The highest catalytic activity of CoFe2O4 in the reaction of nitrous oxide decomposition was 98.1% at 475 °C for cobalt ferrite obtained by mechanochemical activation.
Highlights
Correlations between the structure and catalytic properties of the catalysts are reported
The preliminary mechanochemical treatment of the initial components makes it possible to decrease the temperature of the synthesis of monophasic cobalt ferrite three times compared with the solid–phase interaction of ones that have not been preactivated
Since the formation of new phases does not occur during mechanochemical activation, it is obvious that the main channel of relaxation of the supplied energy is the accumulation of defects in the structure of iron and cobalt oxalates, which in turn leads to the intensification of their decomposition processes
Summary
Cobalt ferrite attracts the attention of many researchers for its unique properties that allow this compound to be used in various industries. Ferrites, used as catalysts, should have a high surface area and a developed porous structure, as well as the necessary combination of structural and mechanical properties. These properties of the product mainly depend on the method of its synthesis. A promising direction of their use is the process of gas emissions neutralizing, since they can successfully replace the catalysts containing noble metals such as platinum, palladium, or gold [29] These facts make cobalt ferrite a promising material that can be widely used. The aim of the investigation was to study the system CoC2 O4 ·2H2 OFeC2 O4 ·2H2 O during mechanical activation and heat treatment, as well as to identify the structural, physicochemical and catalytic properties of the cobalt ferrites in the N2 O decomposition reaction
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