Background: The study effect of microwave radiation on the catalytic properties of transition metal ferrites synthesized by ceramic and sol-gel methods, in the oxidation reaction of carbon monoxide into dioxide. Objective: The aim of this work is to study the effect of microwave radiation on the production of cobalt, copper, nickel and manganese ferrites by sol-gel combustion technology using various organic reagents and to study their catalytic activity in the oxidative conversion of carbon monoxide into dioxide. Methods: Microwave treatment was carried out on a setup based on an EM-G5593V microwave oven (Panasonic) with a magnetron power varying from 300 to 800 W with an operating frequency of 2450 MHz. X-ray phase analysis of the products was carried out on a Bruker D 2Phazer automatic diffractometer. The measurement of the specific surface area of the samples was determined by low-temperature nitrogen adsorption by the multipoint BET method on a SORBI-MS instrument (ZAO META, Russia). IR spectra were recorded using FT-IR LUMOS Bruker spectrometers. The micrographs of samples were analyzed on the Sigma VP (Carl Zeiss Jena) equipment. Results: It was determined that the most active catalysts for the oxidation of carbon monoxide to dioxide are ferrites obtained by the sol-gel combustion method using microwave radiation to "ignite" the gel. Conclusion: The use of microwave radiation in the preparation of ferrites by the sol-gel method with combustion can, in a very short time, measured in seconds, initiate a self-propagating exothermic combustion reaction in the entire volume of the sample. The catalytic activity in the oxidative conversion of carbon monoxide obtained by this method of ferrites comparable to the activity of ferrites obtained by the sol-gel method with traditional combustion.

This review considers recent work on the synthesis of transition metal ferrites (Co, Cu, Ni, Mn) by sol-gel method with combustion, as well as the effect of microwave radiation. Ferrites are interesting not only for magnetic and optical properties, but also for their catalytic properties. In recent years, there has been an in-creasing amount of literature, which investigates the catalytic properties of transition metal ferrites in various reactions, including oxidative reactions. Given the fact that various organic components are used as complex-ing agents and as a fuel in the sol-gel method with combustion, the review considers the influence of the or-ganic reagent nature, its ratio to precursors, the pH of the medium, the power and time of microwave expo-sure to the process of ferrite formation as factors influencing the size of formed particles and their textural characteristics, which are of great importance in the catalysis. Recently, the attention of chemists working in the field of catalysis has been attracted by studies of the effect of physical fields, to which the microwave field belongs, on various chemical processes, including the nanocatalysts synthesis. The use of microwave ra-diation in sol-gel synthesis of ferrite allows obtaining nanoferrites with high specific surface area. From this point of view, this paper considers the works of recent years devoted to the study of microwave sol-gel syn-thesis of ferrite.