The oxidation of carbon monoxide was studied on oxide Cu–Mn–Fe catalytic systems with metal ratio Cu:Mn:Fe=1:1:1; 2:1:1; 1:2:1 and 1:1:2 obtained by the sol-gel method with combustion. The results of X-ray phase analysis showed that the catalytic systems have a complex phase composition. Along with double oxides of manganese and iron, ferrites of copper-, manganese, copper manganite, manganese-substituted copper ferrites were formed (CuFe₂O₄; Mn_0.43Fe_2.57O₄, Mn_0.98Fe_2.02O₄; CuMn₂O₄; Cu_1.2Mn_1.8O₄;  Cu_0.5Mn_0.5Fe₂O₄). It has been found that depending on the ratio of metals in the catalyst, the reaction start temperature is in the temperature range of 120–170⁰C. And after 3–5 minutes after the start of the reaction, the conversion begins to increase sharply, reaching 100% within the next 5 minutes

doi.org/10.32737/0005-2531-2022-2-93-99