Catalytic activity of Co, Cu and Mn oxide catalysts synthesized by the sol-gel combustion method in the low-temperature oxidation of carbon oxide

Abstract

The synthesis of catalysts based on cobalt, copper and manganese oxides by sol-gel method with combustion was carried out, and their catalytic activity was studied in the reaction of low-temperature oxidation of carbon monoxide to dioxide. Oxides of cobalt, copper and manganese, as well as their double oxides (Co–Mn, Cu–Mn and Co–Cu) were synthesized. X-ray phase analysis showed the formation of manganites and oxides of corresponding metals in the Co–Mn and Cu–Mn systems. It was revealed that in the Co–Cu system only oxides of separate metals are formed. It was found that cobaltmanganese and copper-manganese oxide systems synthesized by sol-gel combustion method exhibit high catalytic activity in the low-temperature (110–140 0C) conversion of carbon monoxide into dioxide. One-step synthesis of Cu–Mn/Al2O3 catalytic system was also carried out by sol-gel method with burning precursors with binder hydrogel (Al2O3), and its high activity in low-temperature conversion of carbon monoxide was revealed. The catalytic systems were investigated by X-ray diffraction, IR spectral methods, BET, SEM. The results obtained show the possibility of obtaining active multicomponent oxide catalysts in low-temperature oxidation of carbon monoxide by technologically simple sol-gel combustion method.