Total oxidation of CO by CuMnOx catalyst at a low temperature

The copper manganese oxides catalyst was synthesized by using co-precipitation method with different Cu:Mn ratio for carbon monoxide oxidation. The drying of the precursor at 120C temperatures for 12 h in an oven and calcinations at 300C in stagnant air, flowing air and in a reactive gas mixture of 4.5% CO in the air known as reactive calcination (RC). The CuMnOx catalyst is prepared into different molar ratio like (Cu:Mn=2:1), (Cu:Mn=1:1) and (Cu:Mn=1:2) for oxidation of CO. The activity of the catalysts was evaluated in a tubular reactor under the following conditions: 100 mg catalyst, 2.5% CO in air, total flow rate 60 mL/min and temperature varying from ambient to a higher value, at which complete oxidation of CO was achieved. The decomposition of mixed copper and manganese nitrate in controlled conditions therefore produced CuMnOx catalyst and it depending on the oxygen concentration and flow conditions of gases during the heat treatment. The prepared catalysts were characterized by XRD, FTIR, SEM-EDX, XPS and BET techniques. The ability to oxidation state and phase composition of CuMnOx catalysts is a key preparation parameter for controlling the CO oxidation.

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