Study on the catalytic mechanism and water resistance of Cu-Mn-Snx catalyst for CO elimination

Abstract CO in coal mine underground spaces can easily cause casualties among miners. The humidity in coal mines is relatively high, and traditional CuMn catalysts are prone to deactivation. Compared to traditional CuMn catalysts, doping with Sn enhances the activity and water resistance of CuMn catalysts. The CuMnSn catalyst was tested using XPS, FTIR, and a self-made Activity Test Experimental System, with partial data processed using the Avantage software. The results show that Sn increases the number of active sites (Cu+) on the CuMn catalyst and the proportion of surface adsorbed oxygen (Oads) and surface lattice oxygen (Olat) in O 1s, which is the reason for the improved activity of the CuMnSn catalyst. Sn weakens the coordination bond between Cu2+ and H2O, reducing the formation of CO32−, which is the reason for the improved water resistance of the catalyst.