%0 Journal Article %T Effect of Mn on the Performance and Mechanism of Catalysts for the Synthesis of (Ce,La)CO<sub>3</sub>F %A Zedong Cheng %A Na Li Li %A Liming Hou %A Kunling Jiao %A Wenfei Wu %J Journal of Power and Energy Engineering %P 1-32 %@ 2327-5901 %D 2021 %I Scientific Research Publishing %R 10.4236/jpee.2021.911001 %X In accordance with the cerium-lanthanum ratio of fluorocerium ores in the mineralogy of the Baiyun Ebo process, the (Ce,La)CO₃F grains were synthesised by hydrothermal method using pure material to simulate bastnaesite minerals, and used as NH₃-SCR denitrification catalysts. The activity results showed that the synthetic (Ce,La)CO₃F was roasted at 500&#730C, and the NOx conversion was 27% at 200&#730C. The NH₃-SCR catalytic activity of the synthesised (Ce,La)CO₃F was improved by loaded transition metal Mn. The best catalyst was found to be produced by impregnating (Ce,La)CO₃F with 1 mol/L manganese nitrate solution, with a NOx conversion of 80% at 250&#730C. The loading of Mn resulted in the appearance of numerous well-dispersed MnOx species on the catalyst surface, the dispersion of Ce₇O₁₂ species was also greatly enhanced, and the reduction in grain size indicated that Mnⁿ⁺ entered into the (Ce,La)CO₃F lattice causing lattice shrinkage. The number of acidic sites on the catalyst surface and the redox capacity were enhanced. The amount of Ce³⁺ in the catalyst was also enhanced by the introduction of Mnⁿ⁺, but the proportion of adsorbed oxygen decreased, which indicated that the introduction of Mnⁿ⁺ was detrimental to the increase in the proportion of adsorbed oxygen. The reaction mechanisms of the (Ce,La)CO₃F and Mn/(Ce,La)CO₃F catalysts were investigated by in-situ Fourier transform infrared spectroscopy (FTIR). The results showed that catalysts followed the E-R and L-H mechanisms. When loaded with Mn, the main reactive species in the L-H mechanism were the