Effect of Bimetal Element Doping on the Low-Temperature Activity of Manganese-Based Catalysts for NH-SCR.

A series of novel MnZrCo denitrification catalysts were prepared by the co-precipitation method. The effect of co-modification of MnO catalyst by zirconium and cobalt on the performance of NH-SCR was studied by doping transition metal cobalt into the MnZr catalyst. The ternary oxide catalyst MnZrCo can reach about 90% of NO conversion in a reaction temperature range of 100-275°C, and the best NO conversion can reach up to 99%. In addition, the sulfur resistance and water resistance of the MnZrCo catalyst were also tested. When the concentration of SO is 200ppm, the NO conversion of catalyst MnZrCo is still above 90%. 5 Vol% HO has little effect on catalyst NO conversion. The results showed that the MnZrCo catalyst has excellent resistance to sulfur and water. Meanwhile, the catalyst was systematically characterized. The results showed that the addition of zirconium and cobalt changes the surface morphology of the catalyst. The specific surface area, pore size, and volume of the catalyst were increased, and the reduction temperature of the catalyst was decreased. In conclusion, the doping of zirconium and cobalt successfully improves the NH-SCR activity of the catalyst.