Abstract
High denitration efficiency and strong adaptability to flue gas temperature fluctuations are the core properties of the NH(3)-SCR catalyst. In this study, Fe(2)O(3) modification is used as a means to explore the mechanism of adding Fe(2)O(3) to broaden the temperature range of the 6CeO(2)-40MnO(2)/TiO(2) catalyst during the preparation process. The results show that the 6Fe(2)O(3)-6CeO(2)-40MnO(2)/TiO(2) catalyst exhibits excellent denitration performance, with a denitration efficiency higher than 90%. The temperature range is from 129 to 390 °C. N(2) selectivity and resistance to SO(2) and H(2)O are good, and the denitration performance is significantly improved. When the Fe(2)O(3) content is 6%, it promotes lattice shrinkage of TiO(2), improves its dispersion, refines the grain size, and increases the specific surface area of the catalyst. At the same time, Fe(2)O(3) enhances the chemical adsorption of oxygen on the catalyst surface and increases the proportion of low-cost metal ions, thereby promoting electron transfer between active elements, generating more surface reactive oxygen species, increasing the oxygen vacancy content and adsorption sites for NO(x) and NH(3), and significantly improving the redox performance of the catalyst. This effect is particularly conducive to the formation of strong acid sites on the catalyst surface. The NH(3)-SCR reaction on the surface of the 6Fe(2)O(3)-6CeO(2)-40MnO(2)/TiO(2) catalyst follows both the L-H and E-R mechanisms, with the L-H mechanism being dominant.