Research progress of SCR medium temperature denitrification catalyst for cement industry

Selective catalytic reduction (SCR) technology has been widely used in the denitrification of cement industry, in which a relatively mature system has been formed in the high temperature (280–350 ℃) section, but there is still a breakthrough in the middle temperature zone. Focusing on medium temperature catalysts, this paper reviewed the progress of Mn, Ce and V catalysts, and analyzed the doping of Sm, Nb, Ho, Sb, La, Mo and Pr to improve the performance of catalysts. Combined with the characteristics of the high content of SO₂, H₂O and alkali metal in cement kiln smoke, the causes of catalyst poisoning were analyzed, and the way to resist sulfur poisoning, water poisoning, and alkali metal poisoning was summarized. The research prospect of SCR medium temperature denitration catalyst in cement industry is prospected.