关键词: 低温SCR, 载体, Mn-Ce催化剂, 脱硝活性

Abstract: Using three different kinds of titanium dioxide compositions as carriers, Mn-Ce/TiO2, Mn-Ce/TiO2-SiO2, Mn-Ce/TiO2-WO3 catalysts were prepared by impregnation and characterized by XRD, BET and SEM techniques. The effects of SiO2 and WO3 on denitration activity and sulfur resistance of the catalyst were investigated. The results showed that the addition of SiO2 and WO3 increased the specific surface area of the supports and the number of the surface active acidic sites of the catalyst, and the denitration efficiency and the sulfur resistance of the catalyst were improved. At the conditions of the space velocity of 10000h-1 and 100℃, the NO removal rate on Mn-Ce/TiO2 catalysts was only about 30%, and the NO removal rate on Mn-Ce/TiO2-SiO2 and Mn-Ce/TiO2-WO3 catalyst was 45% and 50%, respectively. Within 270 min reaction, the NO removal rate on Mn-Ce/TiO2 catalysts were reduced from 80% to 40% at 150℃ in presence of 150 μL/L SO2, and Mn-Ce/TiO2-SiO2 and Mn-Ce/TiO2-WO3 catalyst decreased from 84% to 55% and 70%,respectively.

Key words: low temperature SCR, carrier, Mn-Ce catalyst, Denitration efficiency