Sm助剂调控Cu/ZSM-5分子筛的NH3-SCR脱硝性能OA

To address issues of easy aggregation of Cu species,unreasonable distribution of acidic sites,and insufficient water and sulfur resistance of Cu/ZSM-5 catalysts NH3-SCR denitrification,Sm-modified Cu/ZSM-5 catalysts were prepared by impregnation.The effects of Sm as a promoter on the structural properties and NH3-SCR denitrification performance of the catalysts were investigated,and the catalysts were characterized using XRD,FTIR,N2 adsorption-desorption,UV-Vis DRS,NH3-TPD,NO-TPD,and H2-TPR.The results show that the introduction of Cu and Sm does not destroy the MFI framework structure of the H-ZSM-5 zeolite,and the metal species are well dispersed on the support surface.The addition of Sm can adjust the distribution of catalyst acidity,improve the dispersion of Cu species and redox properties,and enhance the adsorption performance and activation ability of NH3 and NO.When the mass fraction of Sm and Cu is 2%and 3%,the catalyst exhibits excellent denitrification performance in the range of 200-400℃.maintaining NO conversion above 95%.It also shows high activity under conditions of 10%(φ)H2O and 100 μmol/mol SO2 and demonstrates good stability during 120 h of continuous operation at 250℃.This indicates that the Sm promoter can effectively enhance the NH3-SCR denitrification ability and poison resistance stability of the Cu/ZSM-5 catalyst.This study provides a reference for the design and development of efficient denitrification catalysts.