MnFeAl/H-ZSM-5催化剂的制备及其脱硝协同脱除二噁英性能OA

In order to improve the catalytic activity and sulfur resistance of MnFe/Z(MnFe/H-ZSM-5)catalyst in the synergistic removal of dioxins at medium and low temperatures,an modification strategy of acid etching coupled with Al modification was proposed,and MnxFe1Al1/Z(MnxFe1Al1/H-ZSM-5-E)bifunctional catalyst was successfully prepared.The denitrification efficiency,chlorobenzene removal efficiency and synergistic removal effect of both were systematically evaluated at 100-400 ℃,and characterized by SEM,BET,XRD,XPS,H2-TPR and NH3-TPD.The results show that the MnxFe1Al1/Z catalyst has the best synergistic removal performance for NO and CB(chlorcbenzene),and the removal efficiency of both reaches more than 90％at 280-400 ℃.After acid etching and Al doping modification,the specific surface area and pore size of MnFe/Z catalyst increase,Mn and Fe are highly dispersed on H-ZSM-5.Further analysis results show that acid etching coupled with Al modification can effectively increase the oxygen vacancy content of MnFe/Z,produce abundant acidic sites and promote the improvement of redox ability.At the same temperature,the synergistic removal efficiency of NO and CB is effectively improved,and Al modification also significantly improves the sulfur resistance of the catalyst.