Industrial side-stream test of low temperature NH_3-SCR catalyst for De-NOx

An industrial side-stream test with a low temperature NH3-SCR catalyst prepared by impregnation method was carried out at a nitric acid plant for 1 000 h.The results showed that the catalyst possessed high activity and stability,NOx conversion was more than 95% and NOx concentration of the outlet was less than 100 × 10-6 under the operation condition as follows: pressure 0.2 MPa,flue gas inlet temperature 230 ℃,space velocity 5 000 h-1.The structure of the fresh and used catalyst was characterized by N2 adsorption,SEM and XRD.The results indicated that there was no obvious change of the physical properties of the catalyst before and after the experiment.