海绵铁负载锰脱硝催化剂的制备及性能研究

To address the issue of nitrogen oxides (NO_x) pollution control, a high-efficiency NH3-selective catalytic reduction (NH₃-SCR)denitration catalyst based on manganese supported on sponge iron (HMT) is developed. The HMT is modified with 2 mol/L nitric acid, impregnated with a manganese precursor (mass fraction of 15%), and calcined at 450 ℃ to obtain the denitration catalyst designated as HMT-2M-15Mn-450. The denitration activity, resistance to sulfur and water poisoning, and long-term stability of HMT-2M-15Mn-450 are investigated in a fixed-bed reactor. The interaction between manganese and HMT in the HMT-2M-15Mn-450 catalyst is characterized using techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The results demonstrate that at a space velocity of 50 000 m³/h, the NO conversion efficiency of HMT-2M-15Mn-450 exceeds 90% within the temperature range of 200—250 ℃. After 12 hours of continuous operation at 200 ℃, the NO conversion rate remains above 95%, and the catalyst exhibits strong resistance to sulfur and water poisoning. The findings provide a valuable reference for the high-value utilization of iron-based mineral materials in the field of flue gas denitration.