In flue gas treatment in industries like thermal power and the chemical industry, reducing nitrogen oxide (NOx) emissions is crucial for meeting environmental standards. Traditional vanadium-titanium denitrification catalysts have significant shortcomings: a narrow temperature window (300-400°C), catalytic efficiency below 50% at low temperatures, and the biotoxicity of vanadium, leading to high disposal costs for spent catalysts. In recent years, iron-based honeycomb denitrification catalysts, with their advantages of wide temperature range, high efficiency, and environmental friendliness, have become a core focus of flue gas treatment technology upgrades. The new iron-based catalyst overcomes performance bottlenecks through a combination of "active component modification and carrier structure optimization." With Fe₂O₃ as the active core, it is doped with rare earth elements such as Ce and Mn to adjust the electronic structure, broadening the temperature window to 200-450°C. Even at 250°C, it achieves a NOx removal rate of 92%, making it suitable for low-load operation in thermal power plants and fluctuating flue gas temperatures in chemical cracking furnaces. The carrier utilizes a porous cordierite honeycomb structure, increasing the specific surface area to 120 m2/g, reducing flue gas resistance and reducing fan energy consumption by 15%. Significant results have been achieved in practical applications: After retrofitting a 2×660MW thermal power plant with an iron-based catalyst, NOx emissions remained stable below 30mg/m³, extending the operating life of vanadium-based catalysts by two years (from three to five years), and reducing annual catalyst replacement costs by 4 million yuan. In a cracking furnace flue gas treatment project at a coal chemical company, the catalyst tolerated high-sulfur conditions (SO₂ concentration of 800mg/m³), eliminating the need for additional desulfurization pretreatment and reducing overall treatment costs by 28%.

In the future, as the catalyst is optimized in conjunction with low-NOx combustion technology, iron-based denitrification catalysts will further adapt to the needs of treating even lower NOx concentrations, providing reliable technical support for the thermal power and chemical industry to achieve the dual goals of "environmental compliance and cost reduction and efficiency improvement."