选择性催化还原脱硝催化材料研究进展

Nitrogen oxides (NO_x) are the long-term focus of air pollution control, the technological core of industrial mainstream selective catalytic reduction of NO_x with ammonia is deNO_x catalyst, and the research and development of environmentally friendly and highly efficient deNO_x catalysts is a common requirement of the world's environmental protection. The background of deNO_x demand, the application status of deNO_x catalysts and existing problems are briefly described, and the research progress of three types of deNO_x catalysts, including noble metals, metal oxides and ion-exchanged zeolites are summarized. The development progress of the environmentally friendly rare earth-based deNO_x catalysts and the research progress on non-toxic SCR catalysts for marine deNO_x are highlighted. The rare earth-based deNO_x catalyst independently developed by China is the second flue gas deNO_x catalyst for large-scale industrial application, which has been designated as a substitute for the vanadium-based catalyst by the three state ministries and the national development and reform commission, and will become a key material for industrial deNO_x applications in the future. From the two aspects of ultra-low NO_x emission demand driven by different industries and the difficulty of deNO_x in severe working conditions, the new challenges of deNO_x catalysts are discussed. The ultra-low temperature deNO_x catalysts with strong anti-water and sulfur dioxide poisoning abilities, the high temperature deNO_x catalysts with high hydrothermal stability, and the new multi-functionalization of deNO_x catalysts for treating other pollutants, are the focuses of future development.