摘 要
氮氧化物(NOx)作为工业废气中的主要污染物之一，其有效去除对环境保护至关重要。随着环保要求日益严格，传统高温处理技术面临能耗高、成本大等问题，低温催化还原技术成为研究热点。本文系统综述了近年来NOx低温催化还原领域的最新进展，重点探讨了不同催化剂体系的反应机理及性能优化。通过对多种过渡金属氧化物、分子筛以及复合材料的研究发现，铜基SSZ - 13分子筛在NH₃ - SCR反应中表现出优异的选择性和稳定性，可在150 - 250℃范围内实现高效脱硝。创新性地引入了原位红外光谱与理论计算相结合的方法，揭示了活性位点的本质特征及其演变规律。此外，针对实际工况条件下的抗硫中毒特性进行了深入分析，提出通过掺杂稀土元素改善催化剂耐久性的新思路。
关键词：氮氧化物低温催化还原 铜基SSZ-13分子筛 NH₃-SCR反应
Abstract
As one of the main pollutants in industrial waste gas, the effective removal of nitrogen oxide (NOx) is crucial to environmental protection. With the increasingly strict environmental protection requirements, the traditional high temperature treatment technology is faced with problems such as high energy consumption and large cost, and the low temperature catalytic reduction technology has become a research hotspot. This paper systematically reviews the recent progress in the field of NOx low-temperature catalytic reduction, focusing on the reaction mechanism and performance optimization of different catalyst systems. Through the study of a variety of transition me tal oxides, molecular sieves and composites, it is found that the copper-based SSZ-13 molecular sieve shows excellent selectivity and stability in the NH ₃ -SCR reaction, and can achieve efficient denitrification in the range of 150-250℃. The method of combining in-situ infrared spectroscopy with theoretical calculations is innovatively introduced to reveal the essential characteristics of the active site and its evolution law. In addition, the characteristics of sulfur toxicity under actual working conditions are deeply analyzed, and a new idea of improving catalyst durability by doping rare earth elements is proposed.
Keyword:Low-Temperature Catalytic Reduction Of Nitric Oxides Copper-Based Ssz-13 Zeolite Nh₃-Scr Reaction
目 录
1绪论 1
1.1工业废气中氮氧化物治理背景 1
1.2低温催化还原技术研究现状 1
1.3本文研究方法与思路 1
2低温催化还原反应机理 2
2.1氮氧化物生成途径分析 2
2.2催化剂活性位点探究 3
2.3反应动力学特征研究 3
3催化剂材料开发进展 4
3.1新型催化剂制备工艺 4
3.2催化剂稳定性提升策略 5
3.3催化剂成本效益分析 5
4工程应用及优化方案 6
4.1工业废气处理系统设计 6
4.2运行参数优化研究 6
4.3应用案例分析与展望 7
结论 7
参考文献 9
致谢 10
氮氧化物(NOx)作为工业废气中的主要污染物之一，其有效去除对环境保护至关重要。随着环保要求日益严格，传统高温处理技术面临能耗高、成本大等问题，低温催化还原技术成为研究热点。本文系统综述了近年来NOx低温催化还原领域的最新进展，重点探讨了不同催化剂体系的反应机理及性能优化。通过对多种过渡金属氧化物、分子筛以及复合材料的研究发现，铜基SSZ - 13分子筛在NH₃ - SCR反应中表现出优异的选择性和稳定性，可在150 - 250℃范围内实现高效脱硝。创新性地引入了原位红外光谱与理论计算相结合的方法，揭示了活性位点的本质特征及其演变规律。此外，针对实际工况条件下的抗硫中毒特性进行了深入分析，提出通过掺杂稀土元素改善催化剂耐久性的新思路。
关键词：氮氧化物低温催化还原 铜基SSZ-13分子筛 NH₃-SCR反应
Abstract
As one of the main pollutants in industrial waste gas, the effective removal of nitrogen oxide (NOx) is crucial to environmental protection. With the increasingly strict environmental protection requirements, the traditional high temperature treatment technology is faced with problems such as high energy consumption and large cost, and the low temperature catalytic reduction technology has become a research hotspot. This paper systematically reviews the recent progress in the field of NOx low-temperature catalytic reduction, focusing on the reaction mechanism and performance optimization of different catalyst systems. Through the study of a variety of transition me tal oxides, molecular sieves and composites, it is found that the copper-based SSZ-13 molecular sieve shows excellent selectivity and stability in the NH ₃ -SCR reaction, and can achieve efficient denitrification in the range of 150-250℃. The method of combining in-situ infrared spectroscopy with theoretical calculations is innovatively introduced to reveal the essential characteristics of the active site and its evolution law. In addition, the characteristics of sulfur toxicity under actual working conditions are deeply analyzed, and a new idea of improving catalyst durability by doping rare earth elements is proposed.
Keyword:Low-Temperature Catalytic Reduction Of Nitric Oxides Copper-Based Ssz-13 Zeolite Nh₃-Scr Reaction
目 录
1绪论 1
1.1工业废气中氮氧化物治理背景 1
1.2低温催化还原技术研究现状 1
1.3本文研究方法与思路 1
2低温催化还原反应机理 2
2.1氮氧化物生成途径分析 2
2.2催化剂活性位点探究 3
2.3反应动力学特征研究 3
3催化剂材料开发进展 4
3.1新型催化剂制备工艺 4
3.2催化剂稳定性提升策略 5
3.3催化剂成本效益分析 5
4工程应用及优化方案 6
4.1工业废气处理系统设计 6
4.2运行参数优化研究 6
4.3应用案例分析与展望 7
结论 7
参考文献 9
致谢 10
