Jiangsu Key Laboratory of Vehicle Emissions Control, School of Chemistry and Chemical Engineering,Nanjing University
School of Environment, Nanjing University
Jiangsu Ningtian Environmental Technology Co., Ltd.
Center of ModernAnalysis, Nanjing University
Jiangsu Province Engineering Research Center ofEnvironmental Risk Prevention and Emergency Response Technology, School of Environment,Nanjing Normal University

氮氧化物(NOx)的深度减排是我国大气环保领域的一项紧迫任务,以氨为还原剂的选择性催化还原(SCR)是工业烟气NOx治理的主流技术。随着脱硝重心由燃煤电厂向钢铁、水泥等非电行业转移,脱硝催化剂的工作温度也出现低温化发展的转变趋势,特别是经湿法或半干法脱硫处理后,烟温多低于150℃。在此背景下,如何实现脱硝催化剂的长效稳定运行是SCR技术应用面临的一项严峻挑战。温度降低不仅会加剧水、硫中毒失活,还容易产生新的硝铵盐沉积问题。从温度降低带来的脱硝催化剂性能变化出发,在对不同干扰物种(H2O、SO2、NH4NO3)诱导催化剂失活及其特征作简要介绍的基础上,重点从脱硝催化剂结构调变、组合净化工艺选择以及反应气氛调控等角度,对现有抗水/硫/硝铵中毒策略进行归纳总结,并探讨其抗中毒机理。最后,结合实际应用需求,对超低温脱硝催化剂抗中毒研究的未来发展方向进行了展望。

The strict control of nitrogen oxides (NO) is an urgent task for improving China′s air quali⁃ty, and selective catalytic reduction (SCR) with ammonia represents the dominant method for treatmentof NO exhaust from industries. As the focus of SCR denitrification shifts from thermal power plants tonon-electric industries such as steel and cement kilns, the overall working temperature of SCR showsan obvious shift to lower temperatures. Specifically, the flue gas temperature for denitrification isusually below 150 ℃ when a desulfurization treatment is pre -installed. Under these circumstances,achieving long-term and stable operation of denitrification catalysts becomes a pivotal challenge for theapplication of SCR technology. A decrease in reaction temperature can exacerbate not only water andsulfur poisoning but also induce new deactivation problems due to ammonium nitrate deposition. There⁃fore, this comprehensive review presents the research progress on the poisoning resistance of SCR cata⁃lysts under ultra-low temperatures. The paper starts with introducing the changes in denitrification per⁃formance caused by temperature reduction. After briefly describing catalyst deactivation and its charac⁃teristics, the main focus is on the developed poisoning resistance strategies against water/ sulfur/ ammo⁃nium nitrate. These strategies are discussed from the perspectives of denitrification catalyst structuremodulation, combined purification process selection, and regulation of the reaction atmosphere. Fur⁃thermore, we introduce the research progress on anti-poisoning strategies and provide a discussion ofanti-poisoning mechanism. Finally, considering the practical application requirements, a prospect forthe future development direction of poisoning resistance studies in ultra-low temperature denitrificationis presented.

江苏省杰出青年基金资助项目(BK20230007);国家自然科学基金青年科学基金资助项目(22202100);国家自然科学基金面上资助项目(22276097)

安冬琦,程倩妮,宋旺,等.超低温脱硝催化剂的抗水/硫/硝铵中毒研究进展[J].能源环境保护,2024,38(4):123-135.

AN Dongqi, CHENG Qianni, SONG Wang, et al. Research advances in anti-water/ sulfur/ ammonium nitrate poi⁃soning of ultra-low temperature denitrification catalysts[J]. Energy Environmental Protection, 2024, 38(4): 123-135.