Review of deNOx catalysts with SO2 and H2O poisoning resistance for low-temperature NH3-SCR

Abstract

Abstract: Low-temperature NH3-SCR is an efficient technology to transform NOx into N2. It has favorable economic value and broad application prospect. While low-temperature NH3-SCR catalysts suffer deactivation when SO2 and H2O exist in reactant gases. This drawback restricts practical application of the low-temperature NH3-SCR technology. In this paper，the mechanism of SO2 and H2O poisoning on NH3-SCR catalysts has been expounded. The review focuses on the low-temperature NH3-SCR catalysts that contain active components of V，Mn，Ce，Fe and noble metals. The relationships between the doping components，supporter properties，preparation methods and SCR reaction mechanism，etc and SO2 and H2O poisoning resistance analyzed. Based on the problems existing in the current study，the emphasis of future research is proposed，including intensive study on the sulfate species formed with catalyst poisoning and suggestion on the corresponding controlling measure.

Key words: low-temperature deNOx, SCR, catalysts, poisoning resistance

摘要： 低温NH3-SCR技术能在较低温度下实现NOx高效转化为N2，具有较好的经济效益，应用前景广阔。若反应气体中含有H2O和SO2时，会导致低温NH3-SCR催化剂中毒失活，限制了低温NH3-SCR技术的应用。本文对低温NH3-SCR催化剂H2O和SO2中毒机理进行了阐述，重点关注以V、Mn、Ce、Fe 4种过渡金属和以贵金属为活性组分的低温NH3-SCR催化剂的研究进展，分析了元素掺杂、载体性质、制备方法和反应机理等方面与催化剂抗SO2和H2O中毒性能的关系。针对当前存在的问题，指出了今后的研究重点是深入分析催化剂中毒时硫酸盐类的生成过程，并提出相应的控制对策。

关键词: 低温脱硝, 选择催化还原, 催化剂, 抗毒性能

YANG Chao1，CHENG Hua1，HUANG Bichun1，2. Review of deNOx catalysts with SO2 and H2O poisoning resistance for low-temperature NH3-SCR[J]. Chemical Industry and Engineering Progree.

杨超1，程华1，黄碧纯1，2. 抗SO2和H2O中毒的低温NH3-SCR脱硝催化剂研究进展[J]. 化工进展.

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Review of deNOx catalysts with SO2 and H2O poisoning resistance for low-temperature NH3-SCR

抗SO2和H2O中毒的低温NH3-SCR脱硝催化剂研究进展

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