中低温NH_(3)-SCR催化剂抗中毒研究进展

Research Progress on Anti-poisoning of NH_(3)-SCR Catalysts at Medium and Low Temperature

目前,中低温氨选择性催化氮氧化物还原(NH_(3)-SCR)技术瓶颈在于确保催化剂高活性、高选择性前提下兼有抗硫耐水和抗碱土金属中毒等能力。该文综述了近年来适于中低温环境下SCR催化剂的研究进展,包括催化活性提高和抗中毒能力改进,阐述了影响中低温SCR反应的4大影响因素:表面酸性、活性位点、形貌结构、氧化还原性。并提出从源头设计出发,利用对影响催化剂性能的4大因素,设计出高效的目标催化剂。

At present, the technical bottleneck of the ammonia selective catalytic reduction of nitrogen oxides(NH_(3)-SCR) at medium and low temperature is to ensure that the catalyst has the ability to resist sulfur, water and alkaline earth metal poisoning under the premise of high catalyst activity and high selectivity. In this paper, the recent research progress of SCR catalysts at medium and low temperature were summarized, including the improvement of catalytic activity and anti-poisoning ability.The four major influencing factors that affect the SCR reaction at medium and low temperature were described including: surface acidity, active site, morphology structure, and redox property. In the end, the method of designing an efficient target catalyst based on the source was proposed, using four major factors that affect the performance of the catalyst.