摘要
NO_(x)和CO作为需重点处理的污染物,随钢铁烧结等烟气排放标准进一步提高,传统的NH3-SCR(NH3选择性催化还原NO_(x))脱硝技术存在明显不足,特别是烧结烟气排放温度低于钒基催化剂窗口温度,导致脱硝催化剂活性不足及生成的硫铵盐堵塞催化剂表面,对CO控制尚缺乏有效手段。因此开发低温催化剂成为脱除低温烟气中NO_(x)及CO的关键因素。对Mn基催化剂在脱除NO_(x)和CO方面进展进行论述,对比活性组分、制备方法、载体等方面对锰基低温催化剂催化活性的影响,详细介绍Cu、Ce等金属对于锰基催化剂改性的影响,分析了元素掺杂与催化性能的关系;在此基础上,对近年来CO还原NO技术的最新研究成果进行系统梳理和总结,着重探讨反应机理、O_(2)在反应中的作用机制,结果表明,Mn元素丰富的核外电子排布是其在脱除NO_(x)和CO中活性优异的根本原因,但目前研究成果多数仅处于实验室开发阶段,在实际烟气中缺乏大规模验证。最后,展望了Mn基催化剂未来的发展方向,并提出催化剂失活机制以及提高催化剂抗中毒方案。
NO_(x) and CO are the key pollutants to be treated.With the further improvement of flue gas emission standards such as steel sintering,the traditional NH 3-SCR(NH 3 selective catalytic reduction of NO_(x))denitration technology has significant shortcomings,especially the sintering flue gas emission temperature is lower than the window temperature of vanadium based catalysts,causing that the activity of vanadium based denitration catalyst is insufficient and the generated ammonium sulfide blocks the catalyst surface,but there is still a lack of effective means for CO control.Therefore,the development of low-temperature catalyst has become the key factor for removing NO_(x) and CO from low-temperature flue gas.The progress of Mn based catalyst in removing NO_(x) and CO was discussed,the effects of active components,preparation methods and supports on the catalytic activity of Mn based low-temperature catalyst were compared,and the effects of Cu、Ce and other metals on the modification of Mn based catalyst were introduced in detail,and the relationship between element doping and catalytic performance was analyzed.On this basis,the latest research results of no reduction technology by CO in recent years were systematically combed and summarized,and the reaction mechanism and the action mechanism of O_(2) in the reaction were emphatically discussed.The results show that the rich extranuclear electron arrangement of Mn element is the fundamental reason for its excellent activity in removing NO_(x) and CO,but most of the current research results are only in the laboratory theoretical stage and lack of large-scale verification in the actual flue gas.Finally,the future development direction of Mn based catalyst was prospected,and the catalyst deactivation mechanism and the scheme to improve the anti poisoning of catalyst were put forward.
作者
玄承博
张兴宇
王鲁元
赵田田
韩世旺
陈正鑫
刘倩倩
王学涛
XUAN Chengbo;ZHANG Xingyu;WANG Luyuan;ZHAO Tiantian;HAN Shiwang;CHEN Zhengxin;LIU Qianqian;WANG Xuetao(School of Energy and Power Engineering,Qilu University of Technology,Jinan 250014,China;Energy Research Institute of Shandong Academy of Sciences,Shandong Academy of Sciences,Jinan 250353,China;Transportation Engineering School,Henan University of Science Technology,Luoyang 471003,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2023年第3期122-132,共11页
Clean Coal Technology
基金
国家自然科学基金资助项目(201900130)
山东省自然科学基金资助项目(ZR2021QE066
ZR2019BEE053)。
关键词
锰基催化剂
低温SCR
CO氧化
CO-NO
manganese catalyst
low temperature SCR
carbon monoxide oxidation
CO-NO
