Zhang Jiadong, Ma Zengyi, Cao Ang, Yan Jianhua, Wang Yuelan, Yu Miao, Hu Linlin, Pan Shaojing
State Key Laboratory of Clean Energy Utilization, Zhejiang University Hangzhou 310027 China
Institute for Carbon Neutrality, Ningbo Innovation Center, Zhejiang University Ningbo 315100 China.
RSC Adv. 2024 Oct 17;14(44):32583-32601. doi: 10.1039/d4ra05140h. eCollection 2024 Oct 9.
Selective catalytic reduction (SCR) is a efficiently nitrogen oxides removal technology from stationary source flue gases. Catalysts are key component in the technology, but currently face problems including poor low-temperature activity, narrow temperature windows, low selectivity, and susceptibility to water passivation and sulphur dioxide poisoning. To develop high-efficiency low-temperature denitrification activity catalyst, manganese-based catalysts have become a focal point of research globally for low-temperature SCR denitrification catalysts. This article investigates the denitrification efficiency of unsupported manganese-based catalysts, exploring the influence of oxidation valence, preparation method, crystallinity, crystal form, and morphology structure. It examines the catalytic performance of binary and multicomponent unsupported manganese-based catalysts, focusing on the use of transition metals and rare earth metals to modify manganese oxide. Furthermore, the synergistic effect of supported manganese-based catalysts is studied, considering metal oxides, molecular sieves, carbon materials, and other materials (composite carriers and inorganic non-metallic minerals) as supports. The reaction mechanism of low-temperature denitrification by manganese-based catalysts and the mechanism of sulphur dioxide/water poisoning are analysed in detail, and the development of practical and efficient manganese-based catalysts is considered.
选择性催化还原（SCR）是一种从固定源烟气中高效去除氮氧化物的技术。催化剂是该技术的关键组成部分，但目前面临低温活性差、温度窗口窄、选择性低以及易受水钝化和二氧化硫中毒等问题。为开发高效低温脱硝活性催化剂，锰基催化剂已成为全球低温SCR脱硝催化剂的研究热点。本文研究了无载体锰基催化剂的脱硝效率，探讨了氧化价态、制备方法、结晶度、晶型和形态结构的影响。考察了二元和多组分无载体锰基催化剂的催化性能，重点研究了过渡金属和稀土金属对锰氧化物的改性作用。此外，研究了负载型锰基催化剂的协同效应，将金属氧化物、分子筛、碳材料等其他材料（复合载体和无机非金属矿物）作为载体。详细分析了锰基催化剂低温脱硝的反应机理以及二氧化硫/水中毒的机理，并考虑了实用高效锰基催化剂的开发。
