Preparation and optimization of Mn-based catalysts for low-temperature NH3-SCR: Component selection, synthesis strategy and influencing factors

• Published in: Separation and purification technology 2025-05, Vol.357, p.130103, Article 130103
• Main Authors: Niu, Zirong, Gao, Fengyu, Wu, Wenjing, Yi, Honghong, Zhao, Shunzheng, Duan, Erhong, Wang, Chengzhi, Tang, Xiaolong
• Format: Article
• Language: English
• Subjects: Active components; Carriers; Influencing factors; Mn-base; NH3-SCR; Synthesis methods
• ISSN: 1383-5866
• DOI: 10.1016/j.seppur.2024.130103

[Display omitted] •Ni, Ce and Co doping boosts Mn catalysts’ NH3-SCR activity and H2O&SO2 resistance.•TiO2, CNTs and g-C3N4 as carriers can enhance Mn-based catalyst’s SO2 resistance.•Synthesis methods influence microstructure and component interactions of catalysts.•The design of precursor solution is crucial for Mn-based catalyst performance.•Active components, carriers, synthesis methods and impact factors are reviewed. Mn-based catalysts have attracted more and more attention in the past decade due to their excellent low-temperature NH3-selective catalytic reduction activity (150–225 °C). However, it also has weak H2O&SO2 resistance, which has become the focus of research in recent years. Advancements in techniques such as element doping, carrier selection and preparation optimization can improve the surface acidity and redox capacity of these catalysts, thereby enhancing their H2O&SO2 resistance. This paper reviews the active components, carriers, synthesis methods and the factors affecting the catalytic performance (activity and stability) of low-temperature selective catalytic reduction denitrification catalysts. The optimization methods for active components and metal doping are discussed and the current research status of carriers (such as TiO2, Al2O3, CeO2, activated carbon and carbon nanotubes) are reviewed. Additionally, common synthesis methods are summarized, including mechanical mixing, impregnation, deposition–precipitation, sol–gel and hydrothermal synthesis. The paper focuses on how the factors (such as precursor type, ratio of elements doping, pH of precursor solution, loading of active components and calcination conditions) impact the denitrification activity and stability of catalysts. Finally, the progress and shortcomings in current research on NH3-SCR catalysts are summarized, and future research should focus on developing active protective components with sulfur release capacities, enhancing resistance to multiple poisoning factors under complex conditions and achieving multi-pollutant synergistic treatment.