化学工程2025，Vol.53Issue(10)：20-25,6.DOI:10.3969/j.issn.1005-9954.2025.10.004
不同锰前驱体制备OMS-2催化剂脱硝协同脱汞性能
Catalytic performance of simultaneous removal of NO and Hg over OMS-2 catalysts prepared with different manganese precursors
摘要
Abstract
To develop a low-temperature and highly efficient bifunctional catalyst is still a challenge for the simultaneous removal of NO and Hg in non-electric industries.Cryptomelane-type manganese oxide octahedral molecular sieve(KMn8O16,OMS-2)catalysts were synthesized via a hydrothermal method using Mn(NO3)2,MnSO4,MnCl2 or Mn(CH3COO)2 combined with KMnO4 at varying Mn2+/Mn7+molar ratios.The impacts of lower-valent manganese precursors on the low-temperature NH3-SCR denitration performance and simultaneous mercury removal were investigated.Physicochemical properties of the catalysts were characterized by SEM,XRD and XPS.The results indicate that higher proportions of higher-valent manganese precursors enhance both denitration and mercury removal efficiencies.All OMS-2 samples display fibrous nanorod-like morphologies,but their crystallinity and grain size vary significantly depending on the precursors.MN-OMS-2 catalyst[prepared with Mn(NO3)2]at n(Mn2+)∶n(Mn7+)of 1∶2 exhibits optimal performance,demonstrating the widest active temperature window(100-300 ℃).XPS analysis reveals that Mn4+dominates the average oxidation state of Mn in all OMS-2 catalysts.MN-OMS-2 shows the highest lattice oxygen content,with its highly active and mobile oxygen species effectively replenishing surface chemisorbed oxygen,thereby enhancing low-temperature SCR activity and mercury oxidation.The anion modulation strategy provides a viable pathway to tailor oxygen vacancies and surface oxygen species in catalysts,advancing the design of efficient bifunctional systems for simultaneous NOx and mercury abatement in non-electric industries.关键词
催化剂/选择性催化还原/锰前驱体/脱硝/脱汞Key words
catalyst/SCR/manganese precursor/denitrification/mercury removal分类
环境科学引用本文复制引用
刘松涛,王月圆,陈传敏,曹悦,贾文波..不同锰前驱体制备OMS-2催化剂脱硝协同脱汞性能[J].化学工程,2025,53(10):20-25,6.基金项目
国家自然科学基金青年项目(52300129) （52300129）
中央高校基本科研业务费专项资金资助项目(2024MS171) （2024MS171）
