通过共沉淀法制备了FeMnTiO_x催化剂,通过调变焙烧温度和Fe/Mn摩尔比调控催化剂的表面酸性和氧化还原能力,从而优化协同脱硝脱汞性能。利用X射线衍射、电子显微镜、N₂吸附/解吸、氢气程序升温还原、氨气程序升温脱附和X射线光电子能谱等手段分析催化剂的结构和催化反应机理。结果表明,焙烧温度为400℃、Fe/Mn摩尔比为0.5时,Fe_0.5MnTiO_x-400催化剂在150~330℃范围内的NO转化率大于90%;在200℃下的Hg⁰转化率高于90%,脱硝效率达到100%,表现出良好的协同脱硝脱汞性能。

FeMnTiO_x catalyst is prepared via co-precipitation method,and the surface acidity and redox capacity of the catalyst is regulated through varying the calcination temperature and the Fe/Mn molar ratio,therefore its performance in synergistic denitrification and mercury removal is optimized.The structure of FeMnTiO_x catalyst and the catalytic reaction mechanism are analyzed by using X-ray diffraction,electron microscopy,N₂ adsorption/desorption,hydrogen temperature-programmed reduction,ammonia temperature-programmed desorption and X-ray photoelectron spectroscopy.It is indicated that the conversion of NO by Fe_0.5MnTiO_x-400 catalyst exceeds 90% in the temperature range of 150-330℃ when the catalyst is prepared at a calcination temperature of 400℃ and a Fe/Mn molar ratio of 0.5.By using this catalyst,the conversion of Hg⁰ at 200℃ is higher than 90%,and the denitrification efficiency reaches 100%,showing good synergistic denitrification and mercury removal performance.

王斌宇(1996-),男,硕士生,研究方向为环境催化净化材料,wangbinyu1128@163.com;王兵(1989-),男,博士,助理研究员,研究方向为大气污染物化学及环境催化,通讯联系人,wangbing01@tyut.edu.cn。