NH3SO3改性稀土尾矿催化剂NH3-SCR脱硝活性及SO2/H2O耐受性能研究
Research on NH3-SCR Denitration Activity and SO2/H2O Tolerance of NH3SO3-Modified Rare Earth Tailings Catalyst
焦坤灵 1焦晓云 2刘佳杰 2汪思瀛 2李娜 2武文斐1
作者信息
- 1. 内蒙古科技大学能源与环境学院,内蒙古包头 014010;内蒙古自治区高效洁净燃烧重点实验室,内蒙古包头 014010
- 2. 内蒙古科技大学能源与环境学院,内蒙古包头 014010
- 折叠
摘要
采用球磨、微波焙烧方法制备了不同质量分数NH3SO3改性稀土尾矿NH3-SCR脱硝催化剂.通过BET、SEM-EDS、XRD、NH3-TPD、H2-TPR分析了催化剂脱硝活性及SO2/H2O耐受性能.结果表明:NH3SO3改性使催化剂脱硝活性得到了显著提高,l0％NH3SO3改性催化剂在300～350 ℃脱硝活性可达90％左右.SO2/H2O共同作用可将10％NH3SO3改性催化剂脱硝活性提高至97％,其促进作用保持了良好的稳定性,且具有可逆性.NH3SO3改性稀土尾矿后,催化剂比表面积、酸性位点及强度增加,表面活性物质分散度更高,弱化了尾矿矿物晶型,提高了催化剂吸附能力和氧化还原能力,从而提高催化脱硝活性,同时具备优良的SO2/H2O耐受性.
Abstract
Different mass fractions of NH3SO3-modified rare earth tailings NH3-SCR denitration catalysts were prepared using ball milling and microwave roasting methods.The denitration activity and SO2/H2O tolerance of the catalysts were analyzed by BET,SEM-EDS,XRD,NH3-TPD and H2-TPR.The results show that NH3SO3 modification significantly improves the denitration activity of the catalysts,and the de-nitration activity of the 10％NH3SO3-modified catalyst could reach about 90％at 300～350 ℃.The com-bined action of SO2/H2O can further improve the denitration activity of the 10％NH3SO3-modified cata-lyst to 97％,and its promoting effect remains stable and reversible.After the rare earth tailings are modi-fied by NH3SO3,the specific surface area,acidic sites,and strength of the catalysts increace.The dispersion of surface active substances of the tailings is improved,and the crystalline structure is weakened.The ad-sorption capacity and redox ability of the catalysts are improved,thereby enhancing catalytic denitration ac-tivity and maintaining excellent SO2/H2O tolerance.
关键词
NH3SO3改性/稀土尾矿/催化剂/NH3-SCR脱硝/SO2/H2O耐受性能/脱硝活性Key words
NH3SO3 modification/rare earth tailings/catalyst/NH3-SCR denitration/SO2/H2O tolerance/denitration activity引用本文复制引用
基金项目
国家自然科学基金(51866013)
内蒙古自治区自然科学基金重大项目(2019ZD13)
出版年
2024
NETL
NSTL
万方数据