SiO2对MnCe/Ti催化剂脱硝抗硫性能调控机理研究
Mechanism of SiO2 Modulation on the Denitrification and Sulfur Resistance of MnCe/Ti Catalyst
张林林 1卿梦霞 1刘亮 1陈亚鑫 1赵斌 1向军2
作者信息
- 1. 长沙理工大学能源与动力工程学院,长沙 410114
- 2. 华中科技大学煤燃烧国家重点实验室,武汉 430074
- 折叠
摘要
燃煤电厂深度调峰对脱硝催化剂的宽温区脱硝抗硫性能提出更高要求,而现有的V-W/Ti系催化剂普遍存在低温脱硝抗硫性能差等问题.本文以MnCe/Ti催化剂为研究对象,探究了 SiO2对MnCe/Ti催化剂宽温区脱硝抗硫性能的调控机理.研究表明,SiO2提高了 MnCe/Ti催化剂的高温脱硝活性,在250～350℃温区内,脱硝效率可稳定控制在90％以上.SiO2通过促进低温NH+的生成、提高吸附态NO的反应活性、抑制SO2在催化剂表面的吸附与块状硫酸盐的生成,来增强催化剂的脱硝性能与抗硫性能.
Abstract
The deep peaking of coal-fired power plants puts higher requirements on the wide-temperature denitrification and sulfur resistance of SCR catalysts,while the existing V-W/Ti cat-alyst generally have poor low-temperature denitrification and sulfur resistance.In this paper,the modulation mechanism of SiO2 on the wide-temperature denitrification and sulfur resistance of the MnCe/Ti catalyst was investigated by targeting the MnCe/Ti catalyst.The study revealed that SiO2 improved the high-temperature denitrification activity of the MnCe/Ti catalyst,and the NO conversion could be stably controlled above 90％in the temperature zone of 250～350℃.SiO2 en-hanced the denitrification and sulfur resistance of the MnCe/Ti catalyst by promoting the generation of low-temperature NH4,improving the reactivity of adsorbed NO,and inhibiting the adsorption of SO2 and the generation of bulk-like sulfate.
关键词
宽温催化剂/SiO2掺杂/SO2氧化/抗硫性/SCR机理Key words
wide-temperature catalyst/SiO2 doping/SO2 oxidation/sulfur resistance/SCR mecha-nism引用本文复制引用
基金项目
国家自然科学基金(52106131)
湖南省自然科学基金(2022JJ40489)
长沙理工大学校级研究生实践创新项目(CLSJCX22099)
出版年
2024
NETL
NSTL
万方数据