SiO_(2)对MnCe/Ti催化剂脱硝抗硫性能调控机理研究  

Mechanism of SiO_(2)Modulation on the Denitrification and Sulfur Resistance of MnCe/Ti Catalyst

作　　者：张林林 卿梦霞 刘亮[1] 陈亚鑫 赵斌 向军[2] ZHANG Linlin;QING Mengxia;LIU Liang;CHEN Yaxin;ZHAO Bin;XIANG Jun(School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[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

出　　处：《工程热物理学报》2024年第6期1845-1856,共12页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52106131);湖南省自然科学基金资助项目(No.2022JJ40489);长沙理工大学校级研究生实践创新项目(No.CLSJCX22099)。

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Mn Ce/Ti催化剂为研究对象,探究了SiO_(2)对Mn Ce/Ti催化剂宽温区脱硝抗硫性能的调控机理。研究表明,SiO_(2)提高了Mn Ce/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。SiO_(2)通过促进低温NH_4~+的生成、提高吸附态NO的反应活性、抑制SO_(2)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。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 SiO_(2)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 SiO_(2)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°C.SiO_(2)en-hanced the denitrification and sulfur resistance of the MnCe/Ti catalyst by promoting the generation of low-temperature NH,improving the reactivity of adsorbed NO,and inhibiting the adsorption of SO_(2)and the generation of bulk-like sulfate.

关 键 词：宽温催化剂 SiO_(2)掺杂 SO_(2)氧化 抗硫性 SCR机理 

分 类 号：X511[环境科学与工程—环境工程]