摘要
采用不同沉淀工艺制备磁性γ-Fe2O3催化剂,在固定床上对其NH3-SCR性能进行研究,借助XRD和N2吸附分析揭示了其物性.结果表明,采用正向滴定法、NH4OH作为沉淀剂制得的y-Fe2O3催化剂纯度高,结晶度适宜,孔径主要分布于2 ～ 5nm,有利于脱硝;实验工况下,325 ～400℃温度区间内,其脱硝效率保持90％以上.沉淀剂种类及其加入方法直接影响催化剂的脱硝性能,不当的沉淀工艺会导致α-Fe2O3生成、晶粒直径过大、孔结构塌陷等问题,不利于脱硝.
Magnetic γ-Fe2O3 catalysts were prepared utilizing different precipitation technology and tested for their selective catalytic reduction （SCR）of NOx with NH3 on a fixed-bed reactor. Physical properties of the magnetic γ- Fe2O3 catalysts were characterized by N2 adsorption-desorption and X-ray diffraction （XRD）. The results indicate that catalyst achieve NOx conversion of 90% at 325-400℃ by using NH4OH （ammonia） as precipitant, through coprecipitation for its high purity and appropriate crystalline degree. SCR performance of the catalysts was directly influenced by types of precipitants and directions of titration. Improper precipitation technology would lead to the formation of α-Fe2O3, the oversized crystal particles and the collapse of pore structure, consequently decresing the de-NOx efficiency of catalysts.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2014年第3期245-251,共7页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(51276101)
山东省自然科学基金资助项目(ZR2012EEM013)
高等学校博士学科点专项科研基金资助项目(20120131110022)
关键词
沉淀工艺
磁性γ-Fe2O3催化剂
选择性催化还原
脱硝性能
precipitation technology
magnetic γ-Fe2O3 catalysts
selective catalytic reduction（SCR）
de-NOx efficiency
