滴定方法对Fe_(0.7)Mn_(0.3)O_z催化剂低温SCR脱硝性能的影响  

Influence of Titration Methods on Low-Temperature SCR Performance of Fe_(0.7)Mn_(0.3)O_z Catalysts

作　　者：张信莉[1] 路春美[1,2] 王栋[1,2] 于贺伟 吴惊坤 

机构地区：[1]山东大学能源与动力工程学院,济南250061 [2]山东大学燃煤污染物减排国家工程实验室,济南250061

出　　处：《燃烧科学与技术》2015年第5期471-477,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51276101);高等学校博士学科点专项科研基金资助项目(20120131110022)

摘　　要：采用正、反滴定方法制备Mn改性γ-Fe2O3催化剂（Fe0.7Mn0.3Oz,0.3为Mn物质的量比）,考察了滴定方法对催化剂低温SCR脱硝活性的影响,并借助N2吸附-脱附、XRD、SEM及EDS等对催化剂进行表征.结果表明,与正向滴定法相比,反向滴定法能提高催化剂的低温SCR活性,优化其活性温度窗口;Fe0.7Mn0.3Oz-R催化剂在100,℃时的NOx转化率高达95.5%,,125~200,℃范围内NOx转化率可维持近100%,.较大的比表面积和比孔容、发达的孔隙结构、宽泛的孔径分布、铁锰间的强相互作用及较低结晶度的γ-Fe2O3是Fe0.7Mn0.3Oz-R催化剂具有较高低温SCR活性的主要原因.Mn doped 7-Fe2O3 catalysts （Fe0.7Mn0.3Oz, 0.3 represents the molar ratio of Mn）were prepared by using positive and reverse titration methods with ammonia as precipitant agent, and the effects of titration methods on the low-temperature selective catalytic reduction （SCR） activity of Fe0.7Mn0.3Oz catalysts were investigated. Catalysts were characterized by N2 adsorption-desorption, X-ray diffraction （XRD）, scanning electron microscope （SEM）and energy dispersive spectrometer （EDS）, respectively. The results show that compared with reverse titration method, positive titration method increases the low-temperature SCR activity and widens the activity temperature window of Fe0.7Mn0.3Oz catalysts. NOx conversion of Fe0.7Mn0.3Oz-R catalysts is up to 95.5% at 100 ℃, and reaches 100% at 125-200 ℃. Large surface area and pore volume, developed pore structure, broad pore size distribution, strong interaction between iron and manganese, and lowly-crystallized γ-Fe2O3 contribute to the high low-temperature SCR activity of Fe0.7Mn0.3Oz-R catalysts.

关 键 词：低温选择性催化还原 Fe0.7Mn0.3Oz催化剂 滴定方法 脱硝活性 

分 类 号：X511[环境科学与工程—环境工程]