Mn掺杂对磁性γ-Fe_2O_3低温SCR脱硝活性的影响  

Influence of Mn Doping on Magnetic γ-Fe_2O_3 Catalysts for Selective Catalytic Reduction at Low Temperatures

作　　者：张信莉[1] 王栋[1] 陈莲芳[1] 路春美[1] 熊志波[1] 

机构地区：[1]山东大学能源与动力工程学院,山东济南250061

出　　处：《工程热物理学报》2014年第5期995-998,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51276101);教育部博士点基金(No.20120131110022);山东省自然科学基金(No.ZR2012EEM013)

摘　　要：采用共沉淀法制备一系列Fe_1-xMn_xO_z（x为Mn物质的量比,x=0、0.1、0.3、0.5）磁性催化剂,考察Mn掺杂对γ-Fe₂O₃催化剂低温SCR脱硝活性的影响规律。结果表明,Mn掺杂能显著提高γ-Fe₂O₃的低温SCR脱硝活性,并拓宽其活性温度窗口;Fe_0.7Mn_0.3O_z催化剂的低温SCR脱硝活性最高,在125²00℃其NO_x转化率约为100%。N₂吸附及XRD分析结果表明,Mn的掺杂能优化γ-Fe₂O₃催化剂的孔隙结构及孔径分布,增大其比表面积和比孔容,并与催化剂中铁氧化物相互作用形成良好固溶体,从而提高γ-Fe₂O₃催化剂的低温SCR活性。A series of magnetic catalysts Fe_(1-x)Mn_xO_z(x represents the molar ratio of Mn,x=0,0.1,0.3,0.5),were synthesized via a co-precipitation method,and the effects of Mn doping on γ-Fe_2O_3catalyst for selective catalytic reduction(SCR) at low temperatures were investigated.It showed that the doping of Mn significantly increased the low-temperature SCR activity and widened the activity temperature window of γ-Fe_2O_3 catalyst.Fe_(0.7)Mn_(0.3)O_z catalyst exhibited the best low-temperature SCR activity,and high NO_x conversion which was about 100%was obtained at the temperature range of 125?200?.N_2 adsorption and X-ray diffraction(XRD) analysis indicated that the addition of Mn optimized the pore structure as well as the pore size distribution of γ-Fe_2O_3 catalyst,and increased its BET surface area and pore volume.In addition,Mn could interact with iron oxide to form solid solution.Therefore,the doping of Mn enhanced the low-temperature SCR activity of γ-Fe_2O_3catalyst.

关 键 词：MN掺杂 磁性γ-Fe₂O₃催化剂 NO_x转化率 低温SCR脱硝活性 

分 类 号：X773[环境科学与工程—环境工程]