摘要
为考察Fe添加量对锰基催化剂低温选择性催化还原(SCR)烟气中NO的性能,采用湿式浸渍法制备以γ-Al_2O_3为载体,以MnOx、FeOx为活性组分的系列催化剂,通过X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)分析等手段对其进行表征。结果表明:Fe的引入对提高催化剂的SCR活性具有明显的促进作用。Fe添加量为0.04 mmol/g时制备的Mn(0.8)-Fe(0.04)/γ-Al_2O_3催化剂脱硝效率在150℃条件下即可以达到93.1%。Fe添加量为0.04mmol/g时催化剂中形成的球状结晶β-MnO_2分散最为均匀,最有利于催化反应的进行。比表面积不是影响催化剂SCR活性的决定性因素。Mn(0.8)-Fe(0.04)/γ-Al_2O_3催化剂孔径分布以2～50nm的中孔为主,活性组分也主要负载到较大的中孔中,有利于催化反应的进行。Fe的加入可以提高催化剂的抗硫性能。
In order to investigate the influence of Fe-doped amount on the low temperature selective catalytic reduction(SCR)performance of Mn-based catalysts,a series of catalysts withγ-Al 2O 3 as the support and MnO x,FeO x as the active component were prepared by wet impregnation method.XRD,SEM,XPS and other test methods were used to characterize the properties of the catalysts.It was found that the SCR activity of Mn/γ-Al 2O 3 catalysts was obviously improved after Fe-doped.The results showed that 93.1%NO conversion was obtained by Mn(0.8)-Fe(0.04)/γ-Al 2O 3 catalyst at 150℃.When the Fe-doped amount was 0.04 mmol/g,the dispersion of sphericalβ-MnO 2 crystal was most evenly and conducive to the catalytic reaction.The specific surface area was not a decisive factor affecting the SCR activity of the catalysts.The pore size distribution of Mn(0.8)-Fe(0.04)/γ-Al 2O 3 catalyst was dominated by mesopores of 2-50 nm,and the active component was also mainly loaded into the larger mesopores,which was favorable for the catalytic reaction.Moreover,the addition of Fe could improve the sulfur resistance of the catalyst.
作者
安泽文
王金玉
李厚洋
姜华伟
王翠苹
AN Zewen;WANG Jinyu;LI Houyang;JIANG Huawei;WANG Cuiping(College of Mechanical andElectrical Engineering,Qingdao University,Qingdao Shandong 266071;Qingdao Energy ThermoelectricityCo.,Ltd.,Qingdao Shandong 266011)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2019年第2期185-190,共6页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.51676102)
山东省自然科学基金资助项目(No.ZR2015EM004)
省部共建煤炭清洁利用与生态化工国家重点实验室开放课题(No.2016-07)
关键词
Fe添加量
脱硝效率
晶型
微观形貌
抗硫性能
Fe-doped amount
denitration efficiency
crystal type
microscopic morphology
sulfur resistance
