引用本文:王 栋,张信莉,彭建升,路春美,韩奎华,徐丽婷,等.煅烧温度对γ-Fe2O3催化剂结构及其脱硝活性的影响[J].环境科学研究,2015,28(5):808-815.
WANG Dong,ZHANG Xinli,PENG Jiansheng,LU Chunmei,HAN Kuihua,XU Liting,et al.Effects of Calcination Temperature on Selective Catalytic Reduction of NOx over γ-Fe2O3 Catalysts Prepared with Microwave Assistance[J].Reserrch of Environmental Science,2015,28(5):808-815.]
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煅烧温度对γ-Fe2O3催化剂结构及其脱硝活性的影响
王 栋1,2, 张信莉1, 彭建升1, 路春美1,2, 韩奎华1,2, 徐丽婷1
1.山东大学能源与动力工程学院, 山东 济南 250061 ;2.山东大学, 燃煤污染物减排国家工程实验室, 山东 济南 250061
摘要:
采用沉淀-微波热解法,以FeSO4·7H2O为铁源制备环境友好的γ-Fe2O3催化剂,结合XRD(X射线衍射)、N2等温吸附-脱附、SEM(扫描电子显微镜)、EDS(能谱仪)等手段对催化剂样品的晶相、孔结构、表面形貌、表面元素组成等进行表征,并考察其NH3-SCR(选择性催化还原)脱硝性能,研究煅烧温度对γ-Fe2O3催化剂物性及NH3-SCR脱硝性能的影响规律. 结果表明:300、350和450 ℃下煅烧制备的催化剂中生成的杂质α-Fe2O3对SCR反应不利,而400 ℃煅烧制备的γ-Fe2O3催化剂脱硝性能最优,NOx转化率最高可达95%以上,XRD结果表明其纯度高,并且在60~100 nm孔径区间具有发达的孔隙结构,有利于SCR反应进行;随着煅烧温度升高,γ-Fe2O3催化剂表面晶格氧逐渐增加,颗粒形貌经历了片状颗粒(300、350 ℃)→球状颗粒(400 ℃)→针状颗粒(450 ℃)的变化过程,均匀的球状颗粒形貌及其表面丰富的晶格氧是400 ℃煅烧制得催化剂具备最优脱硝性能的重要因素.
关键词:  选择催化还原  脱硝  催化剂  γ-Fe2O3  煅烧温度  微波
DOI:
分类号:
基金项目:国家自然科学基金项目(51276101);山东省自然科学基金项目(ZR2012EEM013);高等学校博士学科点专项科研基金项目(20120131110022)
Effects of Calcination Temperature on Selective Catalytic Reduction of NOx over γ-Fe2O3 Catalysts Prepared with Microwave Assistance
WANG Dong1,2, ZHANG Xinli1, PENG Jiansheng1, LU Chunmei1,2, HAN Kuihua1,2, XU Liting1
1.School of Energy and Power Engineering, Shandong University, Jinan 250061, China ;2.National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction, Shandong University, Jinan 250061, China
Abstract:
Abstract: Environmentally-benign γ-Fe2O3 SCR catalysts, using FeSO4·7H2O as a ferrous source, were prepared under different calcination temperatures via the novel microwave pyrolysis. The catalytic activity for selective catalytic reduction (SCR) of NO by NH3(NH3-SCR) was tested on a fixed-bed denitration reactor. X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were employed to investigate the effects of calcination temperature on the characterization of the γ-Fe2O3 catalysts. The results indicated that γ-Fe2O3 catalysts calcined at 400 ℃ showed the best catalytic activity, with the highest NOx conversion above 95%. After being calcined at 300,0 and 450 ℃, α-Fe2O3 would emerge from γ-Fe2O3, which was unfavorable to the SCR reaction. The catalyst calcined at 400 ℃ with high purity exhibited abundant pore structures with the diameter of 60-100 nm. With the calcination temperature increased from 300 ℃ to 450 ℃, the lattice oxygen shifted to the surface of the catalyst and the surface morphology changed from lamellate (300 and 350 ℃), then to spherical (400 ℃), and eventually to acerose (450 ℃). Homogeneous spherical particles and the surface lattice oxygen were principally responsible for the high catalytic activity for the catalyst calcined at 400 ℃.
Key words:  SCR  DeNOx  catalyst  γ-Fe2O3  calcination temperature  microwave