Iron-doped Mn-Ce/TiO_2 catalyst for low temperature selective catalytic reduction of NO with NH_3

作     者：Boxiong Shen ,Ting Liu,Ning Zhao,Xiaoyan Yang,Lidan Deng College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China. 

作者机构：College of Environmental Science and Engineering Nankai University Tianjin 300071 Chin 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2010年第22卷第9期

页      面：1447-1454页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China (No. 90610018,50976050) the New Century Excellent Talents in University (No. NCET-07-0457) the National Key Technologies R&D Program of Tianjin (No. 09ZCKFSH01900) 

主　　题：low-temperature SCR Fe-Mn-Ce/TiO2 H2O SO2 

摘      要：The catalysts of iron-doped Mn-Ce/TiO2 （Fe-Mn-Ce/TiO2） prepared by sol-gel method were investigated for low temperature selective catalytic reduction （SCR） of NO with NH3. It was found that the NO conversion over Fe-Mn-Ce/TiO2 was obviously improved after iron doping compared with that over Mn-Ce/TiO2. Fe-Mn-Ce/TiO2 with the molar ratio of Fe/Ti = 0.1 exhibited the highest activity. The results showed that 96.8% NO conversion was obtained over Fe（0.1）-Mn-Ce/TiO2 at 180~C at a space velocity of 50,000 hr-1. Fe-Mn-Ce/TiO2 exhibited much higher resistance to H2O and SO2 than that of Mn-Ce/TiO2. The properties of the catalysts were characterized using X-ray diffraction （XRD）, N2 adsorption, temperature programmed desorption （NH3-TPD and NOx-TPD）, and X- ray photoelectron spectroscopy （XPS） techniques. BET, NH3-TPD and NOx-TPD results showed that the specific surface area and NH3 and NOx adsorption capacity of the catalysts increased with iron doping. It was known from XPS analysis that iron valence state on the surface of the catalysts were in Fe^3＋ state. The doping of iron enhanced the dispersion and oxidation state of Mn and Ce on the surface of the catalysts. The oxygen concentrations on the surface of the catalysts were found to increase after iron doping. Fe-Mn-Ce/TiO2 represented a promising catalyst for low temperature SCR of NO with NH3 in the presence of H20 and SO2.