Mn/Ce改性菱铁矿催化剂在SCR脱硝反应中的特性研究（英文）  

Performance of Mn-Ce co-doped siderite catalysts in the selective catalytic reduction of NOx by NH3

作　　者：魏钰靓 归柯庭 刘祥祥 梁辉 顾少宸 任冬冬 WEI Yu-liang;GUI Ke-ting;LIU Xiang-xiang;LIANG Hui;GU Shao-chen;REN Dong-dong(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,School of Energy and Environment,Southeast University,Nanjing,210096,China)

机构地区：[1]东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室

出　　处：《燃料化学学报》2019年第12期1495-1503,共9页Journal of Fuel Chemistry and Technology

基　　金：supported by the National Natural Science Foundation of China(51276039);Environmental Protection Research Project of Jiangsu Province(2015008)

摘　　要：富含过渡元素的菱铁矿是用于制备选择性催化还原(SCR)脱硝催化剂的理想材料。在本研究中,对菱铁矿掺杂了Mn和Ce,并研究了Mn-Ce共掺杂改性菱铁矿在NH3-SCR反应中去除NOx的活性。结果表明,经过450℃煅烧后菱铁矿的主要成分FeCO3能够转化为Fe2O3。菱铁矿掺杂Mn和Ce后能够提高比表面积和表面酸度,降低硫酸铵盐在催化剂表面上的热稳定性。因此,Mn-Ce共掺杂改性菱铁矿催化剂表现出较高的SCR脱硝活性和抗硫性。3%Mn1%Ce-菱铁矿催化剂在脱硝效率高于90%的温度窗口能够拓宽至180-300℃,同时在引入SO2 7.5 h后该催化剂的脱硝效率仍高于75%。Siderite, rich in the transition elements, is an idea material to prepare the catalysts for the selective catalytic reduction(SCR) of NOx by NH3. In this work, siderite was doped with Mn and Ce and the performance of Mn-Ce co-doped siderite catalysts in the removal of NOx(de-NOx) by SCR with NH3 was then investigated. The results illustrate that FeCO3 as the main component of siderite can be converted into Fe2O3 by calcination at 450 ℃. The doping of siderite with Mn and Ce can enhance the surface area and acidity of siderite and reduce the thermal stability of ammonium sulfate formed on the catalyst surface. As a result, the Mn-Ce co-doped siderite catalysts exhibit high efficiency in the de-NOx by SCR and high resistance against sulfur. Over the 3%Mn1%Ce-siderite catalyst, high NOx conversion(>90%) is achieved in the temperature window of 180-300 ℃;moreover, the NOx conversion remains above 75% even after introducing SO2 for 7.5 h.

关 键 词：Mn-Ce共掺杂 菱铁矿 选择性催化还原 脱硝 抗硫性 

分 类 号：X511[环境科学与工程—环境工程]