V_2O_5/赤铁矿催化剂结构及其NH3选择性催化还原NO_x性能（英文）  

V_2O_5/hematite catalyst for low temperature selective catalytic reduction of NO_x with NH_3

作　　者：张萍[1] 陈天虎[1] 邹雪华[1] 朱承驻[1] 陈冬[1] 刘海波[1] 

机构地区：[1]合肥工业大学资源与环境工程学院纳米矿物与环境材料实验室,安徽合肥230009

出　　处：《催化学报》2014年第1期99-107,共9页

基　　金：supported by the Specialized Research Fund for the Doctoral Program of Higher Education(20110111110003);the National Natural Science Foundation of China(41130206)~~

摘　　要：以水热合成针铁矿为前驱体浸渍偏钒酸铵,分别于300,400和500°C空气中焙烧,制备了不同活性组分负载量的V2O5/赤铁矿(V/H)催化剂,用于氨选择性催化还原(SCR)脱硝.采用X射线衍射、透射电子显微镜、比表面积分析仪、程序升温还原及程序升温脱附等方法对催化剂结构进行了表征,并用标气配制模拟烟气进行了脱硝实验.结果表明,300°C煅烧3%V/H催化剂当烟气温度为250–300°C时NO转化率均可达95%以上;当配气中单独加入水蒸气或低浓度SO2(0.01%)时,V/H催化脱硝的活性不受影响;当系统加入高浓度的SO2(0.03%与0.05%)或同时添加H2O与SO2时,SCR脱硝效率下降,其机制可能是SO2在催化剂表面竞争吸附所致,停止添加后,催化活性迅速恢复.A series of V2O5/hematite （V/H） catalysts were prepared by impregnation of goethite with NH4VO3 solution and used in the selective catalytic reduction （SCR） of NO with NH3.The catalysts were characterized by X-ray diffraction,transmission electron microscopy,N2 adsorption,H2 temperature-programmed reduction,and NH3 temperature-programmed desorption.The effects of V2Os loading and calcination temperature on the SCR activity were investigated.The NO conversion over 3% V/H catalysts calcined at 300 ℃ exceeded 95% at 250-300 ℃.Neither H2O nor SO2 （0.01%） had any adverse impact on the activity,but a decrease of SCR activity was observed after high concentrations （0.03% and 0.05%） of SO2 were introduced.Cutting off the SO2 supply resulted in activity restoration.The simultaneous addition of 5% H2O and 0.03% SO2 led to a synergistic poisoning effect,but when these gases were switched off,the activity was recovered.SO2 adsorption on the catalyst surface led to the decrease in SCR activity.

关 键 词：铁氧化物 氧化钒 氮氧化物 选择性催化还原 

分 类 号：O643.32[理学—物理化学] X701[理学—化学]