中文摘要：

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℃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℃煅烧3％V/H催化剂当烟气温度为250-300℃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.

英文摘要：

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.