碳化硅负载氧化铜催化剂低温NH3选择性催化还原NOx的性能

Silicon carbon-supported copper oxide catalysts for the selective catalytic reduction of NOx with NH3 at low temperature

采用湿浸渍法制备了碳化硅负载的氧化铜(CuO/SiC)催化剂,采用扫描电镜(SEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等对其进行了表征,在模拟烟气条件下研究了该催化剂对低温NH3选择性催化还原NOx的性能。结果表明,CuO/SiC还原NO的催化活性与氧化铜含量和反应温度有关。负载质量分数为5%的CuO/SiC催化剂在低温下表现出较高的活性,虽然SO2对其催化活性略有抑制;研究发现,NO还原反应发生在被吸附的氨与气相的NO或弱吸附的NO之间。所制备的CuO/SiC催化剂为实际的工业应用提供了新的选择。

Silicon carbide supported copper oxide(CuO/SiC)catalysts were prepared by wet impregnation method and characterized by scanning electron microscope(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS);their catalytic performance in the selective catalytic reduction of NOx with NH3 at low temperature was investigated with a mimic flue gas.The results indicate that the catalytic performance of CuO/SiC in the selective catalytic reduction NO with NH3 is related to the loading of copper oxide and reaction temperature.The CuO/SiC catalyst with a CuO loading of 5%exhibits high activity at low temperature,where SO2 shows slightly inhibition upon the NO reduction activity;the NO reduction reaction over CuO/SiC may take place between the adsorbed ammonia and the gaseous or weakly adsorbed NO.Such CuO/SiC catalysts may provide a new choice for the practical removal of NOx in industry.