钾对氧化铜催化活性炭还原NO反应的助催化作用

Promoting Role of Potassium on the Catalytic Performance of Copper Oxide for the Reduction of NO by Activated Carbon

研究了活性炭负载的Cu-K-O复合氧化物催化剂上碳还原NO的反应.结果表明,K的加入可有效地提高CuO催化剂的活性和稳定性,当Cu/K的质量比为2时催化性能最佳.X射线衍射、X射线光电子能谱和程序升温脱附-质谱等结果表明,K与Cu间的协同作用可促进表面碳活化中心与表面氧物种生成CO2的反应,保持表面Cu2+活性中心的数量,从而有利于Cu2+/Cu+反应循环的进行.

The reduction of NO by activated carbon over a Cu-K-O mixed oxide catalyst was investigated.We found that the addition of K to CuO obviously improved its catalytic performance and stability,and the optimum Cu/K weight ratio is 2.Characterization by X-ray photoelectron spectroscopy,X-ray diffraction,and temperature-programmed desorption shows that the presence of K can promote the reaction between the surface carbon active sites and the surface oxygen species to form CO2 by a synergetic effect between Cu and K.Additionally,a higher surface concentration of Cu 2＋ is retained,which favors the Cu^2＋ /Cu^＋ reduction cycle on the active sites.