金属组分负载量对复合催化剂湿式氧化性能的影响

Effect of Metal Component Loading on Properties of Composite Catalysts in Wet Oxidation

采用浸渍法制备Cu-Fe-Pt-La/γ-Al_2O_3催化剂,通过催化湿式氧化法处理垃圾渗滤液,以COD去除率、浊度去除率和反应后垃圾液中金属溶出量为指标,评估催化剂金属组分负载量对其活性和稳定性的影响,并对催化剂结构进行表征。结果表明,催化剂的活性和金属溶出量均随着负载量的增大而增加,0.7 mol/L为适宜的金属组分负载量,此催化剂属于介孔结构,表面颗粒分布均匀,且在循环应用中活性稳定。

The Cu-Fe-Pt-La / γ-Al_2O_3 catalysts were prepared by the impregnation method, and the influence of metal component loading on the catalyst activity and stability were evaluated by the COD removal rate,turbidity removal rate and metal leaching for the catalytic wet oxidation of landfill leachate,meanwhile the structures of the catalysts were characterized. The results show that,with increasing the loading,the activity and the leached metal concentration of the catalyst increases,and 0. 7 mol / L is chosen as the optimum metal component loading. For the Cu-Fe-Pt-La / γ-Al_2O_3 catalyst of 0. 7 mol / L loading,whose components uniform distributed on the surface, exhibites mesoporous structure and excellent stability in circular applications.