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采用碳酸盐共沉淀法在全范围内制备了一系列具有高比表面积的铜锰互相掺杂的复合氧化物,通过调变铜锰摩尔比考察了其在甲苯催化燃烧反应中的表现。铜锰复合氧化物催化剂,尤其是掺杂低浓度铜的氧化锰,在甲苯催化燃烧中表现出了超越单组分氧化物的性能。随掺杂量的变化,反应活性呈现火山状的趋势。XRD、H2-TPR、XPS及BET等表征结果显示氧化物粒子的结晶度及分散度、催化剂的可还原性、表面氧浓度、催化剂的比表面积等诸多因素均对催化活性产生了一定的影响,然而复合氧化物催化性能上升的根本原因在于铜物种和锰物种之间存在的较强的相互协同作用。
A series of complex oxides doped with copper and manganese with high specific surface area were prepared by carbonate coprecipitation in the whole range. Their catalytic performance in toluene catalytic combustion was investigated by adjusting the mole ratio of copper and manganese. Copper-manganese composite oxide catalysts, especially manganese oxide doped with low concentrations of copper, have shown performance over single-component oxides in toluene catalytic combustion. With the change of doping amount, the reactivity appears volcano-like. The characterization results of XRD, H2-TPR, XPS and BET showed that the catalytic activity was influenced by many factors such as the crystallinity and dispersity of oxide particles, the reducibility of catalyst, the surface oxygen concentration and the specific surface area of catalyst. However, the basic reason for the increase of the catalytic activity of the composite oxides lies in the strong mutual synergism between the copper species and the manganese species.