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首页> 中文期刊> 《化工学报》 >铜锰复合氧化物催化剂上甲苯的催化燃烧

铜锰复合氧化物催化剂上甲苯的催化燃烧

         
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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 copper manganese mixed oxide catalysts Cu1−xMnx (x = 0—1.0) with high surface area were synthesized by using carbonate co-precipitation method and their performance in catalytic combustion reaction of toluene was investigated by varying the mole ratio of Cu and Mn. XRD, H2-TPR, XPS and N2 adsorption/desorption were used to characterize the structure and textural properties of catalysts. The resulting Cu1−xMnx catalyst showed higher catalytic activity than mono-metal oxide catalyst, especially when a small amount of copper was doped into manganese oxide. With increasing the manganese content from 0 to 1.0, a volcanic tendency for catalytic activity was observed. Results of catalyst characterization revealed that the promoted catalytic activity can be associated with some interrelated factors, such as depressed crystallinity, highly dispersed oxide species onto the other, easier catalyst reducibility, more surface oxygen and enhanced surface area. It was difficult to attribute the promoted catalytic activity only to a single and specific factor. A synergistic effect between manganese and copper species was considered to be the most intrinsic reason.

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