采用挤出成型法制备出一系列MnO /TiO2负载型催化剂,在393 K和氨气为还原剂的条件下进行SCR反应,得出MnOx含量为20％时脱硝效率最佳.SEM观察发现催化剂表面形成纳米级“牵牛花”物体,为含锰的氧化物.分别添加6％的Co和Ce氧化物后,脱硝效率达到最高.对6％ Ce-6％ Co-20％ MnOx /TiO2进行XRD,XPS,SEM和BET表征,发现其有更多的Mn2O3相转化成MnO2,TiO2的结晶度降低,CeOx的加入提高了催化剂储存能力,化学吸附氧浓度增加,催化活性提高.从Co2p XPS图中发现新鲜催化剂中Co元素以CoTiOx形式存在,经过SCR反应后变为CoOx.
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