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采用挤出成型法制备出一系列MnOx/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。
A series of MnOx / TiO2 supported catalysts were prepared by extrusion molding. The SCR reaction was carried out under the conditions of 393 K and ammonia as reductant. The results showed that the denitration efficiency was the best when the content of MnOx was 20%. SEM observation found that the surface of the catalyst to form nanoscale “Morning Glory” objects, manganese oxide. After adding 6% Co and Ce oxide respectively, the denitration efficiency reached the highest. The XRD, XPS, SEM and BET characterization of 6% Ce-6% Co-20% MnOx / TiO2 showed that more Mn2O3 phase was converted to MnO2, the crystallinity of TiO2 decreased and the addition of CeOx increased the catalyst storage capacity , Chemisorbed oxygen concentration increased, catalytic activity increased. From the Co2p XPS map, it is found that the Co element exists as CoTiOx in the fresh catalyst and becomes CoOx after the SCR reaction.