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通过共沉淀法将La组分掺入到TiO_2载体中,采用浸渍法将V和W组分负载到La_2O_3-TiO_2复合氧化物上,制备出V2O5-WO3/La_2O_3-TiO_2催化剂。考察不同La_2O_3掺杂量对其NH3催化还原NO性能的影响,同时通过多种物理化学手段进行表征分析。XRD,NH_3-in situ DRIFTS,H_2-TPR,XPS和UV-vis DRS测试结果表明,元素La与Ti以La-O-Ti键相互作用,生成高度分散的镧物种,也使得TiO_2具有更好的热稳定性,但由于LaO_x物种与VO_x物种和WO_x物种之间的相互作用,降低了催化剂的氧化还原性和表面Brnsted酸数量,从而降低了其催化活性。
The La component was doped into the TiO 2 support by coprecipitation method, and the V and W components were supported on La 2 O 3 -TiO 2 composite oxide by impregnation method to prepare V 2 O 5 -WO 3 / La 2 O 3 -TiO 2 catalyst. The effect of different La 2 O 3 doping on the catalytic performance of NH 3 in the catalytic reduction of NO was investigated. Meanwhile, the physical and chemical properties of La 2 O 3 were characterized and characterized. The results of XRD, NH 3 -in situ DRIFTS, H 2 -TPR, XPS and UV-vis DRS show that La and Ti interact with La-O-Ti bonds to form highly dispersed lanthanum species and make TiO 2 have a better However, due to the interaction between LaO_x species and VO_x species and WO_x species, the redox activity of the catalyst and the amount of Brnsted acid on the surface of the catalyst are reduced, thus reducing the catalytic activity.