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研究以共沉淀法制备TiO_2-SnO_2复合载体,浸渍负载活性组分CeO_2制成SCR脱硝催化剂。以NH3为还原剂,在适当的模拟烟气的实验条件下,考察了不同载体催化剂在150~400℃内对脱硝性能的影响。实验结果表明,经过改性的TiO_2-SnO_2复合载体改性对催化剂的脱硝性能有较大的影响,SnO_2的加入大大提高了Ce/TiO_2的脱硝效率,并可以在一定程度上抵抗SO2带来的毒害和钝化作用。此外,利用BET、XRD和SEM等表征手段,研究载体改性对催化剂微观结构的影响。表征结果显示,SnO_2的掺杂可在一定程度上促进载体及催化剂比表面积的增加,复合载体TiO_2-SnO_2对于活性组分CeO_2有着更好的分散性,活性组分CeO_2以高度分散的形式存在或呈无定型状态存在于复合载体TiO_2-SnO_2的表面,未出现团聚的现象。
The TiO 2-SnO 2 composite carrier was prepared by coprecipitation method, and the active component CeO 2 was impregnated to make SCR denitration catalyst. With NH3 as reductant, the effect of different supported catalysts on the performance of denitrification was studied under the suitable simulated flue gas conditions. The experimental results show that the modified TiO 2-SnO 2 composite support has a significant influence on the denitrification performance of the catalyst. The addition of SnO 2 greatly improves the denitration efficiency of Ce / TiO 2 and can resist the SO 2 -containing Poison and passivation. In addition, BET, XRD and SEM were used to study the influence of the carrier modification on the microstructure of the catalyst. The characterization results show that SnO_2 doping can promote the increase of specific surface area of the catalyst and catalyst to a certain extent. The composite carrier TiO_2-SnO_2 has better dispersibility for the active component CeO_2. The active component CeO_2 exists in highly dispersed form or No amorphous state exists in the composite carrier TiO_2-SnO_2 surface, did not appear the phenomenon of agglomeration.