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通过共沉淀法将SiO_2组分掺入到V2O5-WO3/SiO_2-TiO_2催化剂TiO_2载体中,并通过多种物理化学手段,考察了不同SiO_2掺杂量对催化剂结构、表面性质与SCR性能的影响.结果表明,SiO_2掺入到TiO_2中,Si与Ti形成Si—O—Ti键,使催化剂比表面积增加.Si—O—Ti键的生成以及Si Ox物种上的-OH基团使催化剂表面Br?nsted酸增加,但新增的Br?nsted酸对SCR反应不利,并且SiO_2的掺杂也使得V~(5+)含量降低,Si—O—V键合作用使分散的VOx物种更难还原.Si组分以共沉淀法掺入到V_2O_5-WO_3/TiO_2催化剂会造成脱硝活性的显著下降.
The SiO 2 component was doped into the TiO 2 support of V 2 O 5 -WO 3 / SiO 2 -TiO 2 by coprecipitation, and the effects of different SiO 2 doping amount on the structure, surface properties and SCR properties of the catalyst were investigated by various physicochemical methods. The results showed that Si 2 O 3 -TiO 2 -SiO 2 -TiO 2 bond was formed between Si and Ti by adding Si 2 O 2 to TiO 2, However, the addition of Br? nsted acid is unfavorable for the SCR reaction, and the doping of SiO 2 also decreases the content of V 5+, and the Si-O-V bonding makes it more difficult to reduce the dispersed VOx species. The Si component co-precipitation method into the V_2O_5-WO_3 / TiO_2 catalyst will result in a significant decline in denitrification activity.