制备方法对Mn-Ce/TiO2催化剂低温选择性催化还原活性的影响

采用溶胶凝胶法、浸渍法以及两者相结合的方法制备了Mn-Ce/TiO2催化剂。运用XRD、BET和SEM等技术对催化剂进行了表征,发现溶胶凝胶法制备的Mn-Ce/TiO2催化剂为锐钛矿结构,具有较大的比表面积,中孔结构丰富,Mn、Ce活性组分在载体表面高度分散或形成了无定形结构。实验研究了催化剂对氨选择性催化还原NO反应的催化性能,结果表明,用溶胶凝胶法制备的Mn-Ce/TiO2催化剂脱硝活性最好,当Mn、Ce负载量为20%,NH3/NO摩尔比为1.1,空速为9 436 h-1,烟气温度为240℃时,NO转化率大于90%。

Effects of preparation methods of Mn-Ce/TiO2 catalyst on low temperature SCR activity

Mn-Ce/TiO2 catalysts were prepared by sol gel method, impregnation method and the combination of the two. The catalysts were characterized by XRD, BET and SEM techniques, results showed that Mn-Ce/TiO2 catalyst prepared by sol gel method presented the anatase structure with the more specific surface area, active component (Mn, Ce) distributed on the surface of the supporter in amorphous form. The research on the catalytic performance of ammonia selective catalytic reduction of NO showed that the catalyst prepared by sol gel method had the best activity of denitration. When the capacity of Mn, Ce was 20%, the NO conversion rate of the catalyst was more than 90% at NH3/NO=1.1, space velocity of 9 436 h -1 and temperature of 240℃.