Abstract:

Mn-Ce/TiO₂ catalyst was prepared by impregnating Mn-Ce on TiO₂ and was characterized by XRD，BET and PL. The influences of Ce-doping concentration，loading，calcinations temperature，space velocity，inlet concentration of NO and volume fraction of oxygen on the performance of catalytic oxidation were examined. The results showed that the effect of doping Ce not only increased the surface area of MnO_x/TiO₂ but also enhanced the dispersion of active phase over TiO₂. At Ce-doping concentration of [Ce]/[Mn]=1/3，10% loading Mn-Ce/TiO₂ catalyst calcined at 300 ℃ for 3 h had high catalytic oxidation activity. When inlet concentration of NO was 300 μL/L，O₂ 10%，space velocity was 41000 h^－1，oxidation rate of NO over Mn-Ce/TiO₂ reached 58% at 200 ℃.

摘要：

采用溶胶凝胶法制备TiO₂载体，在负载Mn(Ac)₂制备Mn/TiO₂催化剂时掺杂铈，制备了Mn-Ce/TiO₂催化剂。考察了Ce的掺杂量、活性组分负载量及焙烧温度等制备条件和空速、NO进口浓度及O₂含量等工艺条件对其催化氧化NO性能的影响。对催化剂进行了XRD、BET及PL表征。结果表明，Ce的添加有利于活性组分在载体表面的分散，增强了活性组分与载体之间的相互作用，增大了催化剂的比表面积及催化剂对氧的吸附能力。当Ce掺杂量为 [Ce]/[Mn]=1/3、负载量为10%、焙烧温度为300 ℃条件下制备的Mn-Ce/TiO₂催化剂，在反应温度200 ℃、空速41000 h^－1、NO含量为300 μL/L及O₂含量为10%的条件下，NO氧化率可达58%，满足NO_x最高吸收率的要求。