CO3O4/MPS催化氧化NO性能

微乳法制备的介孔二氧化硅（MPS）负载Co3O4构成了Co3O4/MPS催化剂，考察了负载量、焙烧温度等制备条件和反应温度、空速、NO进口浓度、O2体积分数等操作条件对Co3O4/MPS催化氧化NO性能的影响，并对载体及催化剂进行了BET和XRD表征。结果表明：MPS比表面积远大于其它载体，Co3O4呈立方晶型，MPS负载25%的Co3O4在300 ℃下焙烧3 h得到催化剂的晶体颗粒最小，分散性好，具有最佳催化氧化活性和良好的稳定性，在NO进口浓度500 μL/L、O2体积分数10%、空速12 000 h－1的条件下，250 ℃时NO氧化率可达50%～60%（此时可获得最高的NOx吸收效率），300 ℃氧化率达到80%以上，接近热力学平衡值。

Catalytic oxidation of NO over CO3O4/MPS

The Co3O4/MPS catalyst was prepared by impregnating Co3O4 on MPS and characterized by XRD and BET. MPS was prepared by the micro emulsion method. The influences of Co3O4 loading, calcination temperature, space velocity, reaction temperature, inlet concentration of NO and volume fraction of oxygen on the performance of catalytic oxidation were examined. The results showed that the surface area of MPS was the largest in three catalyst carriers and Co3O4 was cubic crystal. 25%Co3O4/MPS catalyst calcined at 300℃ for 3h had the smallest crystal particles, the best surface dispersion and optimal catalytic oxidation activity. When the inlet concentration of NO was 500 μL/L, O2 10%, space velocity 12000 h-1, the oxidation rate of NO over Co3O4/MPS reached 50%—60% at 250℃, and the highest absorption efficiency was achieved. At 300℃, the oxidation rate was above 80%, almost equal to the thermodynamic equilibrium value.