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实验以TiO2为载体采用浸渍法制备CuOx/TiO2、CeOx/TiO2、CuCeOx/TiO2和MnCuCeOx/TiO2催化剂,考察这些催化剂氧化NO活性,探究Cu、Ce摩尔比和添加Mn元素对CuCeOx/TiO2催化剂氧化NO活性的影响,使用扫描电镜观察催化剂表面结构。研究发现,Cu、Ce元素配合后的CuCeOx/TiO2催化剂氧化活性明显好于单独含Cu、Ce的催化剂,当Cu、Ce摩尔比为Cu:Ce=1∶2时,CuCeOx/TiO2催化剂氧化活性最好,在NO浓度500×10-6,O210%,空速为24 000 h-1,350℃时,NO氧化度为0.62;添加Mn元素可以提高CuCeOx/TiO2催化剂低温氧化活性,250℃时,MnCuCe/Ti-3和MnCuCe/Ti-5催化剂氧化度为0.53和0.69,300℃时,MnCuCe/Ti-3和MnCuCe/Ti-5催化剂氧化度均为0.76;此外,实验还研究了NO在MnCuCe/Ti-3催化剂上反应的动力学方程。
In the experiment, CuOx / TiO2, CeOx / TiO2, CuCeOx / TiO2 and MnCuCeOx / TiO2 catalysts were prepared by impregnation method with TiO2 as support. The oxidation activity of NO, the molar ratio of Cu and Ce and the addition of Mn on the oxidation of NO The influence of the activity, the use of scanning electron microscopy catalyst surface structure. It was found that the CuCeOx / TiO2 catalysts exhibited significantly better oxidation activity than Cu and Ce catalysts alone. When the molar ratio of Cu to Ce is 1: 2, the oxidation activity of CuCeOx / TiO2 catalyst is the highest The oxidation degree of NO was 0.62 for NO concentration of 500 × 10-6, O210% and space velocity of 24000 h-1,350 ℃. The addition of Mn could improve the low-temperature oxidation activity of CuCeOx / TiO2 catalyst. At 250 ℃, the oxidation rate of MnCuCe / The oxidation degrees of MnCuCe / Ti-3 and MnCuCe / Ti-5 catalysts were both 0.76 for the oxidation degree of Ti-3 and MnCuCe / Ti-5 catalysts of 0.53 and 0.69,300 ℃. In addition, the oxidation degree of NO in MnCuCe / Ti -3 catalyst reaction kinetics equation.