| 摘要:将采用自蔓延高温燃烧合成法(SHS)制备的一系列MnCePrO2-δ复合氧化物催化剂以及贵金属Pt催化剂涂覆于空白的DPF载体上，对其同时去除柴油机尾气中碳烟颗粒物和氮氧化物反应的催化活性进行研究。结果表明: MnCePrO2-δ系列催化剂在氧化碳烟颗粒物和NO的性能上相较于贵金属Pt有明显的优势。其中，Mn0.3Ce0.5Pr0.2具有最好的催化活性，催化去除碳烟颗粒的起燃温度为296 ℃，最大氧化碳烟颗粒速率温度为418 ℃，NO的转化率达到65.6%。利用程序升温反应技术研究了气体流量和加载碳烟质量的变化对Mn0.3Ce0.5Pr0.2催化剂催化活性的影响。研究表明:当气体流量由500(mL· min-1)减小至100(mL· min-1)时，碳烟颗粒的起燃温度和最大氧化速率温度分别降低了10 ℃和20 ℃，而加载的碳烟质量的改变对碳烟颗粒的起燃温度和最大氧化速率温度没有影响。 |
| 关键词: 自蔓延燃烧合成法 催化剂 碳烟颗粒 程序升温反应 |
|
| Study on Oxidation Activity of MnCePrO2-δ Composite Oxides on Diesel Soot in the Presence of O2 and NOx |
| Huang Yong,Wang Kexin,Guan Bin,Ni Hong,Lin He |
| Shanghai Jiaotong University, Shanghai 200240;Chinese Research Academy of Environmental Sciences, Beijing 100012 |
| Abstract:A series of MnCePrO2-δ composite oxide catalysts and precious metal Pt catalysts were coated on the blank DPF prepared by self-propagating high-temperature synthesis (SHS) method and to evaluate the catalytic performance of soot combustion and NOx oxidation. The results showed that the MnCePrO2-δ catalyst had the obvious advantage of better oxidizing performance of soot and NO compared to the DPF carrier which was coated with Pt. Mn0.3Ce0.5Pr0.2 exhibited the best catalytic activity and possessed the lowest soot ignition temperature of 296 ℃ and the temperature of maximum soot oxidation rate is 418 ℃ and the conversion rate of NO oxidation is 65.6%. The effects of gas flow rate and loading soot mass on the catalytic activity of Mn0.3Ce0.5Pr0.2 catalyst were also studied by using programmed temperature-programmed reaction. The research results showed that when the gas flow rate was reduced from 500(mL·min-1)to 100(mL·min-1), the soot ignition temperature and the temperature of maximum soot oxidation rate decreased by 10 ℃ and 20 ℃ respectively, while the change of the loading soot mass had no effect on the ignition temperature and the maximum oxidation rate temperature of soot. |
| Key words: SHS catalyst soot programmed temperature-programmed reaction |
