Thermogravimetric analysis of soot emitted by a modern diesel engine run on catalyst-doped fuel
Thermogravimetric analysis of soot emitted by a modern diesel engine run on catalyst-doped fuel
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DOI：
10.1016/s0010-2180(02)00432-7
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发表时间：
2003
影响因子：
4.4
通讯作者：
G. Stratakis;A. Stamatelos
中科院分区：
文献类型：
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作者：
G. Stratakis;A. Stamatelos
了解在200 ~ 400℃温度范围内影响多孔陶瓷柴油微粒过滤器（DPF）催化活性的机制，对于成功模拟燃料添加剂催化再生的开始和演变具有重要意义。这不仅指干燥的碳颗粒，还指吸附在其上的挥发性碳氢化合物。本文采用热重法和差示扫描量热分析（TGA-DSC）技术，详细分析了现代柴油机排放的柴油颗粒在碳化硅柴油滤清器上的碳氢化合物吸附-解吸和氧化行为。非等温试验直接从连接到柴油发动机排气系统的陶瓷过滤器中收集样品，在低速和中速以及有和没有燃料添加剂的负载工况下运行。研究了不同燃料添加剂浓度对油烟氧化性能的影响。根据热重分析数据，计算了烟尘氧化反应的动力学参数。通过比较在过滤器加载阶段不同排气温度下从过滤器中心和外围采集的样品的计算活化能，评价挥发性吸附碳氢化合物对烟灰氧化反应的影响。特别指出的是，由于挥发性有机成分的存在，燃料添加剂的催化活性得到了增强。
Understanding the mechanisms that affect catalytic activity in porous ceramic diesel particulate filters (DPF) at the temperature range 200 to 400°C is important for the successful modeling of the initiation and evolution of catalytic regeneration by use of fuel additives. This refers not only to the dry carbon particulate, but also to the volatile hydrocarbons adsorbed on it. In this paper, a detailed analysis of the hydrocarbon adsorption-desorption and oxidation behavior of diesel particulate emitted by a modern diesel engine and collected on a SiC diesel filter is performed by use of thermogravimetric and differential scanning calorimetry analysis (TGA-DSC). Non-isothermal tests were performed with samples collected directly from a ceramic filter connected to the exhaust system of the diesel engine running under low and medium speed and load operating conditions with and without fuel additive. Fuel additive concentration was varied to investigate its effect on the soot oxidation behavior. Based on the TGA data, the kinetic parameters of the soot oxidation reaction were calculated. The effect of volatile adsorbed hydrocarbons on the soot oxidation reaction was evaluated by comparing the calculated activation energies for samples collected from the center and the periphery of the filter at various exhaust temperatures prevailing at filter loading phase. In particular it was seen that the catalytic activity of the fuel additive is enhanced by the presence of the volatile organic components.