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Thermogravimetric analysis of soot emitted by a modern diesel engine run on catalyst-doped fuel

机译：现代柴油机在掺杂催化剂的燃料下排放的烟尘的热重分析

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摘要

Understanding the mechanisms that affect catalytic activity in porous ceramic diesel particulate filters (DPF) at the temperature range 200 to 400℃ 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.
机译：了解在200至400℃温度范围内影响多孔陶瓷柴油机微粒过滤器（DPF）催化活性的机制，对于成功地通过使用燃料添加剂对催化再生的引发和演化进行建模非常重要。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。本文利用热重分析和差示扫描量热法（TGA-DSC）对现代柴油机排放并收集在SiC柴油滤清器上的柴油机颗粒的碳氢化合物吸附-脱附和氧化行为进行了详细分析。非等温测试是使用直接从陶瓷过滤器收集的样品进行的，该陶瓷过滤器连接到柴油机排气系统，在低速和中速以及负载运行条件下（有或没有燃料添加剂）运行。改变燃料添加剂的浓度以研究其对烟灰氧化行为的影响。基于TGA数据，计算了烟灰氧化反应的动力学参数。通过比较在过滤器加载阶段盛行的各种排气温度下，从过滤器中心和外围收集的样品的计算出的活化能，来评估挥发性吸附烃对烟灰氧化反应的影响。特别地，可以看出，挥发性有机组分的存在增强了燃料添加剂的催化活性。

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