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Effect of oxidation catalysts on diesel soot particles

机译：氧化催化剂对柴油机烟尘颗粒的影响

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The effect of a conventional oxidation catalyst and a novel particle oxidation catalyst (POC) on diesel particles is studied using identical methodology. Regulated particulate matter emission measurement is followed by analyzing soluble organic fraction. In addition, size distributions are measured using a partial flow sampling system with a thermodenuder as an option. A parallel ELPI-SMPS method is used to study the particle effective density and, further, the mass. Tests are conducted using a heavy duty diesel engine with a very low sulfur fuel. A decrease in particle mass was observed when using a catalyst. When using a conventional catalyst the decrease was attributed to the decrease of soluble organic fraction, while using POC the nonsoluble fraction was also found to decrease, by 8-38%. This observation is confirmed by particle number measurement, and POC was found to decrease the dry particle number concentration measured downstream of a thermodenuder by 13-28%. Further particle structure analysis indicated lower density values when using conventional catalyst or POC. The physical size of the particles was not changed noticeably over either catalystsimplying the soluble organic fraction was condensed onto the soot, filling the voids in the porous structure of soot agglomerates, when no catalyst is used.
机译：使用相同的方法研究了常规氧化催化剂和新型颗粒氧化催化剂（POC）对柴油颗粒的影响。调节颗粒物排放测量之后，分析可溶有机部分。此外，尺寸分布是使用带有热剥蚀器（可选）的部分流量采样系统测量的。并行ELPI-SMPS方法用于研究粒子的有效密度以及质量。使用含硫量极低的重型柴油发动机进行测试。当使用催化剂时，观察到颗粒质量的降低。当使用常规催化剂时，减少归因于可溶性有机部分的减少，而使用POC时，非可溶性部分也减少了8-38％。该观察结果通过颗粒数测量得到证实，并且发现POC使在热剥蚀器下游测量的干颗粒数浓度降低了13-28％。进一步的颗粒结构分析表明，使用常规催化剂或POC时密度值较低。在没有使用催化剂的情况下，两种催化剂上的颗粒的物理尺寸均未发生明显变化，这意味着可溶有机部分被冷凝到煤烟上，从而填充了烟煤附聚物多孔结构中的空隙。

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