Organo-Pd compounds as fuel additives are proven to have distinct catalytic effects on enhancing ignition and combustion performance. However, their effects on soot emission and the mechanism are not well-established. In this study, the effect of palladium acetylacetonate (Pd(C₅H₇O₂)₂, Pd(acac)₂) on soot formation and growth was investigated experimentally. Different concentrations of Pd(acac)₂ were added in the ethylene flames. Synchrotron small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) were used to detect the soot particles to obtain the size, shape and morphology information. The results show that the Pd(acac)₂ addition with low concentration (100 ppm) suppresses the formation and growth of the primary soot particles at each height above the burner. As the addition concentration increases to 200 and 300 ppm, the size and volume fraction of the soot particles are decreased at the low flame region, and increased at the high flame region. Detailed size distribution, morphology and nanostructure information of the soot particles at different flame heights are discussed.

已证明有机钯化合物作为燃料添加剂对增强点火和燃烧性能具有明显的催化作用。但是，它们对烟尘排放及其机理的影响尚不清楚。在这项研究中，实验研究了乙酰丙酮钯（Pd（C ₅ H ₇ O ₂）₂，Pd（acac）₂）对烟灰形成和生长的影响。在乙烯火焰中添加了不同浓度的Pd（acac）₂。使用同步加速器小角X射线散射（SAXS）和透射电子显微镜（TEM）检测烟灰颗粒，以获得尺寸，形状和形态信息。结果表明，Pd（acac）₂添加低浓度（100 ppm）的碳粉可以抑制燃烧器上方每个高度的初级烟灰颗粒的形成和生长。当添加浓度增加到200和300 ppm时，烟灰颗粒的尺寸和体积分数在低火焰区域减小，而在高火焰区域增大。讨论了不同火焰高度下烟灰颗粒的详细尺寸分布，形态和纳米结构信息。