The fate of metal (Fe) during diesel combustion: Morphology, chemistry, and formation pathways of nanoparticles

Art Miller, Gib Ahlstrand, David Kittelson, Michael Zachariah

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

This report describes an investigation in which we used iron-doped diesel fuel to generate metal-bearing diesel particles and a subsequent analysis of the particles using transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS). For this study, DPM was generated by a 1.5-L diesel engine and the fuel was doped with ferrocene to enhance the level of iron in the system. The exhaust particles were collected on TEM grids and analyzed using the Philips CM12 TEM/EDS instrument. Results show that when the iron-to-carbon (soot) ratio (Fe/C) in the engine is low, the exhaust particles have morphologies similar to those for the undoped case, but at a threshold Fe/C value of 0.013 (for this engine), homogeneously nucleated metallic nanoparticles are formed and begin agglomerating. The number and size of these nanoparticles increase with level of doping. Metal-bearing particles that span a wider size range are also formed. Agglomeration of metallic and carbon particles is observed in two distinct modes: attachment of iron primary particles (5-10 nm in diameter) to carbon agglomerates, and coagulation of iron agglomerates (20-200 nm in diameter) with carbon agglomerates. Results of this work imply that as new engine technologies reduce soot levels in the engine and/or levels of trace metals in the fuel are increased, the generation of metallic nanoparticles may ensue, creating a potential health concern.

Original languageEnglish (US)
Pages (from-to)129-143
Number of pages15
JournalCombustion and Flame
Volume149
Issue number1-2
DOIs
StatePublished - Apr 2007

Keywords

  • Metal emissions
  • Metallic particles
  • Nanoparticles
  • Particulate emissions

Fingerprint

Dive into the research topics of 'The fate of metal (Fe) during diesel combustion: Morphology, chemistry, and formation pathways of nanoparticles'. Together they form a unique fingerprint.

Cite this