Microstructure and oxidation behaviour of Euro IV diesel engine soot: A comparative study with synthetic model soot substances

D. S. Su, R. E. Jentoft, J. O. Müller, D. Rothe, E. Jacob, C. D. Simpson, Ž Tomović, K. Müllen, A. Messerer, U. Pöschl, R. Niessner, R. Schlögl

Research output: Contribution to journalArticleAcademicpeer-review

121 Citations (Scopus)

Abstract

In this study, the microstructure and oxidation behaviour of soot from the raw exhaust of a Euro IV test heavy duty (HD) diesel engine are investigated and compared to that of spark-discharge soot and hexabenzocoronene (HBC, C 42H18). We find a microstructure-controlled reactivity towards oxidation of all three samples in 5% O2 in N2. The spark-discharge soot with its fine primary particles and fullerenoid structure has an onset temperature of 423K for combustion, while the HBC with its well-ordered crystallites has a high onset temperature of 773K. Due to an improved combustion process in the Euro IV HD diesel engine, the emitted soot consists of more fullerenoid- or onion-like particles agglomerated in a chain-like secondary structure. The onset temperature of the Euro IV HD engine soot combustion is 573K. Oxidation of the three samples produces only CO 2 and H2O. The different H2O production profiles can be assigned to the functionalised surface of the samples and depend on the soot structure and preparation route.

Original languageEnglish
Pages (from-to)127-132
Number of pages6
JournalCatalysis Today
Volume90
Issue number1-2
DOIs
Publication statusPublished - 15 Jun 2004
Externally publishedYes
EventAir Pollution Abatement Symposium - Innsbruck, Austria
Duration: 31 Aug 200331 Aug 2003

Keywords

  • Euro IV HD diesel engine soot
  • HBC
  • Soot microstructure
  • Soot oxidation

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