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

134 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
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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