Impact of exhaust gas recirculation (EGR) on the oxidative reactivity of diesel engine soot

Khalid Al-Qurashi, André L. Boehman*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    210 Scopus citations


    This paper expands the consideration of the factors affecting the nanostructure and oxidative reactivity of diesel soot to include the impact of exhaust gas recirculation (EGR). Past work showed that soot derived from oxygenated fuels such as biodiesel carries some surface oxygen functionality and thereby possesses higher reactivity than soot from conventional diesel fuel. In this work, results show that EGR exerts a strong influence on the physical properties of the soot which leads to enhanced oxidation rate. HRTEM images showed a dramatic difference between the burning modes of the soot generated under 0 and 20% EGR. The soot produced under 0% EGR strictly followed an external burning mode with no evidence of internal burning. In contrast, soot generated under 20% EGR exhibited dual burning modes: slow external burning and rapid internal burning. The results demonstrate clearly that highly reactive soot can be achieved by manipulating the physical properties of the soot via EGR.

    Original languageEnglish (US)
    Pages (from-to)675-695
    Number of pages21
    JournalCombustion and Flame
    Issue number4
    StatePublished - Dec 1 2008


    • Diesel particulate
    • Exhaust gas recirculation
    • Nanostructure
    • Reactivity
    • Soot oxidation

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Fuel Technology
    • Energy Engineering and Power Technology
    • Physics and Astronomy(all)


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