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Issue 16, 2019
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Dimers of polycyclic aromatic hydrocarbons: the missing pieces in the soot formation process

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Abstract

The soot nucleation process, defined as the transition from molecular precursors to condensed matter, is the less understood step in the whole soot formation process. The possibility that polycyclic aromatic hydrocarbon (PAH) dimers, especially those containing moderate-sized PAHs, can play a major role in soot nucleation is a very controversial issue. Although PAH dimers have often been considered as potential soot precursors, their formation is not thermodynamically favored at a typical flame temperature, their binding energies being considered too weak to allow them to survive in this environment. Hereby, we report experimental evidence supporting the existence of PAH dimers in the proximity of the soot nucleation region of a methane laminar diffusion flame that gives strong evidence for the nucleation process to be kinetically rather than thermodynamically controlled.

Graphical abstract: Dimers of polycyclic aromatic hydrocarbons: the missing pieces in the soot formation process

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Publication details

The article was received on 21 Jan 2019, accepted on 22 Mar 2019 and first published on 22 Mar 2019


Article type: Paper
DOI: 10.1039/C9CP00394K
Phys. Chem. Chem. Phys., 2019,21, 8282-8294

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    Dimers of polycyclic aromatic hydrocarbons: the missing pieces in the soot formation process

    X. Mercier, O. Carrivain, C. Irimiea, A. Faccinetto and E. Therssen, Phys. Chem. Chem. Phys., 2019, 21, 8282
    DOI: 10.1039/C9CP00394K

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