Identification of large polycyclic aromatic hydrocarbons in carbon particulates formed in a fuel-rich premixed ethylene flame

被引：47

作者：

Alfe, Michela ^{[1
]}

Apicella, Barbara ^{[1
]}

Tregrossi, Antonio ^{[1
]}

Ciajolo, Anna ^{[1
]}

机构：

[1] CNR, Ist Ric Combust, I-80125 Naples, Italy

来源：

CARBON | 2008年 / 46卷 / 15期

关键词：

D O I：

10.1016/j.carbon.2008.08.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

Large polycyclic aromatic hydrocarbons were identified in carbon particulate sampled in a fuel-rich premixed ethylene flame. The particulate was extracted with dichloromethane (DCM) in order to separate the soluble organic species (DCM-extract) from the solid carbon (soot). After DCM extraction soot was re-extracted with N-methyl pyrrolidone (NMP) obtaining the NMP-extract. Both the DCM-extract and NMP-extract were further fractionated by size exclusion chromatography in selected molecular weight (MW) ranges. Large polycyclic aromatic hydrocarbons obtained by regular incorporation of C-2 and/or C2H2 unit (24/26 rule) occurring in both odd and even series of carbon atom number of polycyclic aromatic hydrocarbons, were identified by laser desorption ionization-mass spectrometry (LDI-MS) analysis of the lighter MW fractions of both the DCM-extract and NMP-extract (100-400 u MW of the DCM-extract and 200-600 u fractions of the NMP-extract). The LDI-MS spectra of the heaviest MW fractions of DCM-extract and NMP-extract (600-2000 u and 600-5000 u fraction) showed a continuous spectrum of masses typical of polymeric structures. The UV-visible absorption and emission spectral analysis corroborated the assignment of lighter and of heavier fractions of DCM-extract and NMP-extract to PAH and to polymeric aromatic structures, respectively. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2059 / 2066

页数：8

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