http://www.cnr.it/ontology/cnr/individuo/prodotto/ID36892

Absorption spectroscopy of toluene pyrolysis. (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Absorption spectroscopy of toluene pyrolysis. (Articolo in rivista) (literal)

Anno

2002-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/S0143-8166(01)00122-1 (literal)

Alternative label

D'Alessio J., Lazzaro M., Massoli P., Moccia V. (2002)
Absorption spectroscopy of toluene pyrolysis.
in Optics and lasers in engineering; Elsevier, Oxford (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

D'Alessio J., Lazzaro M., Massoli P., Moccia V. (literal)

Pagina inizio

495 (literal)

Pagina fine

508 (literal)

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\"Optics and Lasers in Engineering\" aims to provide an international forum for the interchange of information on the development and application of optical techniques and laser technology in engineering. The above-mentioned article has been selected for publication in a 2-part Special Issue of the journal, specifically devoted to \"Optics in Italy\". (literal)

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http://www.journals.elsevier.com/optics-and-lasers-in-engineering/ (literal)

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37 (literal)

Rivista

Optics and lasers in engineering (Rivista)

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Non riportato nel Consuntivo 2002 (literal)

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14 (literal)

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5 (literal)

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The characterization of soot formation and oxidation can lead to its control or suppression in real combustion systems. The present study is focused on the formation of soot precursors in the pre-inception stage. Results are presented for the pyrolysis of toluene, one of the smallest molecules involved in soot inception and growth. The experiments were performed in high temperature and high pressure conditions in a diaphragm-type shock tube, by means of optical diagnostics. Absorption in the near infrared (@ 1300 nm) allowed to retrieve the main features of the carbonaceous particulate formation (soot yield and induction time); the bell-shaped yield was peaked at 1850 K, while the apparent activation energy of the overall process was about 185 kJ/mole. Real-time, high-speed absorption spectroscopy (@ 300-800 nm) permitted to follow the process in situ, aiding the deconvolution of results from sampling techniques. The absorption data were then analyzed via the Tauc optical band-gap model: pyrolysis products were characterized in terms of 'classes' of aromatic clusters, with a different degree of aromatization. Two classes of PAH, with 3-5 and 7-9 fused rings, have been identified in the process. The time evolution of the involved species allowed to highlight the mechanism of nucleation and 'aromatization' of soot particles. The effect of temperature on the pathway to carbonaceous particles was additionally evidenced, confirming the kinetic mechanisms suggested in literature. (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Istituto Motori - C.N.R. (literal)

Titolo

Absorption spectroscopy of toluene pyrolysis. (literal)

Abstract

Toluene pyrolysis in high temperature/high pressure argon atmosphere has been studied in a conventional diaphragm-type shock tube. The investigated ranges of temperature and pressure were 1500-2300 K and 8-13 bar, respectively. Extinction measurements in the near infrared have been carried out to follow the formation of carbonaceous particulate (soot). Pyrolysis products were optically characterized by absorption measurements in the wavelength range 300-800 nm, with high time/spectral resolution. The application of Tauc analysis to the absorption spectra allowed to identify three levels of energy gap; they have been attributed to carbonaceous structures with 3-5 and 7-9 fused aromatic rings, and to soot particles. (literal)

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