UV SPECTRAL IDENTIFICATION OF POLYCYCLIC AROMATIC HYDROCARBON PRODUCTS OF SUPERCRITICAL 1-METHYLNAPHTHALENE PYROLYSIS

Author： Somers Michelle L. Wornat Mary J.

ISSN： 1040-6638

Source： Polycyclic Aromatic Compounds, Vol.27, Iss.4, 2007-08, pp. : 261-280

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

In order to study the formation of carbonaceous solid deposits from fuels used in next-generation jet aircraft, we have pyrolyzed the model fuel 1-methylnaphthalene, a 2-ring aromatic component of jet fuel, at 585°C, 110 atm, and 140 sec. The products from the reaction have been analyzed by high-pressure liquid chromatography (HPLC) with ultraviolet-visible (UV) diode-array detection in series with a mass spectrometer. Over thirty individual polycyclic aromatic hydrocarbons (PAH) have been identified from their HPLC retention times, mass spectra, and UV absorbance and/or fluorescence spectra. Of these identified products, 16 have never before been identified as products of 1-methylnaphthalene pyrolysis or combustion, including: dibenzo[a,i]fluorene and three methyldibenzo[a,i]fluorenes; dibenzo[a,g]fluorene and one methyldibenzo[a,g]fluorene; three methyldibenzo[a,h]fluorenes; benzo[c]chrysene; naphtho[2,1-a]pyrene and three methylnaphtho[2,1-a]-pyrenes; naphtho[2,3-a]pyrene; and dibenzo[cd,lm]-perylene. The identification of these products is an essential step in the development of reaction schemes for the formation of PAH and ultimately carbonaceous solids in the supercritical fuel pyrolysis environment. PAH with molecular masses 402 and 426 have also been detected by the mass spectrometer, indicating the presence of 8-ring C32H18 and 9-ring C34H18 PAH. The identification of these 8- and 9-ring products is the subject of ongoing research.