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S-PAH, oxy-PAH and EPA-PAH formation during ethylene-SO<inf>2</inf> pyrolysis

Abstract:

Oxygenated polycyclic aromatic hydrocarbons (oxy-PAH) and sulphurated polycyclic aromatic hydrocarbons (S-PAH) formation during pyrolysis experiments of mixtures of ethylene (3%) and several SO2 concentrations (0.3 to 1%), at different reaction temperatures (1075 to 1475 K), was studied. The sixteen EPA-PAH priority pollutants, classified by the Environmental Protection Agency (EPA), were also analyzed. Oxy-PAH, S-PAH and EPA-PAH were jointly identified and quantified by gas chromatography–mass spectrometry (GC–MS). Soot formation and the main gases concentration at the gas reactor outlet were also analyzed. The main results showed that oxy-PAH, S-PAH and EPA-PAH were formed in all the experiments carried out. Both ratios, oxy-PAH/EPA-PAH and S-PAH/EPA-PAH, were found to increase with the temperature and with the SO2 inlet concentration.