Fundamental studies on effect of ozone injection to the internal-combustion engine - FTIR spectrum of hydrocarbon compound reformulated by ozone

The mixture gas composed of hydrocarbon compounds and air/O₂ exposed to discharge was analysed by FTIR. The emission spectroscopy of combustion in the enriched condition of O₂ and O₃ was not very different because it was assumed that the consumption of O atoms required for combustion was consistent. The spectrum around 1750 cm^-1 of the mixture gas, which did not appear before discharge, was detected by FTIR. The generation rate of the by-product around 1750 cm^-1 strongly relates with O₃ concentration. It was suggested that O₃ is the major molecule reacting with vaporised hydrocarbon compounds. A candidate for the by-product was supposed to be C₈H₁₆O or/and C ₈H₁₆O₂ from the reference absorption spectra of FTIR. The by-product was produced with thin O₃ concentration, which was 0.62 g/m³ in the test, although O₃ was emitted as extra when injected O₃ was more than approximately 2 g/m³.