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 C8H16O2 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