Time-resolved Mid-infrared Measurements of Hydrogen Peroxide in the Low-temperature Oxidation of Iso-octane in a Rapid Compression Machine

ABSTRACT

Time-resolved quantitative measurements of hydrogen peroxide (H₂O₂) in the low-temperature oxidation of iso-octane in a rapid compression machine have been performed using mid-infrared absorption spectroscopy. H₂O₂ was detected in the 8-μm region, wherein H₂O₂ has the strongest absorption band. Owing to the weak interference of the absorption of iso-octane and H₂O in the 8-μm region, H₂O and iso-octane were detected in the 1.4- and 3.5-μm region, respectively. The cross-sections of H₂O₂ and H₂O were calculated using parameters in the HITRAN database, and the iso-octane cross-section was measured using a rapid compression machine in the temperature and pressure ranges of 417–700 K and 100–700 kPa, respectively. The time-resolved quantitative H₂O₂ profiles in the low-temperature oxidation of iso-octane at 0.77 MPa, 642 and 660 K, and an equivalence ratio of 1.0 were successfully obtained. The H₂O and iso-octane profiles were also obtained using this measurement method; the simultaneous measurements of the quantitative time profiles of multi-species in the low-temperature oxidation of fuels are also novel. Under experimental conditions, H₂O₂ was formed during the low-temperature oxidation of iso-octane, and its concentration gradually increased between the end of the low-temperature oxidation and start of the high-temperature oxidation. The calculated H₂O₂ profiles obtained using the latest chemical kinetic model of iso-octane showed the same tendency as the experimental profiles.

KEYWORDS:

• Hydrogen peroxide
• mid-infrared spectroscopy
• rapid compression machine
• low-temperature oxidation
• iso-octane

Acknowledgments

The authors thank Mr. Hideaki Saitou and Mr. Yoshiaki Yamadaya for their help with the experiments. This study was partly supported by the Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Innovative Combustion Technology” (Funding agency: JST), JSPS Grants-in-Aid for Scientific Research (18K03966).

Additional information

Funding

This work was supported by the Japan Society for the Promotion of Science [18K03966] and the Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Innovative Combustion Technology” (Funding agency: JST).