Revisiting iron oxidation chemistry in synthesis flames: Insights from a shock-tube study with intracavity laser absorption spectroscopy tracking of FeO

• Published in: Applications in energy and combustion science 2023-09, Vol.15, p.100184, Article 100184
• Main Authors: Lalanne, Matthieu R., Mujaddadi, Sheikh Ahmed, Fjodorow, Peter, Cheskis, Sergey, Somnitz, Holger, Wlokas, Irenaeus, Herzler, Jürgen, Fikri, Mustapha, Schulz, Christof, Rahinov, Igor
• Format: Article
• Language: English
• Subjects: Flame synthesis; Intracavity absorption spectroscopy; Iron oxidation; Shock tube
• ISSN: 2666-352X; 2666-352X
• DOI: 10.1016/j.jaecs.2023.100184

Proposed highlights for the manuscript titled “Revisiting iron oxidation chemistry in synthesis flames: insights from a shock-tube study with intracavity laser absorption spectroscopy tracking of FeO” submitted to the journal applications in energy and combustion science by M. Lalanne et al. are listed in the following:.•Reaction between fe and O2 was studied in the 1050–3400 K temperature range.•ICAS monitors fe oxidation directly by detecting FeO.•Oscillator strengths of 41 spectral transitions of FeO are reported.•Distinct temperature regimes of fe oxidation by O2 are demonstrated. The reaction between Fe atoms and O2 in a mixture of iron-pentacarbonyl (IPC, 2 ppm) and oxygen (100 ppm), diluted in argon, has been studied in a shock tube behind reflected shock waves over the temperature and pressure ranges of 1050–3400 K and 0.7–2.0 bar. Time-resolved measurements of Fe and FeO have been performed simultaneously using a combination of atomic resonance absorption spectroscopy (ARAS) and intracavity laser absorption spectroscopy (ICAS) with a custom-made broadband dye laser, respectively. For ICAS, absorption features in the spectral range from 16,316 to 16,353 cm−1 have been evaluated, and the oscillator strengths for all 41 assigned ro-vibronic transitions have been expressed. For most of the experimental cases, the measured Fe and FeO traces agreed well with the mechanism reported in this work. The quantitative and highly-sensitive measurements revealed the presence of FeO at temperatures below 1400 K, leading to a reconsideration of rate coefficients for different Fe oxidation channels.