Changes in Structure and Reactivity of Soot during Oxidation and Gasification by Oxygen, Studied by Micro-Raman Spectroscopy and Temperature Programmed Oxidation

Figures & data

FIG. 1 Mass ratio (m/m₀) (a, c) and normalized CO₂ signals (b, d) of GfG soot and EURO IV soot during oxidation at increasing temperature (293 K–873 K), heating rate of 5 K/min.

FIG. 2 Raman spectra (λ₀ = 514 nm) of GfG soot (a) and EURO IV soot (b) after oxidation at different temperatures with a heating rate of 5 K/min.

FIG. 3 Exemplary spectrum (λ₀ = 514 nm) of untreated EURO IV soot with five band fits.

FIG. 4 Changes in FWHM of D1 band (a, c) and relative intensity of D3 band (R3) (b, d) for GfG soot and EURO IV soot during oxidation versus temperature.

FIG. 5 Changes in FWHM of D1 band (a) and relative intensity of D3 band (R3) (b) for GfG soot during oxidation versus mass conversion (1 - m/m₀) determined by gravimetry.