TY - JOUR
T1 - CO 2 / CH 4 Glow Discharge Plasma
T2 - Part I—Experimental and Numerical Study of the Reaction Pathways
AU - Baratte, Edmond
AU - Garcia-Soto, Carolina A.
AU - Silva, Tiago
AU - Guerra, Vasco
AU - Parvulescu, Vasile I.
AU - Guaitella, Olivier
N1 - Publisher Copyright:
© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2023.
PY - 2024/5/1
Y1 - 2024/5/1
N2 - A fundamental study of CO2/CH4 plasma is performed in a glow discharge at a few Torr. Experimental and numerical results are compared to identify the main reaction pathways. OES-based techniques and FTIR (Fourier Transform Infrared) spectroscopy are used to determine molecules densities and gas temperature. Several conditions of pressure, initial mixture and residence time are measured. The main dissociation products are found to be CO and H2. The LoKI simulation tool was used to build a simplified kinetic scheme to limit the uncertainties on rate coefficients, but sufficient to reproduce the experimental data. To this aim, only molecules containing at most one carbon atom are considered based on the experimental observations. Obtaining a good match between the experimental data and the simulation requires the inclusion of reactions involving the excited state O(1D). The key role of CH3 radical is also emphasized. The good match obtained between the experiment and the simulation allows to draw the main reaction pathways of the low-pressure CO2-CH4 plasmas, in particular to identify the main back reaction mechanisms for CO2. The role of CH2O and H2O in the gas phase is also discussed in depth as they appear to play an important role on catalytic surface studied in the part II of this study.
AB - A fundamental study of CO2/CH4 plasma is performed in a glow discharge at a few Torr. Experimental and numerical results are compared to identify the main reaction pathways. OES-based techniques and FTIR (Fourier Transform Infrared) spectroscopy are used to determine molecules densities and gas temperature. Several conditions of pressure, initial mixture and residence time are measured. The main dissociation products are found to be CO and H2. The LoKI simulation tool was used to build a simplified kinetic scheme to limit the uncertainties on rate coefficients, but sufficient to reproduce the experimental data. To this aim, only molecules containing at most one carbon atom are considered based on the experimental observations. Obtaining a good match between the experimental data and the simulation requires the inclusion of reactions involving the excited state O(1D). The key role of CH3 radical is also emphasized. The good match obtained between the experiment and the simulation allows to draw the main reaction pathways of the low-pressure CO2-CH4 plasmas, in particular to identify the main back reaction mechanisms for CO2. The role of CH2O and H2O in the gas phase is also discussed in depth as they appear to play an important role on catalytic surface studied in the part II of this study.
KW - Benchmark experiment
KW - CO-CH
KW - Glow discharge
KW - Loki kinetic model
KW - Methanation
UR - https://www.scopus.com/pages/publications/85178428533
U2 - 10.1007/s11090-023-10421-z
DO - 10.1007/s11090-023-10421-z
M3 - Article
AN - SCOPUS:85178428533
SN - 0272-4324
VL - 44
SP - 1237
EP - 1286
JO - Plasma Chemistry and Plasma Processing
JF - Plasma Chemistry and Plasma Processing
IS - 3
ER -