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Pyrolysis of methane is a promising, new, greenhouse gas-free production method of hydrogen. Here, we present optical emission spectra of a microwave plasma torch operated in an argon methane mixture. Detailed spatial resolution is achieved by means of Abel inversion. The emission spectra are dominated by dicarbon Swan bands and black body radiation from carbon nanoparticles. Both spectral features are utilized to estimate the gas temperature. In the center of the plasma, gas temperatures of up to 4300 K are reached with large gradients (500 K/mm) in radial direction. The thermal equilibrium chemistry and the kinetics of methane pyrolysis are analyzed to explain the observed coupling between the local gas temperature and the local emission.
| Field | Value |
|---|---|
| Publisher | |
| Authors | |
| Release Date | 2024-04-09 |
| Identifier | 89553198-d185-4541-9ea3-456a581d6cb5 |
| Permanent Identifier (URI) | |
| Is supplementing | |
| Plasma Source Name | |
| Plasma Source Application | |
| Plasma Source Specification | |
| Plasma Source Properties | 900-1800 W |
| Language | English (United States) |
| License | |
| Plasma Medium Name | |
| Plasma Medium Properties | 60-80 slm, Argon-methane-mixture, 4-8 %vol CH4 |
| Contact Name | Kreuznacht, Simon |
| Contact Email | |
| Public Access Level | Public |
| Plasma Diagnostic Name | |
| Funding Agency | |
| Project | |
| Subproject |
Data and Resources
- Figure 2_Uncalibrated overview spectrum.txt
Uncalibrated overview spectrum of the emission from the microwave plasma...
Download - Figure 3_Radially resolved amplitudes and temperaturestxt
Radially resolved measured values for the amplitudes of the black body...
Download - Figure 7_Thermal equilibrium mole fractionstxt
Mole fractions of hydrogen, dicarbon, methane, and solid carbon in thermal...
Download - Figure 8a_Methane Pyrolysis Kinetics at 1400 Ktxt
Comparison of the kinetics of methane pyrolysis at a pressure of 1 atm and...
Download - Figure 8b_Methane Pyrolysis Kinetics at 2100 Ktxt
Comparison of the kinetics of methane pyrolysis at a pressure of 1 atm and...
Download - Figure 8c_Methane Pyrolysis Kinetics at 3600 Ktxt
Comparison of the kinetics of methane pyrolysis at a pressure of 1 atm and...
Download - Figure C1a_Simulated dicarbon Swan bands Delta v=2txt
Simulated spectrum of the Delta v=2 band sequence of the dicarbon Swan bands...
Download - Figure C1b_Simulated dicarbon Swan bands Delta v=1txt
Simulated spectrum of the Delta v=1 band sequence of the dicarbon Swan bands...
Download - Figure C1c_Simulated dicarbon Swan bands Delta v=0txt
Simulated spectrum of the Delta v=0 band sequence of the dicarbon Swan bands...
Download - Figure C1d_Simulated dicarbon Swan bands Delta v=-1txt
Simulated spectrum of the Delta v=-1 band sequence of the dicarbon Swan...
Download - Figure C1e_Simulated dicarbon Swan bands Delta v=-2txt
Simulated spectrum of the Delta v=-2 band sequence of the dicarbon Swan...
Download - Figure C2_NMSSE between two simulated spectra as a function of the rotational temperaturetxt
NMSSE between two simulated spectra of the five band sequences of the...
Download - Figure C3a_NMSSE between two simulated spectra as a function of the rotational temperature and the full width at half maximum Delta v=2txt
NMSSE between two simulated spectra of the Delta v=2 band sequence of the...
Download - Figure C3b_NMSSE between two simulated spectra as a function of the rotational temperature and the full width at half maximum Delta v=1txt
NMSSE between two simulated spectra of the Delta v=1 band sequence of the...
Download - Figure C3c_NMSSE between two simulated spectra as a function of the rotational temperature and the full width at half maximum Delta v=0txt
NMSSE between two simulated spectra of the Delta v=0 band sequence of the...
Download - Figure C3d_NMSSE between two simulated spectra as a function of the rotational temperature and the full width at half maximum Delta v=-1txt
NMSSE between two simulated spectra of the Delta v=-1 band sequence of the...
Download - Figure C3e_NMSSE between two simulated spectra as a function of the rotational temperature and the full width at half maximum Delta v=-2txt
NMSSE between two simulated spectra of the Delta v=-2 band sequence of the...
Download - Figure C4a_NMSSE between two simulated spectra as a function of the rotational and vibrational temperatures Delta v=2txt
NMSSE between two simulated spectra of the Delta v=2 band sequence of the...
Download - Figure C4b_NMSSE between two simulated spectra as a function of the rotational and vibrational temperatures Delta v=1txt
NMSSE between two simulated spectra of the Delta v=1 band sequence of the...
Download - Figure C4b_NMSSE between two simulated spectra as a function of the rotational and vibrational temperatures Delta v=0txt
NMSSE between two simulated spectra of the Delta v=0 band sequence of the...
Download - Figure C4d_NMSSE between two simulated spectra as a function of the rotational and vibrational temperatures Delta v=-1txt
NMSSE between two simulated spectra of the Delta v=-1 band sequence of the...
Download - Figure C4d_NMSSE between two simulated spectra as a function of the rotational and vibrational temperatures Delta v=-2txt
NMSSE between two simulated spectra of the Delta v=-2 band sequence of the...
Download - Figure C5_Boltzmann plottxt
Boltzmann plot for an emission spectrum determined using Abel inversion from...
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