Abstract
Electrodeless microwave plasmas in carbon dioxide at atmospheric pressure have been studied for carbon dioxide decomposition. Plasma optical emission spectroscopy has been conducted to measure ro-vibrational temperatures of the plasma. It is found that the temperature reaches 6200 K at the plasma center and there is little difference between the trans-rotational and vibrational temperatures. Kinetic simulations considering the trans-rotational, vibrational, and electron temperatures separately are also conducted to investigate the details of the plasma decomposition of carbon dioxide. As observed in the measurements, the kinetic simulation demonstrated that the difference between the trans-rotational and vibrational temperatures is negligible, and all the carbon dioxide within the plasma is found to be decomposed into carbon monoxide and atomic oxygen, as a result of the extremely high temperatures of the plasma. The carbon monoxide and oxygen then recombine as the temperature decreases, forming mostly carbon dioxide at the reactor exit. From the results, although the electrons in the microwave plasma selectively populate the molecules' vibrational states, the fast relaxation of these excited vibrational states raises the gas temperature instead of resulting in accumulative vibrational excitation for the efficient decomposition of carbon dioxide.
| Original language | English |
|---|---|
| Article number | 033303 |
| Journal | Journal of Applied Physics |
| Volume | 122 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2017 Jul 21 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Experimental and numerical studies on carbon dioxide decomposition in atmospheric electrodeless microwave plasmas. / Sun, Hojoong; Lee, Jungwun; Do, Hyungrok; Im, Seong Kyun; Soo Bak, Moon.
In: Journal of Applied Physics, Vol. 122, No. 3, 033303, 21.07.2017.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Experimental and numerical studies on carbon dioxide decomposition in atmospheric electrodeless microwave plasmas
AU - Sun, Hojoong
AU - Lee, Jungwun
AU - Do, Hyungrok
AU - Im, Seong Kyun
AU - Soo Bak, Moon
PY - 2017/7/21
Y1 - 2017/7/21
N2 - Electrodeless microwave plasmas in carbon dioxide at atmospheric pressure have been studied for carbon dioxide decomposition. Plasma optical emission spectroscopy has been conducted to measure ro-vibrational temperatures of the plasma. It is found that the temperature reaches 6200 K at the plasma center and there is little difference between the trans-rotational and vibrational temperatures. Kinetic simulations considering the trans-rotational, vibrational, and electron temperatures separately are also conducted to investigate the details of the plasma decomposition of carbon dioxide. As observed in the measurements, the kinetic simulation demonstrated that the difference between the trans-rotational and vibrational temperatures is negligible, and all the carbon dioxide within the plasma is found to be decomposed into carbon monoxide and atomic oxygen, as a result of the extremely high temperatures of the plasma. The carbon monoxide and oxygen then recombine as the temperature decreases, forming mostly carbon dioxide at the reactor exit. From the results, although the electrons in the microwave plasma selectively populate the molecules' vibrational states, the fast relaxation of these excited vibrational states raises the gas temperature instead of resulting in accumulative vibrational excitation for the efficient decomposition of carbon dioxide.
AB - Electrodeless microwave plasmas in carbon dioxide at atmospheric pressure have been studied for carbon dioxide decomposition. Plasma optical emission spectroscopy has been conducted to measure ro-vibrational temperatures of the plasma. It is found that the temperature reaches 6200 K at the plasma center and there is little difference between the trans-rotational and vibrational temperatures. Kinetic simulations considering the trans-rotational, vibrational, and electron temperatures separately are also conducted to investigate the details of the plasma decomposition of carbon dioxide. As observed in the measurements, the kinetic simulation demonstrated that the difference between the trans-rotational and vibrational temperatures is negligible, and all the carbon dioxide within the plasma is found to be decomposed into carbon monoxide and atomic oxygen, as a result of the extremely high temperatures of the plasma. The carbon monoxide and oxygen then recombine as the temperature decreases, forming mostly carbon dioxide at the reactor exit. From the results, although the electrons in the microwave plasma selectively populate the molecules' vibrational states, the fast relaxation of these excited vibrational states raises the gas temperature instead of resulting in accumulative vibrational excitation for the efficient decomposition of carbon dioxide.
UR - http://www.scopus.com/inward/record.url?scp=85025133645&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85025133645&partnerID=8YFLogxK
U2 - 10.1063/1.4994008
DO - 10.1063/1.4994008
M3 - Article
AN - SCOPUS:85025133645
VL - 122
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 3
M1 - 033303
ER -