TY  - JOUR
T1  - Reduction of carbon dioxide particles to carbon monoxide by nonthermal plasma
A1  - Yamasaki, Haruhiko
A1  - Kida, Takafumi
A1  - Kuroki, Tomoyuki
A1  - Okubo, Masaaki
Y1  - 2025///
KW  - Nonthermal plasma
KW  - carbon dioxide
KW  - carbon monoxide
KW  - solid-phase of CO2
KW  - dielectric barrier discharge
JF  - International Journal of Plasma Environmental Science and Technology
VL  - 19
IS  - 1
SP  - e01009
EP  - e01009
DO  - https://doi.org/10.34343/ijpest.2025.19.e01009
UR  - http://ijpest.com/Contents/19/1/e01009.html
N2  - Nonthermal plasma reduces carbon dioxide to carbon monoxide, which can be converted into fuels and organic compounds, and is used as a raw material for gas synthesis. However, the energy efficiency is currently too low for practical use, and innovative ideas are required. This study proposes a CO2 fuel conversion technology using solid CO2 in a nonthermal plasma reactor. The advantages of using solid CO2 are the suppression of the CO re-oxidation reaction at low temperatures and the improvement in energy efficiency at high CO2 concentrations. In the experiment, the plasma reduction of gaseous and solid CO2 is performed using a dielectric barrier discharge plasma reactor, and the conversion and energy efficiencies are compared. The concentration of generated CO is found to be dependent on the concentration of CO2. When nonthermal plasma is applied to solid CO2, Joule heating causes CO2 sublimation, which reduces gaseous CO2 to CO. The solid CO2 in the plasma reactor increases the impedance and decreases the discharge power. The introduction of solid CO2 upstream of the reactor increases the discharge power and improves the CO conversion efficiency. At a specific energy of 1.8 eV/molecule, the reduction of solid CO2 increases the conversion efficiency from 1.4% to 1.8% and the energy efficiency from 2.3% to 2.7%, compared to the reduction of gaseous CO2.
ER  -