Journal
JOURNAL OF CO2 UTILIZATION
Volume 46, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2021.101464
Keywords
Microwave plasma; Methane dry reforming; Carbon dioxide; Hydrogen
Funding
- Samsung Research Fund, Sungkyunkwan University
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Atmospheric pressure microwave plasma reforming of methane and carbon dioxide mixture demonstrates high conversion rates into hydrogen and carbon monoxide at temperatures up to 5900 K. A reactor network-type simulation reveals that reforming occurs through the flow mixing with surrounding gas entering and diffusing out of the plasma stream, as well as heating of the surrounding stream by the plasma stream.
Atmospheric pressure microwave plasma reforming was conducted on a methane (CH4) and carbon dioxide (CO2) mixture, and characterized by measuring the temperature of the plasma and gas composition of the reforming product via optical emission spectroscopy (OES) and gas chromatographic measurement. The temperature at the plasma reached as high as 5900 K regardless of the specific energy input, while at microwave power of 2 kW and flow rate of 10 slm, nearly all CH4 and CO2 were converted into hydrogen (H2) and carbon monoxide (CO). The plasma temperature higher than the level achievable from uniform gas heating implied that only a part of the flow will enter the plasma region, and the rest will bypass and mix with the plasma stream downstream. Thus, a reactor network-type simulation was performed by modeling the plasma and surrounding streams, each as a series of perfectly-stirred reactors; the reactors at the same downstream locations interacted for the gas diffusion and heat conduction. The simulation reproduced the measured gas compositions well, revealing that the reforming proceeded as the surrounding gas enters and diffuses out of the plasma stream due to the flow mixing, as well as through the heating of the surrounding stream by the plasma stream.
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