1. Insight into gliding arc (GA) plasma reduction of CO2 with H2: GA characteristics and reaction mechanism.
- Author
-
Jing-Bao Liu, Xiao-Song Li, Jing-Lin Liu, and Ai-Min Zhu
- Subjects
ELECTRON temperature ,THERMAL plasmas ,LOW temperature plasmas ,ELECTRON density ,ARC length ,ENERGY conversion - Abstract
As an intermedia between cold and thermal plasmas, warm plasma generated by gliding arc (GA) discharge possesses high conversions and high energy efficiencies for CO
2 conversion. However, there is little understanding for the arc characteristics in CO2 -based atmosphere and reaction mechanism of CO2 in GA plasma from experimental approach. For this purpose, a magnetically driven GA plasma with a constant length of arc is designed to study GA characteristics and reaction mechanism by changing H2 /CO2 molar ratio (from pure CO2 to pure H2 ). In the entire range of H2 /CO2 ratio, the arc channel shows a glow-like feature. The plasma parameters are arc temperature of 2200–3600 K, electron density of ~1.6 × 1014 cm−3 and electron temperature of ~3 eV. From pure CO2 to pure H2 , arc diameter decreases from 1.3 to 0.6 mm, whereas rotational frequency increases from 20 to 64 Hz. Based upon the optical emission spectra of CO, OH, H and O species, chemluminescence spectra of CO and O recombination and CO production rate detected online by gas chromatographs, the reaction mechanism at low and high H2 /CO2 molar ratios is disclosed. [ABSTRACT FROM AUTHOR]- Published
- 2019
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