Dielectric barrier micro-plasma reactor with segmented outer electrode for decomposition of pure CO<sub>2</sub>

doi:10.1007/s11705-020-1974-1

Front. Chem. Sci. Eng.

2021, Vol. 15

Issue (3) : 687-697 https://doi.org/10.1007/s11705-020-1974-1

RESEARCH ARTICLE

Dielectric barrier micro-plasma reactor with segmented outer electrode for decomposition of pure CO₂

Baowei Wang¹(

), Xiaoxi Wang¹, Bo Zhang²

¹. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
². Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China

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Abstract

Four coaxial cylinder dielectric barrier discharge micro-plasma reactors were designed for the non-catalytic decomposition of pure CO₂ into CO and O₂ at low temperature and ambient pressure. The influence of segmented outer electrodes on the electrical characteristics and the reaction performance was investigated. Experimental results indicated that the introduction of segmented outer electrodes can significantly promote the decomposition of CO₂. Encouragingly, the highest conversion of 13.1% was obtained at an applied voltage of 18 kV, which was a substantial increase of 39.4% compared to the traditional device. Compared with other types of dielectric barrier discharge plasma reactors, the proposed segmented outer electrode micro-plasma reactor can give a higher CO₂ conversion and acceptable energy efficiency. The increase in conversion can be attributed mainly to the enhanced corona discharge caused by the fringe effect at electrode edges, the increase in energy density and the increase in the number of micro-discharges. In addition, detailed electrical characterization was performed to reveal some trends in the electrical behavior of proposed reactors.

Keywords CO₂ decomposition dielectric barrier discharge segmented outer electrodes electrical analysis reactor design

Corresponding Author(s): Baowei Wang

Just Accepted Date: 29 September 2020 Online First Date: 26 November 2020 Issue Date: 10 May 2021

Cite this article:

Baowei Wang,Xiaoxi Wang,Bo Zhang. Dielectric barrier micro-plasma reactor with segmented outer electrode for decomposition of pure CO₂[J]. Front. Chem. Sci. Eng., 2021, 15(3): 687-697.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-020-1974-1
https://academic.hep.com.cn/fcse/EN/Y2021/V15/I3/687

Fig.1 Schematic diagram of the experimental system.

Fig.2 DBD micro-plasma reactors.

Tab.1 Electrode configuration parameters

Fig.3 (a) Typical DBD equivalent circuit; (b) Schematic of an idealized DBD Q-V plot.

Fig.4 Influence of the segmented electrode on discharge waveforms: (a) applied voltage: 18 kV; (b) input power: 60 W (frequency: 9.0 kHz; discharge length: 60.0 mm; barrier thickness: 1.6 mm; interval between adjacent outer electrodes: 10.0 mm; feed flow rate: 43.7 mL/min; residence time: 1.5 s).

Fig.5 Influence of segmented outer electrodes on C_d: (a) applied voltage; (b) input power.

Fig.6 Influence of segmented outer electrodes on C_g: (a) applied voltage; (b) input power.

Fig.7 Lissajous-figure of pure CO₂ decomposition at different DBD reactors: (a) applied voltage: 18 kV; (b) input power: 60 W.

Tab.2 The carbon balance of different reactors

Fig.8 CO yield of different reactors: (a) applied voltage; (b) input power.

Fig.9 CO₂ conversion of different reactors: (a) applied voltage; (b) input power.

Fig.10 Energy efficiency of different reactors: (a) applied voltage; (b) input power.

Tab.3 Comparison of CO₂ conversion and energy efficiency with different electrode configurations

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