Dielectric barrier micro-plasma reactor with segmented outer electrode for decomposition of pure CO 2
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RESEARCH ARTICLE
Dielectric barrier micro-plasma reactor with segmented outer electrode for decomposition of pure CO2 Baowei Wang (✉)1, 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
© Higher Education Press 2020
Abstract Four coaxial cylinder dielectric barrier discharge micro-plasma reactors were designed for the noncatalytic 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
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Introduction
The consumption of fossil fuels has brought unprecedented rapid development to human society. Meanwhile, it also leads to the continuous increase of greenhouse gas emissions, especially CO2, which accounts for a dominant Received April 13, 2020; accepted June 15, 2020 E-mail: [email protected]
proportion of greenhouse gases. These anthropogenic CO2 emissions have exceeded the natural carbon cycle and are identified as one of the major contributors to the greenhouse effect, which poses a serious threat to our current society and future generations. Currently, among available solutions, the carbon capture, utilization and storage (CCUS) technology, which is about to purify and convert CO2 captured from power plants into hydrocarbons to generate new economic benefits, offers the most feasible, practical and mature alternative for industrial-scale applications. Because the CCUS technology can fundamentally solve the problem of excessive CO2 emissions, it has attracted worldwide attention. Carbon monoxide (CO), as a common industrial feedstock, can be widely used for production of high valueadded chemicals and fuels, such as organic acids, esters and other chemicals. Thus, the direct decomposition of pure CO2 into CO
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