Direct decomposition of CO₂ using self‐cooling dielectric barrier discharge plasma

Abstract

As a greenhouse gas, carbon dioxide (CO2) is one of the major causes of global warming. The effective control of CO2 emission has become a major global concern. To reduce CO2 emission in the environment and to maximize the use of CO2, a self‐cooling wire‐cylinder dielectric barrier discharge (DBD) plasma reactor was used to decompose CO2 at ambient conditions, and the results were compared with a common wire‐cylinder DBD reactor. Results indicated that in the said plasma reactor, circulating water could obviously improve discharge efficiency through taking away heat that was generated during plasma discharge process, and a more stable and homogeneous discharge was easier to obtain. The CO2 decomposition rate was 26.1% without using any catalysts and discharge mediums or modifying electrodes, and this value was significantly higher than that in the common wire‐cylinder DBD reactor (10.1% CO2 decomposition rate). Moreover, the CO2 decomposition rate could reach up to 35.8% when N2 was added (volume ratio VN2:VCnormalO2=9:1). © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

A Facile Method for Preparing UiO-66 Encapsulated Ru Catalyst and its Application in Plasma-Assisted CO2 Methanation

“…The CO 2 methanation has great prospects in economic and environmental applications since most of the fuel resources and one-carbon molecules (C1) can be regenerated from CO 2 [27,28]. The emerging plasma-assisted activation of CO 2 for methanation can provide the high energy for CO 2 decomposition and overcome the relatively harsh conditions and reaction devices required for conventional thermochemical conversion [29,30,31,32,33]. Ru-based catalysts, due to their efficient activity, have been applied in CO 2 methanation extensively.…”

DBD Plasma-ZrO2 Catalytic Decomposition of CO2 at Low Temperatures

“…Fifty two-point-one percent (1-mm ZrO 2 ) of the CO 2 decomposition rate was an accurate value, which has been repeatedly verified. Figure 8 shows the schematic diagram of the experimental setup, which is basically consistent with the previous apparatus in Zhou et al [37]. It contains 3 parts: a DBD plasma reactor, a flow control device and a GC detection and analysis system.…”

“…Firstly, increasing the discharge length from 100-200 mm significantly increased the residence time of CO 2 gas in the reactor, which positively increased the probability of CO 2 molecules colliding with highly energetic electrons and reactive species [34]. However, a longer discharge region will need increasing surface area of the DBD reactor, leading to higher energy loss due to heat dissipation [37], as shown in Figure 1b. In this study, increasing the discharge length significantly increased the residence time of CO 2 in the reaction, which plays a more dominant role in the decomposition of CO 2 compared to the negative effects (e.g., increased energy loss); therefore, 200 mm was chosen as the optimum discharge length to conduct the experiment.…”

“…Table 1 shows the compared values of the CO 2 decomposition and energy efficiency using different packed DBD reactors. Though the DBD reactor made of quartz has been widely applied for CO 2 decomposition, the self-cooling DBD reactor made of Pyrex glass can also be utilized for CO 2 decomposition [37]. A relatively higher CO 2 decomposition rate, together with a stable CO selectivity, was obtained when using the same packing materials like ZrO 2 pellets.…”

“…It has been proven that decreasing the temperature of the reactor was advantageous to CO 2 decomposition [43,44]. In this work, we controlled the temperature of the condensed water at 20 • C, while this value was optimized in Zhou et al [37]. The flow rate of pure CO 2 was fixed at 20 mL/min.…”