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首页> 外文期刊>Plasma Sources Science & Technology >DBD in burst mode: solution for more efficient CO2 conversion?
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DBD in burst mode: solution for more efficient CO2 conversion?

机译：DBD在突发模式下：用于更高效的二氧化碳转换解决方案？

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摘要

CO2 conversion into value-added products has gained significant interest over the few last years, as the greenhouse gas concentrations constantly increase due to anthropogenic activities. Here we report on experiments for CO2 conversion by means of a cold atmospheric plasma using a cylindrical flowing dielectric barrier discharge (DBD) reactor. A detailed comparison of this DBD ignited in a so-called burst mode (i.e. where an AC voltage is applied during a limited amount of time) and pure AC mode is carried out to evaluate their effect on the conversion of CO2 as well as on the energy efficiency. Decreasing the duty cycle in the burst mode from 100% (i.e. corresponding to pure AC mode) to 40% leads to a rise in the conversion from 16-26% and to a rise in the energy efficiency from 15 to 23%. Based on a detailed electrical analysis, we show that the conversion correlates with the features of the microfilaments. Moreover, the root-mean-square voltage in the burst mode remains constant as a function of the process time for the duty cycles 70%, while a higher duty cycle or the usual pure AC mode leads to a clear voltage decay by more than 500 V, over approximately 90 s, before reaching a steady state regime. The higher plasma voltage in the burst mode yields a higher electric field. This causes the increasing the electron energy, and therefore their involvement in the CO2 dissociation process, which is an additional explanation for the higher CO2 conversion and energy efficiency in the burst mode.
机译：在过去的几年里，随着人为活动导致温室气体浓度不断增加，将二氧化碳转化为增值产品引起了人们的极大兴趣。在这里，我们报告了利用圆柱形流动介质阻挡放电（DBD）反应器通过冷大气等离子体进行CO2转化的实验。对在所谓的突发模式（即在有限时间内施加交流电压）和纯交流模式下点燃的DBD进行详细比较，以评估其对CO2转化和能源效率的影响。将突发模式下的占空比从100%（即对应于纯交流模式）降低到40%将导致转换从16-26%上升，并将能源效率从15%上升到23%。基于详细的电学分析，我们发现转换与微丝的特征相关。此外，突发模式下的均方根电压作为占空比处理时间的函数保持不变；70%，而更高的占空比或通常的纯交流模式会导致在达到稳定状态之前，电压在大约90秒内明显衰减500 V以上。脉冲模式中较高的等离子体电压产生较高的电场。这导致电子能量增加，因此它们参与了CO2解离过程，这是脉冲模式下较高CO2转化率和能量效率的另一种解释。

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