Dry reforming of CH₄ process can convert greenhouse gases into high-value-added fuels and chemicals with its broad application prospects in environmental protection and renewable energy. Non-thermal plasma is considered an effective alternative method because it can activate CH₄ and CO₂ under low temperature and atmospheric pressure. This paper is aimed to optimize the plasma-assisted dry reforming of CH₄ process in a unipolar microsecond pulsed coaxial dielectric barrier discharge by investigating the effects of reactor structures. The results show that the conversions of reactants and the yields of syngas were significantly affected by the reactor structures. Specifically, a multi-stage or foil external electrode and negative polar discharge could promote CH₄ and CO₂ conversions, gas product yields, and energy conversion efficiencies. For different electrodes, the maximal conversions of CH₄ and CO₂ were 20.4% and 14.1%, with an energy conversion efficiency of 4.4% under our experimental conditions. Higher conversions, yields, and energy conversion efficiencies were obtained with lower power input when applying heat insulation measures. CH₄ conversion was promoted to 27.9% with a moderate energy conversion efficiency of 3.8%, but the conversion of CO₂ was only 12% when packing materials into the reactor. The results can provide specific guidance for designing plasma or plasma-catalytic dry reforming reactor.

中文翻译：

---

微秒脉冲介质阻挡放电等离子体干重整甲烷：优化反应器结构

_{CH 4}工艺的干重整可以将温室气体转化为高附加值的燃料和化学品，在环保和可再生能源方面具有广阔的应用前景。非热等离子体被认为是一种有效的替代方法，因为它可以在低温和大气压下激活CH ₄和CO _{2 。}本文旨在优化CH _{4的等离子辅助干法重整}通过研究反应器结构的影响，在单极微秒脉冲同轴介质阻挡放电中进行处理。结果表明，反应器结构对反应物转化率和合成气产率有显着影响。具体而言，多级或箔外部电极和负极性放电可以促进 CH ₄和 CO ₂转化、气体产品产率和能量转化效率。对于不同的电极，CH ₄和CO _{2的最大转化率}在我们的实验条件下，分别为 20.4% 和 14.1%，能量转换效率为 4.4%。在应用隔热措施时，以较低的功率输入获得了更高的转化率、产量和能量转化效率。CH ₄转化率提升至27.9%，能量转化率适中，为3.8%，但将物料装入反应器时CO ₂转化率仅为12%。研究结果可为设计等离子体或等离子体催化干重整反应器提供具体指导。