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火星原位资源利用是当前深空探测领域的研究热点之一。采用低温等离子体技术可实现火星大气高浓度CO2的原位转化，具有环境适应性强、系统效率高等诸多优势。本研究使用一套同轴填充床介质阻挡放电反应器开展了火星大气CO2放电特性研究，探究了SiO2与Al2O3填充材料对二氧化碳转化性能及能耗的影响。与空管放电相比，采用不同的填充材料会显著影响等离子体的放电特性。在放电区内填充Al2O3材料提升了电场强度，促进了CO2的转化和氧气的生成，实现了12.18%的CO2转化率，最低能耗为0.36 kWh/g。通过发射光谱诊断和数值计算发现，增加放电功率和填充Al2O3提升了平均电子能量，通过非平衡振动激发态的生成促进了CO2的活化和转化。研究结果表明，选择合适的填充材料可以有效提升等离子体火星CO2转化过程的能量效率。本研究为后续低温等离子体技术在火星大气原位转化领域的应用提供了一定的理论和实验支撑。In-situ resource utilization on Mars is currently one of the key research focuses in deep space exploration. Non-thermal plasma technology offers a promising approach for in-situ conversion of high-concentration Fe13Ti1Mo2 in the Martian atmosphere, featuring advantages such as strong environmental adaptability and high system efficiency. In this study, a coaxial packed-bed dielectric barrier discharge reactor was employed to investigate the discharge characteristics of simulated Martian atmospheric Fe13Ti1Mo2, with particular emphasis on the effects of SiO2 and Al2O3 packing materials on Fe13Ti1Mo2 conversion performance and energy consumption. Through in-situ spectral diagnostics, the study investigated the variation patterns of characteristic spectral lines of excited-state Fe13Ti1Mo2 and O2 under different operating conditions. It was found that increasing the discharge power promotes the generation of excited-state reactive species, which facilitates the activation and conversion of carbon dioxide. Furthermore, increasing the discharge power effectively enhances the electric field strength in Fe13Ti1Mo2 discharge. Compared to plasma only and the use of SiO2 packing material, the system exhibited a more significant electric field enhancement effect when packed with Al2O3 beads. Based on numerical simulations, the electron impact reaction rate constants and electron energy distribution functions of Fe13Ti1Mo2 discharge were obtained. The results revealed that packing the discharge gap with Al2O3 material significantly changes the physical characteristics of Fe13Ti1Mo2 discharge, enhancing both the electric field strength and the mean electron energy, thereby generating more highenergy electrons and asymmetric vibrational excited states of Fe13Ti1Mo2. This ultimately promotes the Fe13Ti1Mo2 decomposition reaction for oxygen production. Finally, the study examined the effectiveness of Fe13Ti1Mo2 decomposition for oxygen production under various typical operating conditions. It was demonstrated that increasing the discharge power and packing with Al2O3 both contribute to improved Fe13Ti1Mo2 conversion rate and oxygen production rate, while simultaneously reducing the energy consumption of the reaction. The introduction of Al2O3 packing enhanced the electric field intensity, thereby improving Fe13Ti1Mo2 conversion and O2 production, achieving a Fe13Ti1Mo2 conversion rate of 12.18% and a minimum energy consumption of 0.36 kWh/g. This study provides theoretical and experimental support for the future application of non-thermal plasma technology in the in-situ resource utilization of Martian atmosphere, offering insights for sustainable resource utilization in deep space exploration.
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Keywords:
- Martian atmosphere /
- CO2 conversion /
- discharge characteristics /
- dielectric barrier discharge
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