CO2 and CH4 conversion in “real” gas mixtures in a gliding arc plasmatron: how do N2 and O2 affect the performance?,Green Chemistry

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CO2 and CH4 conversion in “real” gas mixtures in a gliding arc plasmatron: how do N2 and O2 affect the performance?
Green Chemistry ( IF 9.3 ) Pub Date : 2020/01/30 , DOI: 10.1039/c9gc03743h
Joachim Slaets _{1,

2,

3,

4,

5} , Maryam Aghaei _{1,

2,

3,

4,

5} , Sara Ceulemans _{1,

2,

3,

4,

5} , Senne Van Alphen _{1,

2,

3,

4,

5} , Annemie Bogaerts _{1,

2,

3,

4,

5}

Affiliation

In this paper we study dry reforming of methane (DRM) in a gliding arc plasmatron (GAP) in the presence of N₂ and O₂. N₂ is added to create a stable plasma at equal fractions of CO₂ and CH₄, and because emissions from industrial plants typically contain N₂, while O₂ is added to enhance the process. We test different gas mixing ratios to evaluate the conversion and energy cost. We obtain conversions between 31 and 52% for CO₂ and between 55 and 99% for CH₄, with total energy costs between 3.4 and 5.0 eV per molecule, depending on the gas mixture. This is very competitive when benchmarked with the literature. In addition, we present a chemical kinetics model to obtain deeper insight in the underlying plasma chemistry. This allows determination of the major reaction pathways to convert CO₂ and CH₄, in the presence of O₂ and N₂, into CO and H₂. We show that N₂ assists in the CO₂ conversion, but part of the applied energy is also wasted in N₂ excitation. Adding O₂ enhances the CH₄ conversion, and lowers the energy cost, while the CO₂ conversion remains constant, and only slightly drops at the highest O₂ fractions studied, when CH₄ is fully oxidized into CO₂.

中文翻译：

滑弧等离子加速器中“真实”气体混合物中的CO2和CH4转化：N2和O2如何影响性能？

在本文中，我们研究了在存在N ₂和O ₂的情况下，在滑弧等离子加速器（GAP）中对甲烷（DRM）进行干法重整。添加N ₂以在等比例的CO ₂和CH ₄处产生稳定的等离子体，并且由于来自工厂的排放物通常包含N ₂，而添加O ₂则可以增强该过程。我们测试了不同的气体混合比，以评估转化率和能源成本。我们获得的CO ₂转化率为31％至52 ％，CH _4的转化率为55％至99％，根据混合气体的不同，每个分子的总能量成本在3.4至5.0 eV之间。当以文献为基准时，这是非常有竞争力的。此外，我们提出了一种化学动力学模型，以便在潜在的等离子体化学中获得更深入的了解。这允许确定在O ₂和N ₂存在下将CO ₂和CH ₄转化为CO和H ₂的主要反应途径。我们表明，N ₂有助于CO ₂转化，但是在N ₂激发中也浪费了一部分施加的能量。添加O ₂可以提高CH _4的转化率，并降低能源成本，而CO当CH₄完全氧化为CO₂时，_2的转化率保持恒定，并且在研究的最高O₂分数下仅略有下降。

更新日期：2020-02-24

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