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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Non-equilibrium excitation of CO2 in an atmospheric pressure helium plasma jet
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Non-equilibrium excitation of CO2 in an atmospheric pressure helium plasma jet

机译：大气压氦等离子体射流中的CO2的非平衡激发

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摘要

The energy efficient excitation of CO2 in atmospheric pressure plasmas may be a method to generate solar fuels from renewable energies. This energy efficiency can be very high, if only specific states of the molecules in the plasma are populated creating a strong non-equilibrium. This requires a specific design of the plasma source, method of plasma excitation and choice of gases and admixtures. In this paper, non-equilibrium excitation and dissociation of CO2 in an atmospheric pressure helium RF plasma jet is analysed for varying absorbed plasma power and admixture levels of CO2. The concentrations of CO2 and of CO, as well as the vibrational and rotational temperatures of the possible degrees of freedom of the molecules are evaluated by Fourier transform infrared spectroscopy (FTIR). The molecular rotational vibrational spectra are modelled based on Maxwell-Boltzmann state populations using individual temperatures for each degree of freedom. A strong non-equilibrium excitation of CO2 and CO has been found. Whereas the rotational temperatures are 400 K or below, the vibrational temperature for CO reaches values up to 1600 K and that of the asymmetric vibration of CO2 of 700 K. The dependence of these excitation temperatures on plasma power and admixture level is rather weak. The mass balance, the energy and conversion efficiency are consistent with a very simple chemistry model that is dominated by CO2 dissociation via Penning collisions with helium metastables. A conversion efficiency up to 30% and an energy efficiency up to 10% is observed in the parameter range of the experiment.
机译：大气压等离子体中CO2的节能激发可以是从可再生能量产生太阳能燃料的方法。如果只有血浆中分子的特定状态，这种能量效率可以很高，填充强烈的非平衡。这需要等离子体源的特定设计，等离子体激发方法和气体和混合的选择。本文分析了大气压氦RF等离子体射流中的非平衡激发和CO 2的解离，以改变吸收的等离子体功率和CO 2的混合物水平。 CO 2和CO的浓度以及分子可能自由度的可能自由度的振动和旋转温度由傅立叶变换红外光谱（FTIR）评估。分子旋转振动光谱是基于Maxwell-Boltzmann状态群体的建模，使用各种自由度的各个温度。发现了CO2和CO的强烈非平衡激发。虽然旋转温度为400 k或更低，但CO的振动温度达到高达1600 k的值，并且CO2的不对称振动为700k。这些激发温度对等离子体功率和混合物水平的依赖性相当弱。质量平衡，能量和转换效率是一致的，这与一个非常简单的化学模型，其通过与氦衡量来的剪切碰撞为主。在实验的参数范围内，在实验的参数范围内观察到高达30％的转化效率和高达10％的能量效率。

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