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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Efficiency, products and mechanisms of ethyl acetate oxidative degradation in air non-thermal plasma
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Efficiency, products and mechanisms of ethyl acetate oxidative degradation in air non-thermal plasma

机译：空气非热等离子体中乙酸乙酯氧化降解的效率，产品和机制

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Ethyl acetate (EA) is a popular solvent and diluent in many products and one of the most ubiquitous organic pollutants of indoor air. Although EA's ascertained toxicity is classified as low, exposure to its vapors at concentrations >= 400ppm causes serious problems in humans. EA is thus a frequent target in testing novel technologies for air purification. We report here an investigation of EA oxidative degradation in air at room temperature and atmospheric pressure induced by corona discharges. Three corona regimes, dc-, dc+ and pulsed +, were tested in the same reactor under various experimental conditions with regard to EA initial concentration (C-0) and the presence of humidity in the system. The EA degradation process was monitored by gas chromatography (GC)-flame ionization detection, GC-mass spectrometry and Fourier transform infrared spectroscopy analysis of the treated gas. These analyses yielded the concentration of residual EA (C) and those of its major products of oxidation (CO2, CO) and revealed a few organic reaction intermediates formed along the oxidation chain. The process energy efficiency was determined as energy constant, k(E) (kJ(-1) 1) and as energy yield, EY (g kW(-1) h(-1)). The efficiency depends on the type of corona (pulsed >dc- >dc+), on the presence of humidity in the air (improvement in the case of dc-, little or no effect for de+) and on C-0 (k(E) increases linearly with 1/C-0). CO2 and CO were the major carbon containing products, confirming the strong oxidizing power of air non-thermal plasma. Acetic acid and acetaldehyde were detected in very small amounts as reaction intermediates. The experimental results obtained in this work support the conclusion that different reactive species are involved in the initial step of EA oxidation in the case of dc- and dc+ corona air non-thermal plasma.
机译：乙酸乙酯（EA）是许多产品中普遍的溶剂和稀释剂，以及室内空气中最无处不在的有机污染物之一。虽然EA的确定毒性被归类为低，但在浓度下暴露于其蒸气> = 400ppm导致人类的严重问题。因此，EA是测试用于空气净化的新技术的频繁目标。我们在此报告在室温和电晕放电诱导的室温和大气压下的空气中EA氧化降解的研究。在关于EA初始浓度（C-0）的各种实验条件下，在相同的实验条件下在相同的反应器中测试三个电晕制度，DC-，DC +和脉冲+。系统中的湿度存在湿度。通过气相色谱（GC） - 氟离子化检测，GC质谱和傅立叶变换红外光谱分析进行处理的EA降解过程。这些分析产生了残留的EA（c）的浓度和其主要产物的氧化（CO2，CO）并揭示了沿氧化链形成的一些有机反应中间体。该过程能量效率被确定为能量常数，K（e）（kj（-1）1）和作为能量产率，Ey（g kw（-1）h（-1））。效率取决于电晕（脉冲> DC-> DC +）的类型，在空气中存在湿度（在DC的情况下改善，对DE +的DC效果几乎没有效果）和C-0（k（e ）用1 / C-0线性地增加。 CO2和CO是含有主要碳的产品，确认空气非热等离子体的强氧化力。以非常少量的量检测乙酸和乙醛作为反应中间体。在该工作中获得的实验结果支持的结论是，在DC和DC +电晕空气非热等离子体的情况下，不同的反应性物种参与EA氧化的初始步骤。

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