Non-thermal plasma (NTP) has developed into an emerging end-of-pipe technology for treating volatile organic compounds (VOCs) present in unhygienic point source of air streams. In this work, NTP oxidation of low-concentration ethyl acetate was performed in a coaxial double dielectric barrier discharge reactor. The effects of initial ethyl acetate concentration, gas flow rate, and external electrode length on ethyl acetate degradation were systematically investigated as a function of discharge power. In addition, detailed real-time and online proton transfer reaction mass spectrometry analysis was used to identify the transient species formation and transition in the various NTP oxidation periods of ethyl acetate. Based on the analysis of organic by-products, the degradation mechanism was speculated and the major reaction channels were presented. This study would deepen the understanding of plasma degradation of VOCs and reveal the plasma-chemical mechanism.

非热等离子体（NTP）已发展成为一种新兴的管道末端技术，用于处理空气流不卫生的点源中存在的挥发性有机化合物（VOC）。在这项工作中，在同轴双介电势垒放电反应器中进行了低浓度乙酸乙酯的NTP氧化。作为放电功率的函数，系统地研究了初始乙酸乙酯浓度，气体流速和外部电极长度对乙酸乙酯降解的影响。此外，使用详细的实时和在线质子转移反应质谱分析来确定乙酸乙酯在各个NTP氧化期间的瞬时物种形成和过渡。在分析有机副产物的基础上，推测了其降解机理，并提出了主要的反应途径。