State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
J Environ Sci (China). 2014 Nov 1;26(11):2249-56. doi: 10.1016/j.jes.2014.09.010. Epub 2014 Sep 29.
Non-thermal plasma technology has been regarded as a promising alternative technology for NOx removal. The understanding of NO2 reduction characteristics is extremely important since NO2 reduction could lower the total NO oxidation rate in the plasma atmosphere. In this study, NO2 reduction was experimentally investigated using a non-thermal plasma reactor driven by a pulsed power supply for different simulated gas compositions and operating parameters. The NO2 reduction was promoted by increasing the specific energy density (SED), and the highest conversion rates were 33.7%, 42.1% and 25.7% for Ar, N2/Ar and O2/Ar, respectively. For a given SED, the NO2 conversion rate had the order N2/Ar>Ar>O2/Ar. The highest energy yield of 3.31g/kWh was obtained in N2/Ar plasma and decreased with increasing SED; the same trends were also found in the other two gas compositions. The conversion rate decreased with increasing initial NO2 concentration. Furthermore, the presence of N2 or O2 led to different reaction pathways for NO2 conversion due to the formation of different dominating reactive radicals.
非热等离子体技术被认为是一种很有前途的 NOx 去除替代技术。由于 NO2 还原会降低等离子体气氛中的总 NO 氧化速率，因此了解 NO2 还原特性非常重要。在这项研究中，使用脉冲电源驱动的非热等离子体反应器对不同模拟气体组成和操作参数下的 NO2 还原进行了实验研究。通过增加比能密度（SED）促进了 NO2 还原，Ar、N2/Ar 和 O2/Ar 的最高转化率分别为 33.7%、42.1%和 25.7%。对于给定的 SED，NO2 转化率的顺序为 N2/Ar>Ar>O2/Ar。在 N2/Ar 等离子体中获得了 3.31g/kWh 的最高能量产率，并且随着 SED 的增加而降低；在其他两种气体组成中也发现了相同的趋势。转化率随着初始 NO2 浓度的增加而降低。此外，由于形成了不同的主导反应性自由基，N2 或 O2 的存在导致了 NO2 转化的不同反应途径。
