Optical analysis during reduction of nitric oxide in microwave-induced plasma promoted by activated cokes at atmospheric pressure
Optical analysis during reduction of nitric oxide in microwave-induced plasma promoted by activated cokes at atmospheric pressure
复制标题
DOI：
10.1016/j.fuel.2018.12.133
复制
发表时间：
2019-04
期刊：
影响因子：
7.4
通讯作者：
Y. Itaya;K. Matsubara;Ryo Tanaka;Nobusuke Kobayashi
中科院分区：
文献类型：
--
作者：
Y. Itaya;K. Matsubara;Ryo Tanaka;Nobusuke Kobayashi
采用光谱法研究了常压下活性焦颗粒床促进的微波诱导氩等离子体在非催化还原一氧化氮过程中的辐射。高分辨率光谱分析表明，当Ar等离子体中含有NO分子时，在与N2+第一负带相似的波长区域内识别出5个强峰。最强峰是由Ar（II）离子在3s 23 p4（3 P）4d 4D ° 1/2→ 3s 23 p4（3 P）4p 4D °1/2跃迁过程中激发的能量为388.033 nm的能量引起的。这种过渡必须通过与NO还原反应过程中产生的任何中间体或自由基物种的相互作用来增强。等离子体温度由光谱带中任意两个峰的强度通过玻尔兹曼图确定。两个峰的选择对温度的影响很大，这意味着非平衡等离子体。由于反应过程中的活化，最高温度在40，000 K的高水平下被识别。高速摄影观察到的等离子体图像具有动态特征，反应器中经常出现类似流光的微波放电。反应速率与反应器中动态等离子体占主导的面积与截面积之比有关。
Emission from microwave (MW)-induced argon plasma promoted by a bed of activated coke granules was analyzed spectroscopically during non-catalytic reduction of nitric oxide (NO) at atmospheric pressure. The spectral analysis with a high resolution revealed that strong 5 peaks were recognized in a similar wavelength region to N2+first negative band when NO molecules were included in argon plasma. The strongest peak is caused by the Ar(II) ions excited with energy corresponding to 388.033 nm in the progress of atomic transition 3s23p4(3P)4d4D1/2→ 3s23p4(3P)4p4D°1/2. This transition must be enhanced by an interaction with any intermediates or radical species yielded during NO reduction reactions. The plasma temperatures were determined by Boltzmann plots from intensities of any two peaks in the spectral band. The temperature was significantly different dependently on choice of two peaks, whose fact is implying non-equilibrium plasma. The maximum temperature was recognized at a high level of 40,000 K due to the activation during the reactions. The images of the plasma observed by high-speed camera showed dynamic features so that MW discharge like streamer was generated frequently in the reactor. The reaction rate could be correlated with the ratio of the area dominated by dynamic plasma to the cross section in the reactor.