Nitrogen fixed into HNO₃ by pulsed high voltage discharge

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• 作者：Wenjuan Bian^a ; ^{bwenjuan@yahoo.com.cn} ; ^{bwenjuan@suda.edu.cn} ; Xuehong Song^b ; Junwen Shi^a ; Xiangli Yin^a
• 关键词：Pulsed high voltage discharge ; Bubbling ; Nitrogen fixation ; HNO3
• 刊名：Journal of Electrostatics
• 出版年：2012
• 期刊代码：49_03043886
• 类别：ce
• 出版时间：June, 2012
• 卷：70
• 期：3
• 页码：317-326
• 文件大小：841 K

摘要

By applying pulsed high voltage discharge to a needle-mesh reactor that using seven acupuncture needles as discharge electrode and stainless steel wire mesh as ground electrode, nitrogen from bubbling gas could be fixed into NO₂^{鈭?/sup> and NO₃鈭?/sup> with equivalent mol H+ produced in the liquid phase and a small amount of NO and NO₂ yielded in the gas phase. The HNO₂ was originally formed and then converted into HNO₃. The 路OH and H₂O₂ stimulated the conversion reaction from HNO₂ to HNO₃, which caused HNO₂ concentration increased in the first 12 min and then decreased until lower than its detection limit. The concentration of HNO₃ still increased with discharge time. After 36 min, HNO₃ was the only and ultimate product in the liquid. The total yield of HNO₂ and HNO₃ could be affected by processing parameters such as electric factors of peak voltage and frequency, mesh size of ground electrode and content of nitrogen in N₂/O₂ bubbling. Increasing peak voltage or frequency, the total yield of HNO₂ and HNO₃ increased. Gas composition had a heavy impact on the fixation efficiency that obtained its maximum value at an oxygen content of 66.7%with bubbling O₂/N₂ gas. At the end of the 36 min discharge, the HNO₃ concentration with bubbling air was 2.215 mmol L鈭? at an applied voltage of 25 kV, pulse repetition frequency of 140 Hz and ground electrode mesh of 20 脳 20. The energy yield was about 1.22 g (HNO₃)/kWh.}