Nitrogen fixation and H202H2O2 ${{\rm{H}}}_{2}{{\rm{O}}}_{2}$ production by an atmospheric pressure plasma jet operated in He–H20–N2–O2 gas mixtures

IF 2.9 3区 物理与天体物理 Q2 PHYSICS, APPLIED Plasma Processes and Polymers Pub Date : 2024-05-02 DOI:10.1002/ppap.202300233
Steffen Schüttler, Jannis Kaufmann, Judith Golda
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Abstract

Atmospheric pressure plasmas are widely used for nitrogen fixation processes to produce ammonia NH3 or nitrogen oxides NOx, including, for example, nitrite NO2− or nitrate NO3−. Small‐scale atmospheric pressure plasma jets (APPJs) can provide the production of these species on demand at the site of consumption. The species of interest are generated by the plasma and can be dissolved in liquids, for example, to use them. In this work, liquid treatments were performed by an APPJ operated in a He––– gas composition to investigate the influence of the gas composition on the production of hydrogen peroxide , and . A validation of two diagnostics showed that the spectrophotometric approach using ammonium metavanadate was interfered by other species when was added to the system. Thus, electrochemical sensing of was performed. The concentrations of and were measured by commercially available test kits based on the o‐phythalaldehyde method and the Griess reagent, respectively. At low admixtures, the dominant species was with a maximum concentration of 0.9 mM, while became dominant at admixtures of 0.5% and higher with concentrations of up to 1.5 mM. was also present in the system and could be measured at low concentrations of less than 0.2 mM in the liquid. By varying the treatment distance and the gas flow rate, insights into the transport phenomena of the species and their dissolution into the liquid could be gained. Low‐frequency pulsing of the radio frequency (RF) jet led to an accumulating effect on , a reduced production of and a switch from ‐dominated production to ‐dominated production.
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在 He-H20-N2-O2 气体混合物中运行的常压等离子体射流的固氮作用和 H202H2O2 ${\{rm{H}}}_{2}{{\{rm{O}}}_{2}$ 生产过程
常压等离子体被广泛用于固氮过程,以产生氨 NH3 或氮氧化物 NOx,包括亚硝酸盐 NO2- 或硝酸盐 NO3-。小型常压等离子体喷射器(APPJ)可以在消费地点按需生产这些物质。等离子体产生的相关物质可以溶解在液体中使用。在这项工作中,在 He-- 气体成分中运行的 APPJ 对液体进行了处理,以研究气体成分对过氧化氢、和的产生的影响。对两种诊断方法的验证表明,使用偏钒酸铵的分光光度法在系统中加入其他物质时会受到干扰。因此,采用了电化学传感法。市售的检测试剂盒分别根据邻苯二甲醛法和格里斯试剂法测定了和的浓度。在低浓度混合物中,主要物质的最大浓度为 0.9 毫摩尔,而在浓度为 0.5%或更高的混合物中,主要物质的浓度可达 1.5 毫摩尔。通过改变处理距离和气体流速,可以深入了解物种的迁移现象及其在液体中的溶解情况。射频(RF)射流的低频脉冲导致了累积效应,减少了"-"的产生,并从"-"为主的产生转变为"-"为主的产生。
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来源期刊
Plasma Processes and Polymers
Plasma Processes and Polymers 物理-高分子科学
CiteScore
6.60
自引率
11.40%
发文量
150
审稿时长
3 months
期刊介绍: Plasma Processes & Polymers focuses on the interdisciplinary field of low temperature plasma science, covering both experimental and theoretical aspects of fundamental and applied research in materials science, physics, chemistry and engineering in the area of plasma sources and plasma-based treatments.
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