Ammonia, which can serve as a hydrogen carrier for later dehydrogenation in zero-carbon hydrogen generation, is considered one of the key solutions. However, this solution is challenged by the high decomposition temperature and low reaction efficiency. In this paper, non-equilibrium plasma was used to effectively improve the reaction performance of ammonia decomposition to hydrogen and nitrogen using a dielectric barrier discharge reactor. Impacts of operating conditions including discharge parameters, diluted gases, and ammonia concentration on hydrogen generation were investigated. The ammonia decomposition breakdown voltage followed the order of 1 % ammonia/carbon dioxide (4000 V) > 1 % ammonia/nitrogen (3500 V) > 1 % ammonia/helium (1500 V) ≈ 1 % ammonia/argon (1500 V). The effect of pulse voltage and frequency is more significant on plasma-assisted ammonia decomposition compared to the pulse width. When the pulse frequency and width were 30 kHz and 100 ns at 298 K, the ammonia conversion reached 26.3 %, 34.1 % and 40.9 % at 5000, 7000, and 10000 V, respectively. With the addition of argon in 5 % ammonia/helium, the resulting penning effect makes the discharge easier and more uniform to promote ammonia decomposition. Furthermore, the kinetic analysis was investigated to better understand the conversion and utilization of ammonia in plasma-assisted reactions.

中文翻译：

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介质阻挡放电等离子体辅助氨分解制氢

氨可以作为后续零碳制氢脱氢的氢载体，被认为是关键解决方案之一。然而，该解决方案面临分解温度高和反应效率低的挑战。本文利用非平衡等离子体，利用介质阻挡放电反应器，有效提高了氨分解制氢和氮的反应性能。研究了包括放电参数、稀释气体和氨浓度在内的操作条件对氢气产生的影响。氨分解击穿电压的顺序为：1%氨/二氧化碳(4000V)>1%氨/氮(3500V)>1%氨/氦(1500V)≈1%氨/氩(1500V)。与脉冲宽度相比，脉冲电压和频率对等离子体辅助氨分解的影响更为显着。当脉冲频率和宽度为30 kHz和100 ns、298 K时，氨转化率在5000、7000和10000 V时分别达到26.3%、34.1%和40.9%。在5%氨/氦中添加氩气，产生的潘宁效应使放电更容易、更均匀，促进氨分解。此外，还研究了动力学分析，以更好地了解等离子体辅助反应中氨的转化和利用。