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首页> 外文期刊>Journal of Applied Physics >Detailed study of the plasma-activated catalytic generation of ammonia in N_2-H_2 plasmas
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Detailed study of the plasma-activated catalytic generation of ammonia in N_2-H_2 plasmas

机译：N_2-H_2等离子体中氨激活等离子体催化生成的详细研究

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摘要

We investigated the efficiency and formation mechanism of ammonia generation in recombining plasmas generated from mixtures of N_2 and H_2 under various plasma conditions. In contrast to the Haber-Bosch process, in which the molecules are dissociated on a catalytic surface, under these plasma conditions the precursor molecules, N_2 and H_2, are already dissociated in the gas phase. Surfaces are thus exposed to large fluxes of atomic N and H radicals. The ammonia production turns out to be strongly dependent on the fluxes of atomic N and H radicals to the surface. By optimizing the atomic N and H fluxes to the surface using an atomic nitrogen and hydrogen source ammonia can be formed efficiently, i.e., more than 10% of the total background pressure is measured to be ammonia. The results obtained show a strong similarity with results reported in literature, which were explained by the production of ammonia at the surface by stepwise addition reactions between adsorbed nitrogen and hydrogen containing radicals at the surface and incoming N and H containing radicals. Furthermore, our results indicate that the ammonia production is independent of wall material. The high fluxes of N and H radicals in our experiments result in a passivated surface, and the actual chemistry, leading to the formation of ammonia, takes place in an additional layer on top of this passivated surface.
机译：我们研究了在各种等离子体条件下，由N_2和H_2的混合物产生的等离子体重组中氨生成的效率和形成机理。与其中分子在催化表面上解离的哈伯-博世方法相反，在这些等离子体条件下，前体分子N_2和H_2已在气相中解离。因此，表面暴露于大量的原子N和H自由基通量。事实证明，氨的产生很大程度上取决于原子N和H自由基通向表面的通量。通过使用原子氮和氢优化到达表面的原子N和H通量，可以有效地形成氨，即测得总背景压力的10％以上是氨。所获得的结果与文献报道的结果具有很强的相似性，这可以通过表面吸附的氮和氢自由基与进入的N和H自由基之间逐步加成反应在表面产生氨来解释。此外，我们的结果表明氨的产生与壁材料无关。在我们的实验中，高通量的N和H自由基会形成钝化的表面，而导致氨形成的实际化学反应会在该钝化表面的顶部附加层中发生。

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