Plasma synthesis of ammonia is a potential and sustainable way of nitrogen fixation. In this work, a series of M/Al₂O₃ (M =Co, Ni, Co–Ni) catalysts have been investigated to enhance the synthesis of NH₃ from N₂ and H₂ in a dielectric barrier discharge (DBD) plasma reactor. Under the conditions of a volume ratio of N₂:H₂ of 1:1, a total gas flow rate of 200 mL min⁻¹, and a discharge temperature of 200 °C, the order of the ammonia synthesis rate filled with different catalysts was Co–Ni/Al₂O₃ > Co/Al₂O₃ > Ni/Al₂O₃ > Al₂O₃ > only plasma. And the highest ammonia synthesis rate could be obtained was 1500 μmol g⁻¹ h⁻¹ by using Co–Ni/Al₂O₃ as the catalyst. Further research found that compared with single metal catalysis, on the one hand, the presence of Co–Ni bimetal reduced the total amount and strength of acidic sites on the catalyst surface, which is beneficial for the desorption of synthesized ammonia gas. On the other hand, the presence of Co–Ni bimetal enhanced the plasma discharge observed by the ICCD camera. At the same time, the electrical characterization was found changed with different catalysts added in the plasma synthesis process. Adding a Co–Ni bimetal loaded catalyst in the reaction system increased the average electric field (E) and improved the power efficiency.

氨的等离子体合成是一种潜在且可持续的固氮方式。在这项工作中，研究了一系列 M/Al ₂ O ₃ (M =Co, Ni, Co-Ni) 催化剂，以增强在介质阻挡放电 (DBD) 等离子体中由 N ₂和 H ₂合成 NH ₃反应堆。在N ₂ :H ₂体积比为1:1、总气体流量为200 mL min ^-1、排气温度为200 ℃的条件下，不同催化剂填充的氨合成速率顺序为 Co-Ni/Al ₂ O ₃  > Co/Al ₂ O ₃  > Ni/Al ₂O ₃  > Al ₂ O ₃  > 仅等离子体。使用Co-Ni/Al ₂ O ₃可获得最高的氨合成速率为1500 μmol g ^-1  h ^-1作为催化剂。进一步研究发现，与单金属催化相比，一方面，Co-Ni双金属的存在降低了催化剂表面酸性位点的总量和强度，有利于合成氨气的解吸。另一方面，Co-Ni 双金属的存在增强了 ICCD 相机观察到的等离子体放电。同时，发现在等离子体合成过程中加入不同的催化剂会改变电学特性。在反应系统中添加负载 Co-Ni 双金属的催化剂增加了平均电场 (E) 并提高了功率效率。