Sustainable plasma-catalytic NH₃ synthesis is receiving an increasing amount of interest as a greener alternative for the conventional Haber-Bosch (HB) process. However, the best energy efficiency for the plasma synthesis reported so far is still low compared to the one of HB. This research was conducted to experimentally investigate one of the plasma process rate-limiting steps, which is N₂ bond breaking. This study aimed at identifying the enhancing-surface reactions as well as limiting surface reactions such as H-inhibition. Ru/CeO₂ and Ru/Ti-CeO₂ were tested in a packed-bed DBD reactor to investigate the influence of TiO₂ addition, which possibly prevented H-inhibition, and simultaneously enhanced different surface reactions. Variations of feed gas ratios and designed operation schemes were studied to elucidate the effect of the catalyst composition. Results showed that Ru/Ti-CeO₂ outperformed Ru/CeO₂ in terms of energy consumption and a N₂-rich atmosphere was needed to obtain minima of 84.5 MJ mol⁻¹ and 126.5 MJ mol⁻¹, respectively. The addition of TiO₂ in the catalysts provided more surface sites for H₂ to adsorb on, which was identified as main reason for improving the energy efficiency of the plasma-catalytic NH₃ synthesis. Three detailed reaction mechanisms were proposed to elaborate on the behavior between N₂-rich plasma and Ru/Ti-CeO₂.

作为传统 Haber-Bosch (HB) 工艺的更环保替代品，可持续的等离子体催化 NH ₃合成正受到越来越多的关注。然而，迄今为止报道的等离子体合成的最佳能量效率与 HB 相比仍然较低。进行这项研究是为了通过实验研究等离子体工艺限速步骤之一，即 N ₂键断裂。本研究旨在确定增强表面反应以及限制表面反应，例如 H 抑制。在填充床 DBD 反应器中测试Ru/CeO ₂和 Ru/Ti-CeO ₂以研究 TiO _2的影响此外，这可能阻止了 H 抑制，同时增强了不同的表面反应。研究了进料气体比例和设计的操作方案的变化，以阐明催化剂组成的影响。结果表明，Ru/Ti-CeO ₂在能耗方面优于 Ru/CeO _{2 ，​​需要富含 N 2}的气氛才能分别获得 84.5 MJ mol ^-1和 126.5 MJ mol ^-1的最小值。在催化剂中添加 TiO _{2为 H 2吸附提供了更多的表面位点，这被认为是提高等离子体催化 NH 3}合成的能量效率的主要原因。 提出了三种详细的反应机制来详细说明富含 N ₂的等离子体与 Ru/Ti-CeO ₂之间的行为。