In this work, strontium tantalate (Sr₂Ta₂O₇) nanowires were used for the first time as a support of ruthenium catalysts for ammonia synthesis. The highest ammonia synthesis activity of 1582 μmol g⁻¹_cat h⁻¹ was observed with Ru/Sr₂Ta₂O₇ catalysts prepared with molar ratio of Sr(OH)₂/Ta₂O₅ at 4. After loading promoters, the ammonia synthesis activity was significantly improved to 4856, 5004 and 5038 μmol g⁻¹_cat h⁻¹ for K-, Rb- and Cs- modified Ru/Sr₂Ta₂O₇ catalysts. Characterization and kinetic experiments indicate that the improved ammonia synthesis rate of promoters-Ru/Sr₂Ta₂O₇ catalysts was attributable to the combined effect of alleviated hydrogen poisoning through the promotion of hydrogen spillover from Ru species to support of Sr₂Ta₂O₇ and enhanced activation of N₂ due to increased electron density of Ru sites because of electron donation from introduced oxygen vacancies and promoters. The study not only clarifies the role of promoters in ammonia synthesis, but also provides an excellent Ru catalyst on Sr₂Ta₂O₇ nanowires for ammonia synthesis.

在这项工作中，钽酸锶（Sr ₂ Ta ₂ O ₇）纳米线首次用作氨合成钌催化剂的载体。在以4的Sr（OH）₂ / Ta ₂ O ₅摩尔比制备的Ru / Sr ₂ Ta ₂ O ₇催化剂中，观察到最高的氨合成活性为1582μmolg ^-1 _cat h ^-1。 K，Rb和Cs修饰的Ru / Sr ₂ Ta的氨合成活性显着提高到4856、5004和5038μmolg ^-1 _cat h ^-1₂ O ₇催化剂。表征和动力学实验表明，助催化剂-Ru / Sr ₂ Ta ₂ O ₇催化剂合成氨的速率提高，归因于通过促进氢从Ru物种向Sr ₂ Ta ₂ O的支持扩散而减轻的氢气中毒。_在图7中，由于引入的氧空位和促进剂给电子，Ru位的电子密度增加，N _2的活化增强。该研究不仅阐明了促进剂在氨合成中的作用，而且为Sr ₂ Ta ₂提供了优良的Ru催化剂。用于氨合成的O ₇纳米线。