Cobalt-nickel-based catalysts are among the most promising non-noble metal catalysts for hydrogen production via ammonia decomposition. However, attaining the optimal bonding ratio at the CoNi alloy-support interface remains a significant challenge for ensuring sufficient catalytic activity in ammonia decomposition. To address this issue, this study investigates the enhancement of catalytic activity through the interface effects between CoNi alloy nanoparticles and different supports (ZSM-5, Al2O3, and TiO2), as well as the role of Lewis acid sites within the supports. It is found that the CoNi alloy particles supported on the carriers form CoNi-O bonds with oxygen atoms, creating an oxide-metal interface that facilitates charge transfer from the carrier to the alloy, promoting catalytic activity. In the CoNi/ZSM-5 catalyst, the abundant formation of CoNi-O bonds enhances the interfacial effects and promotes charge transfer, thereby improving catalytic performance. Besides, the plentiful Lewis acid sites in ZSM-5 improve the ammonia adsorption and the increasing local ammonia concentration ensures more effective contact and enhances catalytic efficiency.

中文翻译：

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通过优化负载型钴镍合金催化剂中的界面效应和酸性位点来增强氨分解以生产氢气


钴镍基催化剂是最有前途的非贵金属催化剂之一，用于通过氨分解制氢。然而，在 CoNi 合金-负载体界面处获得最佳键合比仍然是确保氨分解中足够催化活性的重大挑战。为了解决这个问题，本研究研究了 CoNi 合金纳米颗粒与不同载体（ZSM-5、Al2O3 和 TiO2）之间的界面效应增强催化活性，以及路易斯酸位点在载体中的作用。研究发现，载体上支撑的 CoNi 合金颗粒与氧原子形成 CoNi-O 键，形成氧化物-金属界面，促进电荷从载流子转移到合金，促进催化活性。在 CoNi/ZSM-5 催化剂中，CoNi-O 键的大量形成增强了界面效应并促进了电荷转移，从而提高了催化性能。此外，ZSM-5 中丰富的路易斯酸位点提高了氨的吸附性，而不断增加的局部氨浓度确保了更有效的接触并提高了催化效率。