We report a new strategy for strengthening metal–support interaction and stabilizing Co nanoparticles at high temperature. Through the use of dopamine and removal of carbon layers by thermal N₂ treatment, ceria-based Co catalysts that are efficient and highly stable for ammonia synthesis can be obtained. The ammonia synthesis rate at 425 °C and 1 MPa is enhanced from 3.81 mmol_NH3 g_cat⁻¹ h⁻¹ over Co/CeO₂ to 19.12 mmol_NH3 g_cat⁻¹ h⁻¹ over a dopamine-mediated catalyst. The superior catalytic performances of the dopamine-mediated Co/CeO₂ catalyst are associated with smaller crystalline size, stronger metal–support interaction and lower N₂ activation energy.

中文翻译：

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多胺可促进钴基催化剂与金属的牢固金属相互作用，从而实现高效氨合成：原位XPS和XAFS光谱结合TPD研究†

我们报告了一种在高温下加强金属与载体相互作用并稳定Co纳米颗粒的新策略。通过使用多巴胺和通过热N ₂处理去除碳层，可以获得对于氨合成而言有效且高度稳定的基于二氧化铈的Co催化剂。在425℃和1MPa下，氨的合成速率在多巴胺介导的催化剂下从Co / CeO ₂上的3.81mmol _{NH 3} g _cat ^-1 h ^-1增加到19.12 mmol _{NH 3} g _cat ^-1 h ^-1。多巴胺介导的Co / CeO ₂的优异催化性能催化剂与较小的晶体尺寸，较强的金属-载体相互作用和较低的N ₂活化能有关。