Strong metal-support interaction promoted scalable production of thermally stable single-atom catalysts
Strong metal-support interaction promoted scalable production of thermally stable single-atom catalysts
复制标题
强金属-载体相互作用促进热稳定单原子催化剂的规模化生产
DOI：
10.1038/s41467-020-15410-w
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发表时间：
2020-03-09
影响因子：
16.6
通讯作者：
Zhang, Tao
中科院分区：
文献类型：
--
作者：
Liu, Kaipeng;Zhao, Xintian;Zhang, Tao
单原子催化剂在许多非均相反应中表现出上级的催化性能。然而，生产热稳定的SAC，特别是以简单和可扩展的方式，仍然是一个巨大的挑战。在这里，我们报告的钌SAC的合成从商业RuO 2粉末通过物理混合的亚微米RuO 2聚集体与MgAl1.2Fe0.8O4尖晶石。原子分散的钌确认通过像差校正的扫描透射电子显微镜和X-射线吸收光谱。详细的研究表明，分散过程并不产生从气体原子捕获机制，而是从反奥斯特瓦尔德熟化促进强共价金属支持相互作用。这种合成策略简单，适合于大规模生产用于工业应用的热稳定SAC。
Single-atom catalysts (SACs) have demonstrated superior catalytic performance in numerous heterogeneous reactions. However, producing thermally stable SACs, especially in a simple and scalable way, remains a formidable challenge. Here, we report the synthesis of Ru SACs from commercial RuO2 powders by physical mixing of sub-micron RuO2 aggregates with a MgAl1.2Fe0.8O4 spinel. Atomically dispersed Ru is confirmed by aberration-corrected scanning transmission electron microscopy and X-ray absorption spectroscopy. Detailed studies reveal that the dispersion process does not arise from a gas atom trapping mechanism, but rather from anti-Ostwald ripening promoted by a strong covalent metal-support interaction. This synthetic strategy is simple and amenable to the large-scale manufacture of thermally stable SACs for industrial applications.