Liu Kaipeng, Zhao Xintian, Ren Guoqing, Yang Tao, Ren Yujing, Lee Adam Fraser, Su Yang, Pan Xiaoli, Zhang Jingcai, Chen Zhiqiang, Yang Jingyi, Liu Xiaoyan, Zhou Tong, Xi Wei, Luo Jun, Zeng Chaobin, Matsumoto Hiroaki, Liu Wei, Jiang Qike, Wilson Karen, Wang Aiqin, Qiao Botao, Li Weizhen, Zhang Tao
CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023, Dalian, China.
University of Chinese Academy of Sciences, 100049, Beijing, China.
Nat Commun. 2020 Mar 9;11(1):1263. doi: 10.1038/s41467-020-14984-9.
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 RuO powders by physical mixing of sub-micron RuO aggregates with a MgAlFeO 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.
单原子催化剂（SACs）在众多多相反应中已展现出卓越的催化性能。然而，制备热稳定的单原子催化剂，尤其是以简单且可扩展的方式来制备，仍然是一项艰巨的挑战。在此，我们报告了通过将亚微米级的RuO聚集体与MgAlFeO尖晶石进行物理混合，从商用RuO粉末合成Ru单原子催化剂。通过像差校正扫描透射电子显微镜和X射线吸收光谱法证实了Ru原子的分散。详细研究表明，分散过程并非源于气体原子捕获机制，而是源于由强共价金属-载体相互作用促进的反奥斯特瓦尔德熟化。这种合成策略简单易行，适合大规模制造用于工业应用的热稳定单原子催化剂。
