发表文章 - 苏 亚琼
| 论文标题 | Interface dynamics of Pd–CeO2 single-atom catalysts during CO oxidation |
| 作者 | Valery Muravev, Giulia Spezzati, Ya-Qiong Su, Alexander Parastaev, Fu-Kuo Chiang, Alessandro Longo, Carlos Escudero, Nikolay Kosinov, Emiel JM Hensen |
| 发表/完成日期 | 2021-06-01 |
| 期刊名称 | Nature Catalysis |
| 期卷 | 6,4 |
| 相关文章 | |
| 论文简介 | In recent years, noble metals atomically dispersed on solid oxide supports have become a frontier of heterogeneous catalysis. In pursuit of an ultimate atom efficiency, the stability of single-atom catalysts is pivotal. Here we compare two Pd/CeO 2 single-atom catalysts that are active in low-temperature CO oxidation and display drastically different structural dynamics under the reaction conditions. These catalysts were obtained by conventional impregnation on hydrothermally synthesized CeO 2 and one-step flame spray pyrolysis. The oxidized Pd atoms in the impregnated catalyst were prone to reduction and sintering during CO oxidation, whereas they remained intact on the surface of the Pd-doped CeO 2 derived by flame spray pyrolysis. A detailed in situ characterization linked the stability of the Pd single atoms to the reducibility of the Pd–CeO 2 interface and the extent of reverse oxygen spillover. To understand … |
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