In Situ Visualization and Mechanistic Understandings on Facet-Dependent Atomic Redispersion of Platinum on CeO2

• DOI: 10.1021/acs.nanolett.3c04008
• Publication Date: 2023-12-15T19:19:05Z
• Authors: Lei Zhang; Yiming Niu; Yinghui Pu; Yongzhao Wang; Shaoming Dong; Yuefeng Liu; Bingsen Zhang; Zhong-Wen Liu
• Keywords: Oxidizing agent; Platinum nanoparticles; Facet (psychology)

Redispersion is an effective method for regeneration of sintered metal-supported catalysts. However, the ambiguous mechanistic understanding hinders delicate controlling active metals at atomic level. Herein, redispersion mechanism atomically dispersed Pt on CeO2 revealed and manipulated by in situ techniques combining well-designed model nanoparticles (NPs) nano-octahedra under reduction oxidation conditions, while redispersed nanocubes above ∼500 °C oxidizing atmosphere. The dynamic shrinkage disappearance NPs (100) facets was directly visualized TEM. generated with square-planar [PtO4]2+ structure also confirmed Cs-corrected STEM spectroscopy techniques. control were ascribed to high mobility PtO2 temperatures its strong binding O4 sites over (100). These understandings are important regulation platinum