Exploring\nthe Facet-Dependent\nStructural Evolution\nof Pt/CeO<sub>2</sub> Catalysts Induced by Typical Pretreatments for\nCO Oxidation

Atomic-scale\ninsights into the interactions between metals\nand\nsupports play a crucial role in optimizing catalyst design, understanding\ncatalytic mechanisms, and enhancing chemical conversion processes.\nThe effects of oxide support on the dynamic behavior of supported\nmetal species during pretreatments or reactions have been attracting\na lot of attention; however, very less systematic integrations are\ncarried out experimentally using real catalysts. In this study, we\nhere utilized facet-controlled CeO<sub>2</sub> as examples to explore\ntheir influence on the supported Pt species (1.0 wt %) during the\nreducing and oxidizing pretreatments that are typically applied in\nheterogeneous catalysts. By employing a combination of microscopy,\nspectroscopy, and first-principles calculations, it is demonstrated\nthat the exposed crystal facets of CeO<sub>2</sub> govern the evolution\nbehavior of supported Pt species under different environmental conditions.\nThis leads to distinct local coordinations and charge states of the\nPt species, which directly influence the catalytic reactivity and\ncan be leveraged to control the catalytic performance for CO oxidation\nreactions.