Insight into the Dynamic Nature of the Pt-CeO₂ Interface in Dry Reforming of Methane

Single-atom catalysts (SACs) are attractive in one-carbon (C1) chemistry because of their high atom efficiency. However, it is a great challenge for understanding the dynamic roles of SACs under operating conditions. Here, isolated Pt atoms trapped on defective CeO₂ surface are investigated by experiments, especially operando techniques, which offers basic understanding of the nature and dynamic evolution of the Pt-CeO₂ interface in dry reforming of methane (DRM). The Pt-O_lattice configuration is highly active for CH₄ dissociation at the expense of the O_lattice atoms, which in turn promotes the H-assisted dissociation of CO₂. The transformation of Pt atoms between positive and metallic states is driven by the DRM reaction, which is essential for rendering highly efficient catalysis. The dynamic evolution of Pt atoms favors to eliminate the reactive intermediates, such as carbonates and formates. The dynamic nature of the Pt-CeO₂ interface in the DRM reaction shows a similar picture to the Yin and Yang transformation in ancient Chinese Tai Ji wisdom.