Dual Activation of Molecular Oxygen and Surface Lattice Oxygen in Single Atom Cu<sub>1</sub>/TiO<sub>2</sub> Catalyst for CO Oxidation
Yarong Fang, Qi Zhang, Huan Zhang, Xiaomin Li, Wei Chen, Jue Xu, Huan Shen, Ji Yang, Chuanqi Pan, Yuhua Zhu, Jinlong Wang, Zhu Luo, Liming Wang, Xuedong Bai, Fei Song, Lizhi Zhang, Yanbing Guo
Abstract
Abstract The in‐depth mechanism on the simultaneous activation of O 2 and surface lattice O 2− on one active metallic site has not been elucidated yet. Herein, we report a strategy for the construction of abundant oxygen activation sites by rational design of Cu 1 /TiO 2 single atom catalysts (SACs). The charge transfer between isolated Cu and TiO 2 support generates abundant Cu I and 2‐coordinated O lat sites in Cu 1 −O−Ti hybridization structure, which facilitates the chemisorption and activation of O 2 molecules. Simultaneously, the Cu 1 −O−Ti induced TiO 2 lattice distortion activate the adjacent surface lattice O 2− , achieving the dual activation of O 2 and surface lattice O 2− . The Cu 1 −O−Ti active site switches the CO oxidation mechanism from Eley‐Rideal (80 °C) to Mars–van Krevelen route (200 °C) with the increase of reaction temperature. The dual activation of O 2 and surface lattice O 2− can by modulating the electron properties of SACs can boost the heterogeneous catalytic oxidation activity.