Tandem catalysis for Enhanced CO Oxidation over the Bi-Au-SiO2 Interface

分类： 物理学 >> 核物理学 提交时间： 2023-06-20

Zhang, Huan Xie, Lei Liang, Zhao-feng Huang, Chao-qin Wang, Hong-bing Hu, Jin-ping Jiang, Zheng Song, Fei

摘要： Bimetallic catalysts typically exploitunique synergetic effects betweentwo metal species to achieve theircatalytic . Understanding the mechanism of CO oxidation using hybrid heterogeneous catalysts is important for effective catalyst design and environmental protection. Herein, we report a Bi-Au/SiO2tandem bimetallic catalyst forCO oxidation reactionoverthe Au/SiO2surface, which was monitoredusingnear-ambient-pressure X-ray photoelectron spectroscopy. The Au-decorated SiO2catalyst exhibited scarce activity in the CO oxidation reaction; However, the introduction of Bi to the Au/SiO2system promoted the catalytic activity. The mechanism is thought to involve the dissociationO2molecules in the presence of Bi, which results inspilloverofthe O species to adjacent Au atoms, thereby formingAu+. Further CO adsorption, followed by thermal treatment, facilitated theoxidation ofCO at the Au-Bi interface, resulting in a reversible reversion to the neutral Au valence state. Our work provides insightinto the mechanism of CO oxidation on tandem surfaces and will facilitatethe rational design of other Au-based catalysts

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