Simultaneously activating molecular oxygen and surface lattice oxygen on Pt/TiO2 for low-temperature CO oxidation

Tengfei Zhang, Peng Zheng, Jiajian Gao, Xiaolong Liu (), Yongjun Ji (), Junbo Tian, Yang Zou, Zhiyi Sun, Qiao Hu, Guokang Chen, Wenxing Chen (), Xi Liu (), Ziyi Zhong, Guangwen Xu, Tingyu Zhu () and Fabing Su ()
Additional contact information
Tengfei Zhang: Chinese Academy of Sciences
Peng Zheng: Shenyang University of Chemical Technology
Jiajian Gao: Agency for Science, Technology and Research (A*STAR)
Xiaolong Liu: Chinese Academy of Sciences
Yongjun Ji: Beijing Technology and Business University
Junbo Tian: Chinese Academy of Sciences
Yang Zou: Chinese Academy of Sciences
Zhiyi Sun: Beijing Institute of Technology
Qiao Hu: Shanghai Jiao Tong University
Guokang Chen: Shanghai Jiao Tong University
Wenxing Chen: Beijing Institute of Technology
Xi Liu: Shanghai Jiao Tong University
Ziyi Zhong: Guangdong Technion Israel Institute of Technology (GTIIT)
Guangwen Xu: Shenyang University of Chemical Technology
Tingyu Zhu: Chinese Academy of Sciences
Fabing Su: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Developing high-performance Pt-based catalysts with low Pt loading is crucial but challenging for CO oxidation at temperatures below 100 °C. Herein, we report a Pt-based catalyst with only a 0.15 wt% Pt loading, which consists of Pt–Ti intermetallic single-atom alloy (ISAA) and Pt nanoparticles (NP) co-supported on a defective TiO2 support, achieving a record high turnover frequency of 11.59 s–1 at 80 °C and complete conversion of CO at 120 °C. This is because the coexistence of Pt–Ti ISAA and Pt NP significantly alleviates the competitive adsorption of CO and O2, enhancing the activation of O2. Furthermore, Pt single atom sites are stabilized by Pt–Ti ISAA, resulting in distortion of the TiO2 lattice within Pt–Ti ISAA. This distortion activates the neighboring surface lattice oxygen, allowing for the simultaneous occurrence of the Mars-van Krevelen and Langmuir–Hinshelwood reaction paths at low temperatures.

Date: 2024
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DOI: 10.1038/s41467-024-50790-3

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