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Dispersion and support dictated properties and activities of Pt/metal oxide catalysts in heterogeneous CO oxidation

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Abstract

The source of activity of metal/metal oxides has always been an interesting, important but highly challenging research topic in heterogeneous catalysis. In CO oxidation reaction, this work clarifies dispersion and support dictated activities of Pt including single-atom (Pt1), 2.8 nm (PtNP-S) and 36 nm (PtNP-L) Pt supported on both reducible TiO2 and “inert” Al2O3 supports. The X-ray absorption fine structure (XAFS) shows that chemical state of Pt is affected by both dispersion and support: Pt1 presents fully oxidized state in both Pt1/TiO2 and Pt1/Al2O3; PtNP-S in PtNP-S/TiO2 appear nearly oxidized state while about half of Pt is metallic state in PtNP-S/Al2O3; PtNP-L in both PtNP-L/TiO2 and PtNP-L/Al2O3 exhibit metallic state. All the Pt species supported on TiO2 present much lower apparent activation barriers (Eapp) than that on Al2O3. Moreover, Pt1/TiO2 possesses dozen times of efficiency than PtNP-S/TiO2 although they have similar Eapp values. A truth is finally made clear that a reducible metal oxide with low oxygen vacancy formation energy is critical to endow Pt/metal oxide a high activity and the single-atom dispersion of Pt is the way to maximize the active sites of Pt/metal oxide.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 21801003 and 21871005), the Natural Science Foundation of Anhui Province (No. 1808085QB47), the University Synergy Innovation Program of Anhui Province (No. GXXT-2020-005), Fund for Outstanding Youth of Anhui Polytechnic University (Nos. 2019JQ01 and 2016BJRC001). The authors thank the National Synchrotron Radiation Laboratory (Beijing) for EXAFS collection and Hangzhou Precision New Materials and Technology Co., Ltd. (Hangzhou, China) for the DFT study.

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  1. Jiaojiao Song and Yixuan Yang contributed equally to this work.

Authors and Affiliations

  1. School of Chemical and Environmental Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Clean Energy Materials and Chemistry for Sustainable Conversion of Natural Resources, Anhui Polytechnic University, Wuhu, 241000, China

    Jiaojiao Song, Yixuan Yang, Yuteng Fan, Zhiming Chen & Long Kuai

  2. College of Chemistry and Materials Science, The key Laboratory of Functional Molecular Solids, Ministry of Education, the Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials, Anhui Normal University, Wuhu, 241002, China

    Shoujie Liu, Nan Yu & Baoyou Geng

  3. Chemistry and Chemical Engineering of Guangdong Laboratory, Shantou, 515063, China

    Shoujie Liu

  4. Chongqing Key Laboratory of Extraordinary Coordination Bond and Advanced Materials Techniques, Yangtze Normal University, Chongqing, 408100, China

    Lei Li

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  1. Jiaojiao Song
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Song, J., Yang, Y., Liu, S. et al. Dispersion and support dictated properties and activities of Pt/metal oxide catalysts in heterogeneous CO oxidation. Nano Res. 14, 4841–4847 (2021). https://doi.org/10.1007/s12274-021-3443-7

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