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Understanding the intrinsic synergistic mechanism between Pt-O-Ti interface sites and TiO2 surface sites of Pt/TiO2 catalysts in Fenton-like reaction

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Abstract

Identifying the active site of oxide-supported metal catalysts and revealing the intrinsic synergistic mechanism between metal and oxide support remain a large challenge. Herein, we report the identification and separation of the Pt-O-Ti interface and TiO2 surface in Pt-TiO2-based catalysts by depositing different thickness of TiO2 shell with ∼0.4-nm micropores onto the surface of Pt/TiO2 catalyst through atomic layer deposition (ALD). In the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by hydrogen peroxide (H2O2) process, the TiO2 microporous shells can prevent the contact between TMB and embedded Pt clusters, but not delay the diffusion of H2O2. The heterolysis of H2O2 to •OH occurs on the Pt-O-Ti interface, and the generated •OH migrates to the TiO2 surface to supplement the surface lattice oxygen, which sequentially oxidizes TMB to oxTMB. And the synergistic effect between Pt-O-Ti interface active sties and TiO2 surface active sites can significantly improve the catalytic performance. Our study provides a guide for the understanding of the intrinsic synergistic mechanism between the metal and oxide support in the metal-oxide catalysts.

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Acknowledgements

This work was financially supported from the National Natural Science Foundation of China (21802094, 22272127, 22002118, and 22172119), the National Science Fund for Distinguished Young Scholars (21825204), the Fundamental Research Funds for the Central Universities (D5000210666), and the Natural Science Basic Research Plan in Shaanxi Province of China (2021JM-047).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Interdisciplinary Research Center of Biology & Catalysis, School of Life Sciences, Northwestern Polytechnical University, Xi’an, 710072, China

    Yawen Ma, Huibin Ge, Siwen Yi, Yujing Ren, Jie Gao & Yong Qin

  2. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Man Yang

  3. Analytical & Testing Center, Northwestern Polytechnical University, Xi’an, 710072, China

    Dan Feng

  4. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China

    Yong Qin

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  1. Yawen Ma
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  2. Huibin Ge
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  3. Siwen Yi
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  4. Man Yang
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  5. Dan Feng
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  6. Yujing Ren
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Correspondence to Huibin Ge or Yong Qin.

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Conflict of interest The authors declare no conflict of interest.

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Supporting information The supporting information is available online at https://chem.scichina.com and https://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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11426_2022_1414_MOESM1_ESM.pdf

Understanding the intrinsic synergistic mechanism between Pt-O-Ti interface sites and TiO2 surface sites of Pt/TiO2 catalysts in Fenton-like reaction

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Ma, Y., Ge, H., Yi, S. et al. Understanding the intrinsic synergistic mechanism between Pt-O-Ti interface sites and TiO2 surface sites of Pt/TiO2 catalysts in Fenton-like reaction. Sci. China Chem. 65, 2596–2603 (2022). https://doi.org/10.1007/s11426-022-1414-5

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  • DOI: https://doi.org/10.1007/s11426-022-1414-5

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