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Carbon-CeO2 interface confinement enhances the chemical stability of Pt nanocatalyst for catalytic oxidation reactions

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  • ReceivedMar 25, 2020
  • AcceptedApr 16, 2020
  • PublishedJul 10, 2020

Abstract


Funding

the National Key Research and Development Program of China(2016YFB0701100)

the National Natural Science Foundation of China(51771047,51525101,51971059)

and the Fundamental Research Funds for the Central Universities(N180204014)


Acknowledgment

This work was supported by the National Key Research and Development Program of China (2016YFB0701100), the National Natural Science Foundation of China (51771047, 51525101 and 51971059), and the Fundamental Research Funds for the Central Universities (N180204014).


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

Li S and Xu C conceived the idea and designed the experiments. Xu C, Zhang Y, and Chen J carried out the synthesis, characterization and catalytic experiments. All authors contributed to the discussion of the results and commented on the manuscript writing.


Author information

Changjin Xu received his BSc degree from Inner Mongolia Agricultural University in 2014. Currently, he is a PhD student in the School of Materials Science and Engineering at Northeastern University (China). His research interests focus on the heterogeneous nanocatalysts.


Song Li is a professor of materials science and engineering at Northeastern University, China. He received his BSc degree in 2003 from Northeastern University and PhD degree in materials physics from the University of Lorraine in 2009. His current research focuses on metal-based structured catalysts, including noble metal alloys and intermetallics, metal-oxide interfaces, and processing intensification.


Supplementary data

Supplementary information

Experimental details and supporting data are available in the online version of the paper.


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  • Figure 1

    (a) Scheme for preparation of porous CeO2 support by an MOF-assisted strategy. TEM images of Ce-BDC MOFs (b), CeO2-P (c), and CeO2-C (d). (e) TG curves.

  • Figure 2

    HAADF-STEM, TEM-EDX mapping and HRTEM images of Pt/CeO2-C (a, a1–a3), and Pt/CeO2-P (b, b1–b3), respectively. The crystal lattice fringes d=0.31 and 0.23 nm are attributed to (111) facets of CeO2 and (111) planes of Pt, respectively. The white dash circles mark the Pt NPs.

  • Figure 3

    Catalytic performance of the Pt/CeO2 catalysts. (a) CO conversion as function of reaction temperature. (b) CO conversion for stability test at 90°C (mass of catalysts: 70 mg for both catalysts and 25 mg for Pt/CeO2-C to lower the CO conversion). TEM (c, e) and HAADF-STEM (d, f) images of the Pt/CeO2-C (c, d) and Pt/CeO2-P (e,f) catalysts after 20 h stability test.

  • Figure 4

    XPS spectra of Pt 4f peak of the as-prepared fresh Pt/CeO2 catalysts (a) and after the 20 h stability test (b). The ratios of Pt0 in the catalysts are displayed. Raman spectra (c) and Ce 3d XPS spectra (d) of the as-prepared Pt/CeO2 catalysts.

  • Figure 5

    In situ DRIFTS of CO adsorbed on the Pt/CeO2-C (a) and Pt/CeO2-P (b) catalysts recorded under 1% CO, 20% O2, and N2 as balance.

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