Surface Restructuring of Supported Nano-Ceria for Improving Sulfur Resistance

  • Beom-Sik Kim
    Beom-Sik Kim
    Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
    More by Beom-Sik Kim
  • Junemin Bae
    Junemin Bae
    Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
    More by Junemin Bae
  • Hojin Jeong
    Hojin Jeong
    Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
    More by Hojin Jeong
  • Chanyeong Choe
    Chanyeong Choe
    Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
  • , and 
  • Hyunjoo Lee*
    Hyunjoo Lee
    Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
    *E-mail, [email protected]. Tel.: +82-42-350-3922.
    More by Hyunjoo Lee
Cite this: ACS Catal. 2021, 11, 12, 7154–7159
Publication Date (Web):June 3, 2021
https://doi.org/10.1021/acscatal.1c02209
Copyright © 2021 American Chemical Society
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Abstract

Developing sulfur-tolerant catalysts is crucial, yet challenging. Pt catalyst deposited on ceria typically shows high activity for oxidation, but it suffers from sulfur poisoning, because ceria may easily convert into cerium sulfates in the presence of sulfur, causing significant degradation in activity. Here, a Pt catalyst deposited on CeO2–Al2O3 support was synthesized with the octahedral shape of nanoceria. The highly defective nanoceria were immobilized on γ-Al2O3, which was a priori activated to have Alpenta3+ sites. Then, the CeO2–Al2O3 support was hydrothermally treated at 750 °C for 25 h. The morphology of supported nanoceria was stabilized into octahedra with a minimal amount of Ce3+. The surface oxygen defects and basicity could be controlled by varying hydrothermal treatment temperatures. After the Pt deposition on the support, the catalyst was used for CO oxidation in the presence of SO2. The catalyst with octahedral nanoceria showed better sulfur resistance upon sulfation and outstanding resilience after desulfation. The formation of the sulfate species was hindered on the restructured nanoceria due to its low basicity. This work provides a useful guideline for increasing the sulfur resistance in heterogeneous catalysts.

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