Development of etched SiO2@Pt@ZrO2 core-shell catalyst for CO and C3H6 oxidation at low temperature

Eun Jun Lee, Yaeun Seo, Haney Park, Min June Kim, Dalyoung Yoon, Jin Woo Choung, Chang Hwan Kim, Jungkyu Choi, Kwan Young Lee

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    In our previous study, we conducted CO oxidation with SiO2@Pd@CeO2 catalysts. However, the limit of the CeO2 shell thickness limited the thermal stability. So, in this study, thick ZrO2 shell was introduced to improve thermal stability. SiO2@Pt@ZrO2 catalysts were examined for the simultaneous oxidation of CO and hydrocarbons. SiO2@Pt@ZrO2 catalysts had improved thermal stability compared to Pt/SiO2 or Pt/ZrO2 after aging at 750 °C for 25 h. However, fresh SiO2@Pt@ZrO2 catalysts showed low oxidation activity because of the low gas accessibility due to the thick ZrO2 shell. Therefore, we proposed etched SiO2@Pt@ZrO2 catalysts for enhanced gas accessibility. The selective etching of SiO2 was adjusted by varying the KOH concentration. TEM images confirmed that the void space of the core-shell catalysts increased as the concentration of KOH increased. The exposed Pt surface area increased as the void space of the core-shell catalysts was increased. On the other hand, in excessively etched 3.2 M catalysts, the core-shell structure collapsed. Etched catalysts which maintain the core-shell structure improve thermal stability after hydrothermal aging. As a result, 1.6 M catalysts showed the best simultaneous oxidation of CO and hydrocarbons, and we confirmed that properly etched catalysts enhanced the oxidation activity and thermal stability.

    Original languageEnglish
    Article number151582
    JournalApplied Surface Science
    Volume575
    DOIs
    Publication statusPublished - 2022 Feb 1

    Bibliographical note

    Funding Information:
    This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2016R1A5A1009592).

    Publisher Copyright:
    © 2021

    Keywords

    • Etched SiO@Pt@ZrO
    • Simultaneous CO and hydrocarbon oxidation
    • Thermal stability

    ASJC Scopus subject areas

    • General Chemistry
    • Condensed Matter Physics
    • General Physics and Astronomy
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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