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

doi:10.1016/j.apsusc.2021.151582

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 journal › Article › peer-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 language	English
Article number	151582
Journal	Applied Surface Science
Volume	575
DOIs	https://doi.org/10.1016/j.apsusc.2021.151582
Publication status	Published - 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

Access to Document

10.1016/j.apsusc.2021.151582

Cite this

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

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.",

keywords = "Etched SiO@Pt@ZrO, Simultaneous CO and hydrocarbon oxidation, Thermal stability",

author = "Lee, {Eun Jun} and Yaeun Seo and Haney Park and Kim, {Min June} and Dalyoung Yoon and Choung, {Jin Woo} and Kim, {Chang Hwan} and Jungkyu Choi and Lee, {Kwan Young}",

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: {\textcopyright} 2021",

year = "2022",

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doi = "10.1016/j.apsusc.2021.151582",

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T1 - Development of etched SiO2@Pt@ZrO2 core-shell catalyst for CO and C3H6 oxidation at low temperature

AU - Lee, Eun Jun

AU - Seo, Yaeun

AU - Park, Haney

AU - Kim, Min June

AU - Yoon, Dalyoung

AU - Choung, Jin Woo

AU - Kim, Chang Hwan

AU - Choi, Jungkyu

AU - Lee, Kwan Young

PY - 2022/2/1

Y1 - 2022/2/1

N2 - 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.

AB - 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.

KW - Etched SiO@Pt@ZrO

KW - Simultaneous CO and hydrocarbon oxidation

KW - Thermal stability

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