Development of etched SiO2@Pt@ZrO(2 )core-shell catalyst for CO and C3H6 oxidation at low temperature
- Authors
- Lee, Eun Jun; Seo, Yaeun; Park, Haney; Kim, Min June; Yoon, Dalyoung; Choung, Jin Woo; Kim, Chang Hwan; Choi, Jungkyu; Lee, Kwan-Young
- Issue Date
- 1-2월-2022
- Publisher
- ELSEVIER
- Keywords
- Simultaneous CO and hydrocarbon oxidation; Etched SiO2 @Pt@ZrO2; Thermal stability
- Citation
- APPLIED SURFACE SCIENCE, v.575
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 575
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135227
- DOI
- 10.1016/j.apsusc.2021.151582
- ISSN
- 0169-4332
- 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 degrees 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.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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