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- W3208549583 endingPage "151582" @default.
- W3208549583 startingPage "151582" @default.
- W3208549583 abstract "In our previous study, we conducted CO oxidation with SiO2@[email protected]2 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@[email protected]2 catalysts were examined for the simultaneous oxidation of CO and hydrocarbons. SiO2@[email protected]2 catalysts had improved thermal stability compared to Pt/SiO2 or Pt/ZrO2 after aging at 750 °C for 25 h. However, fresh SiO2@[email protected]2 catalysts showed low oxidation activity because of the low gas accessibility due to the thick ZrO2 shell. Therefore, we proposed etched SiO2@[email protected]2 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." @default.
- W3208549583 created "2021-11-08" @default.
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- W3208549583 date "2022-02-01" @default.
- W3208549583 modified "2023-09-26" @default.
- W3208549583 title "Development of etched SiO2@Pt@ZrO2 core-shell catalyst for CO and C3H6 oxidation at low temperature" @default.
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- W3208549583 doi "https://doi.org/10.1016/j.apsusc.2021.151582" @default.
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