How Pt Interacts with CeO2 under the Reducing and Oxidizing Environments at Elevated Temperature: The Origin of Improved Thermal Stability of Pt/CeO2 Compared to CeO2
2016 · The Journal of Physical Chemistry C
저자
Jaeha Lee, YoungSeok Ryou, Xiaojun Chan, Taejin Kim, 김도희 (Do Heui Kim)
연구주제
Catalytic Processes in Materials Science · Catalysts for Methane Reforming · Catalysis and Oxidation Reactions
NTIS 과학기술표준분류
가장 가까운 분류(재료 > 고분자재료 > 특수기능성 소재기술)가 화학·화공 범위 밖이다. 배정 근거: AI 키워드가 잡은 NTIS 과제의 분류.
AI 연구 키워드·방법
금속-지지체 상호작용(MSI) 산소 공공 백금-세리아 촉매 열 안정성
co chemisorption 라만 분광법 X선 광전자 분광법(XPS)
키워드 (OpenAlex)
Pt/CeO2 thermal stability oxidation treatment reducing conditions oxygen vacancies surface oxygen removal CO chemisorption hydrogen reduction
초록
The interaction between Pt and CeO 2 under reducing and oxidizing conditions as well as its effect on the thermal stability of Pt/CeO 2 were extensively investigated by means of N 2 adsorption/desorption, Raman spectroscopy, CO chemisorption, H 2 TPR, XRD, and XPS techniques. In situ and ex situ Raman spectroscopy showed that Pt is anchored with the surface oxygen of CeO 2 by forming Pt–O–Ce bond during the oxidative treatment of Pt/CeO 2 . Under the reducing condition, the static CO chemisorption presented that the amount of CO adsorbed on CeO 2 is almost equal to that on Pt/CeO 2, implying that Pt atom is located on the oxygen vacancy generated on reduced CeO 2 surface. Strong Pt–O–Ce bond maintained the textural properties of Pt/CeO 2 from oxidative treatment at temperature as high as 800 °C, as evidenced by the XRD patterns and BJH curves of the samples. Selective removal of the surf…
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교수 1
연구주제 1
Catalytic Processes in Materials Science
키워드 4
산소 공공 · 백금-세리아 촉매 · 금속-지지체 상호작용(MSI) · 열 안정성