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Investigation in the influence of metal-support interactions on the thermal stability of CeO2 nanorods
封面论文- NUCLEAR TECHNIQUES Vol. 41, Issue 8, Article number: 080501(2018)
- 作者机构：
1.中国科学院上海微系统与信息技术研究所 信息功能材料国家重点实验室 上海 200050
2.上海科技大学 物质科学与技术学院 上海 201210
3.中国科学院大学 北京 100049
- 作者简介：
- 基金信息：National Natural Science Foundation of China;Science and Technology Commission of Shanghai Municipality
DOI：10.11889/j.0253-3219.2018.hjs.41.080501
CLC： O647Received：22 March 2018，
Revised：03 April 2018，
Published：2018-08
- 稿件说明：
移动端阅览
Zhifeng LI, Qingtian LI, Beibei WANG, et al. Investigation in the influence of metal-support interactions on the thermal stability of CeO2 nanorods[J]. Nuclear techniques, 2018, 41(8): 080501
Zhifeng LI, Qingtian LI, Beibei WANG, et al. Investigation in the influence of metal-support interactions on the thermal stability of CeO2 nanorods[J]. Nuclear techniques, 2018, 41(8): 080501 DOI： 10.11889/j.0253-3219.2018.hjs.41.080501.
摘要
CeO
2
因其优异的储氧和释氧能力而被广泛应用于催化领域。其中，氧空位浓度是决定其储氧和释氧能力的关键。为了研究退火和负载金属对CeO
2
氧空位浓度和热稳定性的影响，本工作通过水热法合成了CeO
2
纳米棒，并负载金属Pt。利用X射线衍射（X-ray Diffraction，XRD）、透射电子显微镜（Transmission Electron Microscopy，TEM）、拉曼光谱（Raman spectroscopy）、电感耦合等离子体光谱（Inductively Coupled Plasma spectrometer，ICP）和X射线光电子能谱（X-ray Photoelectron Spectroscopy，XPS）实验手段研究了金属载体相互作用对CeO
2
纳米棒热稳定性的影响。结果表明：CeO
2
纳米棒的氧空位浓度和晶格常数之间存在线性关系，氧空位浓度降低会导致晶格常数减小。在高纯空气中退火会导致CeO
2
纳米棒的氧空位浓度降低，晶格常数减小。XPS和XRD结果显示：Pt/CeO
2
纳米棒退火后仍保持较高的氧空位浓度。同时，ICP结合XPS发现退火会导致Pt向CeO
2
体相扩散，抑制了PtO
2
的生成，提高Pt/CeO
2
催化剂的稳定性。上述结果说明Pt和CeO
2
之间的相互作用既有利于氧空位的保持，也提升了Pt的稳定性。这对于理解Pt/CeO
2
优异的催化性能具有重要帮助。
Abstract
Background
2
The oxygen vacancies concentration and thermal stability of CeO
2
based catalysts play an important role in their catalytic performance. However
the effect of metal loading on oxygen vacancy and thermal stability remains ambiguous. Therefore
a comprehensive and systematic method for elucidating the oxygen vacancies and the strong synergistic metal-support interactions in CeO
2
nanocrystals is desirable.
Purpose
2
This work aims to determine the relationship between the lattice constant and the concentration of oxygen vacancies
and to highlight the strong synergistic metal-support interactions in CeO
2
nanocrystals using bulk and surface characterization tools.
Methods
2
The samples were characterized by X-ray diffraction (XRD)
Raman spectroscopy
transmission electron microscopy (TEM)
X-ray photoelectron spectroscopy (XPS)
and inductively coupled plasma spectrometer (ICP).
Results
2
The XRD results indicate that the lattice constant of annealed CeO
2
was smaller than that of as-synthesized CeO
2
due to the decrease in oxygen vacancy concentration. Therefore
a linear relationship between lattice constant and oxygen vacancy concentration is established. Compared with as-synthesized and annealed CeO
2
Pt/CeO
2
nanorods present higher oxygen vacancy concentrations. The XPS
XRD and ICP results show that Pt diffuse into the CeO
2
during the annealing process. Hence
the strong synergistic metal-support interactions between Pt and CeO
2
protect the Pt clusters from further oxidation to PtO
2
.
Conclusion
2
The relationship between lattice constant and the concentration of oxygen vacancies in CeO
2
shows that a decrease in lattice constant is related to the decrease in concentration of oxygen vacancies when CeO
2
is annealed in dry air. Moreover
the Pt loading distorts the lattice structure of CeO
2
thereby increasing its lattice strain and the lattice constant. Accordingly
Pt diffusion into CeO
2
at high temperature is responsible for the improved thermal stability of oxygen vacancy and Pt/CeO
2
.
关键词
Keywords
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