Study of the interfacial structure of a Pt/α-Al2O 3 model catalyst under high-temperature hydrogen reduction

Xiaoyan Zhong; Jing Zhu; Jingyue Liu

doi:10.1016/j.jcat.2005.06.018

Study of the interfacial structure of a Pt/α-Al₂O ₃ model catalyst under high-temperature hydrogen reduction

Xiaoyan Zhong, Jing Zhu, Jingyue Liu

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

We investigated the interface structure between the Pt nanoparticles and the alumina support in a Pt/Al₂O₃ model catalyst reduced in flowing hydrogen gas at different temperatures by cross-sectional atomic-resolution transmission electron microscopy nanodiffraction techniques. An interfacial Pt₈Al₂₁ alloy with a tetragonal structure was formed at the Pt-alumina interface during the high-temperature reduction at 1073 K. This alloy phase was not formed when the Pt/Al₂O₃ model catalyst was reduced at 773 K. The platinum-assisted reduction of the alumina support and the subsequent strong metal-support interaction at the interface may be responsible for the formation of the interfacial alloy phase.

Original language	English (US)
Pages (from-to)	9-13
Number of pages	5
Journal	Journal of Catalysis
Volume	236
Issue number	1
DOIs	https://doi.org/10.1016/j.jcat.2005.06.018
State	Published - Nov 15 2005
Externally published	Yes

Keywords

Alumina
Catalyst
Electron microscopy
Interfacial phase
Metal-support interaction
Platinum

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

Access to Document

10.1016/j.jcat.2005.06.018

Cite this

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title = "Study of the interfacial structure of a Pt/α-Al2O 3 model catalyst under high-temperature hydrogen reduction",

abstract = "We investigated the interface structure between the Pt nanoparticles and the alumina support in a Pt/Al2O3 model catalyst reduced in flowing hydrogen gas at different temperatures by cross-sectional atomic-resolution transmission electron microscopy nanodiffraction techniques. An interfacial Pt8Al21 alloy with a tetragonal structure was formed at the Pt-alumina interface during the high-temperature reduction at 1073 K. This alloy phase was not formed when the Pt/Al2O3 model catalyst was reduced at 773 K. The platinum-assisted reduction of the alumina support and the subsequent strong metal-support interaction at the interface may be responsible for the formation of the interfacial alloy phase.",

keywords = "Alumina, Catalyst, Electron microscopy, Interfacial phase, Metal-support interaction, Platinum",

author = "Xiaoyan Zhong and Jing Zhu and Jingyue Liu",

note = "Funding Information: This work was supported by the National 973 Project of China, the Chinese National Nature Science Foundation, and the National Center for Nanoscience and Technology of China. X.Y. Zhong thanks Professor Furong Chen, National Tsinghua University, for helpful discussions. ",

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T1 - Study of the interfacial structure of a Pt/α-Al2O 3 model catalyst under high-temperature hydrogen reduction

AU - Zhong, Xiaoyan

AU - Zhu, Jing

AU - Liu, Jingyue

N1 - Funding Information: This work was supported by the National 973 Project of China, the Chinese National Nature Science Foundation, and the National Center for Nanoscience and Technology of China. X.Y. Zhong thanks Professor Furong Chen, National Tsinghua University, for helpful discussions.

PY - 2005/11/15

Y1 - 2005/11/15

N2 - We investigated the interface structure between the Pt nanoparticles and the alumina support in a Pt/Al2O3 model catalyst reduced in flowing hydrogen gas at different temperatures by cross-sectional atomic-resolution transmission electron microscopy nanodiffraction techniques. An interfacial Pt8Al21 alloy with a tetragonal structure was formed at the Pt-alumina interface during the high-temperature reduction at 1073 K. This alloy phase was not formed when the Pt/Al2O3 model catalyst was reduced at 773 K. The platinum-assisted reduction of the alumina support and the subsequent strong metal-support interaction at the interface may be responsible for the formation of the interfacial alloy phase.

AB - We investigated the interface structure between the Pt nanoparticles and the alumina support in a Pt/Al2O3 model catalyst reduced in flowing hydrogen gas at different temperatures by cross-sectional atomic-resolution transmission electron microscopy nanodiffraction techniques. An interfacial Pt8Al21 alloy with a tetragonal structure was formed at the Pt-alumina interface during the high-temperature reduction at 1073 K. This alloy phase was not formed when the Pt/Al2O3 model catalyst was reduced at 773 K. The platinum-assisted reduction of the alumina support and the subsequent strong metal-support interaction at the interface may be responsible for the formation of the interfacial alloy phase.

KW - Alumina

KW - Catalyst

KW - Electron microscopy

KW - Interfacial phase

KW - Metal-support interaction

KW - Platinum

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