EXAFS study of the CO-adsorption-induced morphology change in rutheniun clusters supported on alumina

Takanori Mizushima; Kazuyuki Tohji; Yasuo Udagawa; Akifumi Ueno

doi:10.1021/j100375a041

EXAFS study of the CO-adsorption-induced morphology change in rutheniun clusters supported on alumina

Takanori Mizushima, Kazuyuki Tohji, Yasuo Udagawa, Akifumi Ueno

ENV - Environmental Studies for Advanced Society

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

52 Citations (Scopus)

Abstract

Highly dispersed Ru/Al₂O₃ catalysts were prepared from Ru₃(CO)₁₂. EXAFS (extended X-ray absorption fine structure) studies show that all the Ru atoms in the catalyst are in small metal clusters. The Ru clusters are so small that the oxygen atoms at the cluster-support interface have a significant contribution to the EXAFS signal. Adsorption of CO completely changes the structure of this small metal cluster as is evidenced from EXAFS oscillation; Ru-Ru bonds are disrupted and Al-O-Ru-(CO)_n (n = 1-2) is formed. When the temperature is raised, Ru atoms agglomerate and small metal clusters are recovered. Infrared spectroscopic observation supports the conclusions obtained from EXAFS.

Original language	English
Pages (from-to)	4980-4985
Number of pages	6
Journal	Journal of physical chemistry
Volume	94
Issue number	12
DOIs	https://doi.org/10.1021/j100375a041
Publication status	Published - 1990

ASJC Scopus subject areas

Engineering(all)
Physical and Theoretical Chemistry

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title = "EXAFS study of the CO-adsorption-induced morphology change in rutheniun clusters supported on alumina",

abstract = "Highly dispersed Ru/Al2O3 catalysts were prepared from Ru3(CO)12. EXAFS (extended X-ray absorption fine structure) studies show that all the Ru atoms in the catalyst are in small metal clusters. The Ru clusters are so small that the oxygen atoms at the cluster-support interface have a significant contribution to the EXAFS signal. Adsorption of CO completely changes the structure of this small metal cluster as is evidenced from EXAFS oscillation; Ru-Ru bonds are disrupted and Al-O-Ru-(CO)n (n = 1-2) is formed. When the temperature is raised, Ru atoms agglomerate and small metal clusters are recovered. Infrared spectroscopic observation supports the conclusions obtained from EXAFS.",

author = "Takanori Mizushima and Kazuyuki Tohji and Yasuo Udagawa and Akifumi Ueno",

year = "1990",

doi = "10.1021/j100375a041",

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journal = "Journal of Physical Chemistry",

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T1 - EXAFS study of the CO-adsorption-induced morphology change in rutheniun clusters supported on alumina

AU - Mizushima, Takanori

AU - Tohji, Kazuyuki

AU - Udagawa, Yasuo

AU - Ueno, Akifumi

PY - 1990

Y1 - 1990

N2 - Highly dispersed Ru/Al2O3 catalysts were prepared from Ru3(CO)12. EXAFS (extended X-ray absorption fine structure) studies show that all the Ru atoms in the catalyst are in small metal clusters. The Ru clusters are so small that the oxygen atoms at the cluster-support interface have a significant contribution to the EXAFS signal. Adsorption of CO completely changes the structure of this small metal cluster as is evidenced from EXAFS oscillation; Ru-Ru bonds are disrupted and Al-O-Ru-(CO)n (n = 1-2) is formed. When the temperature is raised, Ru atoms agglomerate and small metal clusters are recovered. Infrared spectroscopic observation supports the conclusions obtained from EXAFS.

AB - Highly dispersed Ru/Al2O3 catalysts were prepared from Ru3(CO)12. EXAFS (extended X-ray absorption fine structure) studies show that all the Ru atoms in the catalyst are in small metal clusters. The Ru clusters are so small that the oxygen atoms at the cluster-support interface have a significant contribution to the EXAFS signal. Adsorption of CO completely changes the structure of this small metal cluster as is evidenced from EXAFS oscillation; Ru-Ru bonds are disrupted and Al-O-Ru-(CO)n (n = 1-2) is formed. When the temperature is raised, Ru atoms agglomerate and small metal clusters are recovered. Infrared spectroscopic observation supports the conclusions obtained from EXAFS.

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