Formation and growth of a Ru cluster in a Y zeolite supercage probed by 129Xe NMR spectroscopy and xenon adsorption measurements

Sung June Cho, Seong Moon Jung, Yong-Gun Shul, Ryong Ryoo

Research output: Contribution to journalArticle

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Abstract

Ruthenium was supported as a ruthenium-red complex ion on NaY zeolite by stirring the zeolite powder in an aqueous solution of RuCl3 containing ammonia at 350 K. The formation of a Ru cluster in the zeolite supercage due to the reduction of the Ru complex and subsequent growth of the Ru cluster upon heating in vacuum, H2, and O2 were studied by the measurement of xenon adsorption on Ru, the 129Xe NMR spectrum of the adsorbed xenon, the transmission electron micrograph, and the extended X-ray absorption fine structure of Ru. The results showed that very small Ru clusters consisting of ca. 20 Ru atoms on average can be obtained in the supercage due to the autoreduction of the supported ruthenium species during the evacuation of the sample under heating to 673 K, and the average number of Ru atoms per cluster gradually increased to 50 upon further heating to 823 K both in H2 and under vacuum. The xenon adsorption data indicated that the exposure of the 20-atom cluster to O2 resulted in much more severe increase of the cluster size than that caused by H2 and vacuum at the same temperature, e.g., increasing the average number of Ru atoms per cluster to 45 after the exposure to 1 atm of O2 at room temperature and resulting in the formation of large Ru agglomerates greater than 100 nm on the external surface of the zeolite crystal after exposure to O2 at 673 K.

Original languageEnglish
Pages (from-to)9922-9927
Number of pages6
JournalJournal of Physical Chemistry
Volume96
Issue number24
Publication statusPublished - 1992 Dec 1

Fingerprint

Zeolites
Xenon
xenon
Nuclear magnetic resonance spectroscopy
Ruthenium
Adsorption
Atoms
nuclear magnetic resonance
adsorption
Vacuum
Heating
spectroscopy
ruthenium
Ruthenium Red
X ray absorption
vacuum
heating
atoms
Ammonia
Powders

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

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title = "Formation and growth of a Ru cluster in a Y zeolite supercage probed by 129Xe NMR spectroscopy and xenon adsorption measurements",
abstract = "Ruthenium was supported as a ruthenium-red complex ion on NaY zeolite by stirring the zeolite powder in an aqueous solution of RuCl3 containing ammonia at 350 K. The formation of a Ru cluster in the zeolite supercage due to the reduction of the Ru complex and subsequent growth of the Ru cluster upon heating in vacuum, H2, and O2 were studied by the measurement of xenon adsorption on Ru, the 129Xe NMR spectrum of the adsorbed xenon, the transmission electron micrograph, and the extended X-ray absorption fine structure of Ru. The results showed that very small Ru clusters consisting of ca. 20 Ru atoms on average can be obtained in the supercage due to the autoreduction of the supported ruthenium species during the evacuation of the sample under heating to 673 K, and the average number of Ru atoms per cluster gradually increased to 50 upon further heating to 823 K both in H2 and under vacuum. The xenon adsorption data indicated that the exposure of the 20-atom cluster to O2 resulted in much more severe increase of the cluster size than that caused by H2 and vacuum at the same temperature, e.g., increasing the average number of Ru atoms per cluster to 45 after the exposure to 1 atm of O2 at room temperature and resulting in the formation of large Ru agglomerates greater than 100 nm on the external surface of the zeolite crystal after exposure to O2 at 673 K.",
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Formation and growth of a Ru cluster in a Y zeolite supercage probed by 129Xe NMR spectroscopy and xenon adsorption measurements. / Cho, Sung June; Jung, Seong Moon; Shul, Yong-Gun; Ryoo, Ryong.

In: Journal of Physical Chemistry, Vol. 96, No. 24, 01.12.1992, p. 9922-9927.

Research output: Contribution to journalArticle

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T1 - Formation and growth of a Ru cluster in a Y zeolite supercage probed by 129Xe NMR spectroscopy and xenon adsorption measurements

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AU - Jung, Seong Moon

AU - Shul, Yong-Gun

AU - Ryoo, Ryong

PY - 1992/12/1

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AB - Ruthenium was supported as a ruthenium-red complex ion on NaY zeolite by stirring the zeolite powder in an aqueous solution of RuCl3 containing ammonia at 350 K. The formation of a Ru cluster in the zeolite supercage due to the reduction of the Ru complex and subsequent growth of the Ru cluster upon heating in vacuum, H2, and O2 were studied by the measurement of xenon adsorption on Ru, the 129Xe NMR spectrum of the adsorbed xenon, the transmission electron micrograph, and the extended X-ray absorption fine structure of Ru. The results showed that very small Ru clusters consisting of ca. 20 Ru atoms on average can be obtained in the supercage due to the autoreduction of the supported ruthenium species during the evacuation of the sample under heating to 673 K, and the average number of Ru atoms per cluster gradually increased to 50 upon further heating to 823 K both in H2 and under vacuum. The xenon adsorption data indicated that the exposure of the 20-atom cluster to O2 resulted in much more severe increase of the cluster size than that caused by H2 and vacuum at the same temperature, e.g., increasing the average number of Ru atoms per cluster to 45 after the exposure to 1 atm of O2 at room temperature and resulting in the formation of large Ru agglomerates greater than 100 nm on the external surface of the zeolite crystal after exposure to O2 at 673 K.

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