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- W2076393647 abstract "Supported clusters represented as Ir4on γ-Al2O3were prepared by treatment of γ-Al2O3-supported [Ir4(CO)12] in He at 300°C. The clusters were decarbonylated with near retention of the tetrahedral cluster frame, as indicated by extended X-ray absorption fine structure (EXAFS) spectra determining a first-shell Ir–Ir coordination number of 3.04 with a distance of 2.682 Å. X-ray absorption near-edge structure data characterizing the catalysts and Ir metal indicate the electron deficiency of the supported clusters, and the EXAFS data indicate an Ir–O distance of about 2.1 Å, which is consistent with bonding of cationic Ir in the clusters to oxygen of the support. The supported Ir4clusters were found to be catalytically active for the structure-insensitive toluene hydrogenation at temperatures in the range 60 to 100°C, with the activity being almost the same as that of Ir6/γ-Al2O3and an order of magnitude less than that of Ir aggregates of about 50 atoms each, on average, supported on γ-Al2O3. The Ir4/γ-Al2O3catalyst was stable in operation in a flow reactor, and, consistent with this observation, EXAFS results characterizing the used catalyst indicated that the cluster nuclearity was essentially unchanged after catalysis. The low activity of the supported Ir4clusters relative to that of metallic Ir particles indicates that the concept of structure insensitivity is no longer valid for clusters as small as Ir4on the metal oxide support." @default.
- W2076393647 created "2016-06-24" @default.
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- W2076393647 date "1997-05-01" @default.
- W2076393647 modified "2023-10-16" @default.
- W2076393647 title "Toluene Hydrogenation Catalyzed by Tetrairidium Clusters Supported on γ-Al2O3" @default.
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- W2076393647 doi "https://doi.org/10.1006/jcat.1997.1610" @default.
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