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| - Propene Hydrogenation Catalyzed by γ-Al2O3-Supported Ir4Clusters: Inhibition by Dehydrogenated PropeneDerivatives on Ir4
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| - Ir4 clusters supported on MgO and on γ-Al2O3 were prepared from supported [Ir4(CO)12] and used ascatalysts for hydrogenation of propene. Extended X-ray absorption fine structure spectra of the workingcatalysts identify the Ir4 clusters themselves as the catalytically active species. Infrared spectra of Ir4/γ-Al2O3 during catalysis indicate propylidyne and highly dehydrogenated propene derivatives (approximatedas C3H2 and C2H) bonded to the clusters; they are inhibitors of catalysis and not reactive intermediates.Infrared spectra also show that the formation of propylidyne and highly dehydrogenated propene derivativesis greatly reduced when the Ir4 clusters are supported on MgO instead of γ-Al2O3. The results suggest thatthe more basic MgO support is a better electron donor to the clusters than γ-Al2O3, causing the strengthof the interaction between the clusters and propene to be less for Ir4/MgO than for Ir4/γ-Al2O3.
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