Abstract
Ru 3(CO) 12 adsorbed on hydrated Al 2O 3 is transformed under the action of atomspheric oxygen into an anchored mononuclear dicarbonylic species (Ru B). In the absence of O 2, OH groups of the surface act as oxidizing agents at T > 373 K leading to a variety of oxidized species, whose structure and relative concentration depend upon the treatment conditions. In vacuo and in the temperature range 673-423 K, dicarbonylic Ru A, Ru B, and Ru C anchored species characterized by well-defined ir bands at 2138-2075, 2072-2005, 2054-1977 cm −1, respectively, are prevalently formed. At higher temperature the decarbonylation is complete but the ruthenium is prevalently in an oxidized form. Decarbonylation in a flow of hydrogen favours the formation of Ru C species at intermediate temperatures and of metallic ruthenium at the highest temperatures.
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