ISSN:
1573-9171
Keywords:
carbonyl clusters, silica gel, propylene, hydroformylation
;
IR spectroscopy
;
Mössbauer spectroscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Chemical transformations of SiO2-supported [Fe5RhC(CO)16]− and [Fe4RhC(CO)14]− clusters in Ar, CO, and synthesis gas are studied by IR spectroscopy, Mössbauer spectroscopy, and transmission electron microscopy. It is shown that partial transformation of the [Fe5RhC(CO)16]− cluster to the [Fe4RhC(CO)14]− cluster occurs immediately after its deposition on the substrate surface with the simultaneous formation of Fe2+ ions. The complete conversion of the supported [Fe5RhC(CO)16]− cluster to [Fe4RhC(CO)14]− is observed at 323 K in the synthesis gas. At 373 to 423 K [Fe5RhC(CO)16]− transforms into a mixture of Fe4Rh2C(CO)16, [Fe4RhC(CO)14]−, and [Fe53Rh3C(CO)15]− clusters. In the 523 to 623 K range, the supported [Fe5RhC(CO)16]− cluster decarbonylates completely to form bimetallic species Å 5 Å in size. Silica-supported FeRh clusters are active in propylene hydroformylation at 423 to 473 K and form a mixture of butyl alcohols and butyraldehydes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00698489
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