An Infrared Study of Alumina- and Silica-Supported Ruthenium Cluster Carbonyls Full article
Journal |
Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694 |
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Output data | Year: 1980, Volume: 65, Number: 2, Pages: 374-389 Pages count : 16 DOI: 10.1016/0021-9517(80)90315-2 | ||||
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Funding (2)
1 | United States Department of Energy | W-7405ENG-48 |
2 | National Science Foundation | 78-18989-Bell-ZF-04/80 |
Abstract:
An investigation has been performed of the adsorption of Ru3(CO)12, α-H4Ru4(CO)12, and Ru6C(CO)17 on
γ-Al2O3 and SiO2, and of the structures formed upon decomposition of the initially supported clusters. The extent of Ru3(CO)12 adsorption on γ-Al2O3 strongly depends on the temperature at which the support had been dehydroxylated. Infrared spectra of alumina-supported Ru3(CO)12 suggest that the cluster is adsorbed as a result of interactions between the carbonyl ligands and hydroxyl groups and Lewis acid sites present on the support surface. Similar interactions are proposed for alumina-supported α-H4Ru4(CO)12 and Ru6C(CO)12. Decomposition of the supported clusters produces three surface structures, independent of the original cluster composition. The first structure is characterized by bands at 2045–2050 and 1965–1970 cm−1 and is represented by [Ru(CO)2X2]n. The second and third structures are characterized by bands at 2130–2140, 2060–2070, and 1990–2000 cm−1 and are represented by [Ru(CO)3X2]nand [Ru(CO)4X2]n, respectively. In each of the structures X represents an oxygen atom of the alumina lattice. The nuclearity of the surface structures, n, cannot be defined from the present studies. Complete decarbonylation of the Ru surface structures induces a stronger Ru-support interaction, which may lead to the entry of Ru ions into the support lattice and the formation of surface aluminates. The aluminates are not stable, however, and the initial three structures can be regained by heating in CO. Upon reduction of the supported clusters in H2 at temperatures above 400 °C, Ru microcrystallites appear to be formed. These particles are not stable and the Ru is redispersed into smaller units if the sample is heated in CO above 200 °C. By contrast with γ-Al2O3, the interactions of Ru2(CO)12 with SiO2 are very weak. As a consequence Ru microcrystallites are formed when the supported cluster is reduced in H2 at temperatures above 400 °C.
Cite:
Kuznetsov V.L.
, Bell A.T.
, Yermakov Y.I.
An Infrared Study of Alumina- and Silica-Supported Ruthenium Cluster Carbonyls
Journal of Catalysis. 1980. V.65. N2. P.374-389. DOI: 10.1016/0021-9517(80)90315-2 WOS Scopus РИНЦ
An Infrared Study of Alumina- and Silica-Supported Ruthenium Cluster Carbonyls
Journal of Catalysis. 1980. V.65. N2. P.374-389. DOI: 10.1016/0021-9517(80)90315-2 WOS Scopus РИНЦ
Dates:
Submitted: | Sep 26, 1979 |
Accepted: | Mar 24, 1980 |
Published print: | Oct 1, 1980 |
Published online: | May 24, 2004 |
Identifiers:
Web of science | WOS:A1980KM65300014 |
Scopus | 2-s2.0-84985634383 |
Elibrary | 22579974 |
Chemical Abstracts | 1980:647618 |
Chemical Abstracts (print) | 93:247618 |
OpenAlex | W1976245664 |