Volcano relationships in metal cluster catalysis: An infrared spectroscopic monitor of site character |
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| Authors: | Peter B Wells David Jackson and Robin Whyman |
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| Institution: | (1) Department of Chemistry, University of Hull, HU6 7RX Hull, UK;(2) Synetix, P.O. Box 1, TS23 1LB Cleveland, Billingham, UK;(3) Department of Chemistry, University of Liverpool, P.O. Box 147, L69 3BX Liverpool, UK |
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| Abstract: | Active osmium cluster catalysts (derived from Os3(CO)12, H2Os3(CO)10, H4Os4(CO)12, Os6(CO)18 and H2Os10C(CO)24 supported on silica, alumina, titania, and ceria) contain, in their infrared spectra, a band in the region 1930–1985 cm−1 that is characteristic of the cluster/support combination. The activities of these catalysts for reactions of hydrogen with
ethene, carbon monoxide, carbon dioxide, and ethane, relate to their characteristic CO stretching frequencies, giving ‘volcano’
curves. Evidence from ethene hydrogenation kinetics confirms that the characteristic CO-frequency is a monitor of strength
of adsorption at the catalytically active site.
Dedicated to Professor Pál Tétényi on the occasion of his 70th birthday |
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| Keywords: | Osmium clusters carbonyl clusters volcano relationship site character infrared monitor ethene hydrogenation CO hydrogenation CO2 hydrogenation ethane hydrogenolysis |
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