The effect of particle size in the adsorption of carbon monoxide on iridium: An infrared investigation

The effect of a varying particle size on the infrared absorption band frequency of CO adsorbed on Ir Al 2O 3 has been investigated. The experimentally observed increase of the frequency with increasing particle size is ascribed to a weaker electron exchange of CO with the metal. This picture is conf...

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Bibliographic Details
Published in:Journal of catalysis 1983-01, Vol.82 (1), p.35-44
Main Authors: Toolenaar, F.J.C.M., Bastein, A.G.T.M., Ponec, V.
Format: Article
Language:English
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Summary:The effect of a varying particle size on the infrared absorption band frequency of CO adsorbed on Ir Al 2O 3 has been investigated. The experimentally observed increase of the frequency with increasing particle size is ascribed to a weaker electron exchange of CO with the metal. This picture is confirmed by hydrogen and carbon monoxide adsorption measurements. By use of the isotopic dilution method, other possible effects, such as a varying dipole-dipole coupling, an electronic influence of the carrier, or electronic structure changes due to a varying metal particle size, could be discarded as possible explanations.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(83)90115-X