Interactions of CO and O2 with Ir(110)Surfaces
Open Access
- 1 July 1973
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 28 (7) , 1144-1148b
- https://doi.org/10.1515/zna-1973-0717
Abstract
LEED/Auger studies with Ir(110) revealed that the clean surface is reconstructed to a 1X2- structure, whereas the normal 1X1-structure can be stabilized by small amounts of carbon impurities. Carbon monoxide adsorbs with a mean heat of adsorption of 37 kcal/mole and forms a 2X1- structure without affecting the substrate "extra" diffraction spots. Adsorbed oxygen forms 2X2- and c2X2-structures, whereby the diffraction features of the 1X2-structure disappear indicating that oxygen atoms cause place exchange process of the Ir surface atoms which is not the case with adsorbed CO. Carbon monoxide tends to dissociate at elevated temperatures. The catalytic oxidation of CO proceeds in a manner similar to that found with Pd and Pt surfaces.Keywords
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