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Infrared Study of Co Adsorbed Species On Ru/Silicalite Catalyst

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Carbon monoxide adsorbed species on Ru/silicalite and their reactivity towards oxygen have been studied using in situ diffuse reflectance infrared spectroscopy (DRIFT). Four species were detected: a bridge bonded CO on metallic Ru (1980 cm-1), a linearly adsorbed CO on metallic Ru (2040 cm-1), a linearly adsorbed CO on partially oxidized Ru (2081 cm-1), and a multicarbonyl on oxidized Ru (2081 and 2133 cm-1). Among the four CO species the most strongly held species was the bridge bonded CO on metallic Ru while the multicarbonyl was the most weakly held species. These four species have different reactivities towards oxygen. Only the linearly adsorbed CO on metallic Ru can be oxidized at room temperature.

Affiliations: 1: Department of Chemical Engineering and CERPIC, Université Laval, Québec, Canada GIK 7P4


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