Abstract
Infrared spectroscopy coupled with adsorption of probe molecules such as CO and NO was used to investigate the surface adsorption properties of reduced Ru and Ru−Pt/NaY catalysts. CO adsorption at room temperature on the monometallic catalyst yielded three main bands at 2145, 2088, and 2031 cm-1, which were assigned to CO bonded on Ru-oxidized species in close interaction with the support, a carbonyl cluster compound with Ru atoms highly coordinated with CO molecules, and CO linearly bonded on Ru0 particles, respectively. They were not thermally stable and moved around between 1843 and 1881 cm-1 as the temperature was increased. This new band was attributed to CO bonded in a bridge form on two Ru0 atoms, the metal being in a different dispersion state when compared to the just-reduced catalyst. The same three bands were observed for CO adsorption on the bimetallic catalyst, in addition to the 2074 cm-1 band, which was attributed to CO linearly bonded to Pt0. As the temperature was raised, no CO was bonded...
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