Abstract
Infrared spectra were obtained for NO and CO adsorbed on reduced and oxidized Ru supported on silica. Adsorption of NO on a fully reduced sample produced bands at 1810 and 1860 cm −1. With prolonged catalyst exposure to NO, the latter band shifted to higher frequencies. Spectra of NO adsorbed on an oxidized sample showed only a single band at 1880 cm −1. Both the band at 1810 cm −1 and that occurring between 1860 and 1880 cm −1 are assigned to NO adsorbed as NO +. The low frequency band is associated with adsorption on partially oxidized Ru sites and the high frequency band with adsorption on more fully oxidized sites. On a fully reduced sample, CO adsorption produced a single band at 2040 cm −1 which is assigned to linearly bonded CO. Oxidation of Ru and subsequent adsorption of CO produced bands at 2130 and 2070 cm −1. This pair of bands is assigned to the symmetric and asymmetric stretches of two CO molecules bonded to a single oxidized Ru site.
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