Abstract
FT-IR spectra of the co-adsorption of benzene and CO have been performed to identify the preferred adsorption sites of hydrogen and benzene on a Pt/SiO 2 catalyst for hydrogenation of benzene. Results of CO adsorbed on atop sites on Pt/SiO 2 includes: an a peak at 2091 cm -1 , a β peak at 2080 cm -1 and a y peak at 2067 cm -1 indicating three kinds of adsorption sites for dissociative hydrogen on Pt/SiO 2 . The site of lowest CO stretching frequency offers stronger adsorbates-metal interaction for benzene and hydrogen. Hydrogen binding on the site of lowest CO stretching frequency before benzene adsorption significantly enhances the reaction rate of benzene hydrogenation.
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