COLL 199 |
| P. K. Babu, Hee Soo Kim, Andrzej Wieckowski, and Eric Oldfield. Department of Chemistry, University of Illinois, Urbana, IL 61801 |
| Pt/Pd nanoparticle catalysts with superior reactivity towards formic acid oxidation were produced by spontaneous deposition of Pd on Pt. Electrochemical nuclear magnetic resonance measurements were carried out on the CO chemisorbed on these catalysts. Deconvolution of the broad 13C NMR spectrum yielded two peaks that could be assigned to CO adsorbed on Pt and Pd sites. Analysis of the NMR data proved that the 5σ orbital of CO is important in its chemisorption on Pd atoms, which agrees with the theoretical predictions. Interaction of Pd with Pt lead to a reduction in the Fermi level local density of states (Ef-LDOS) at the Pd sites. Consequently, the CO adsorption became weaker. The bond between CO and Pt sites was stronger than that of CO on pure Pt due to increased Ef-LDOS. The excellent reactivity of this Pt/Pd catalyst suggests that formic acid oxidation occurs predominantly via the direct dehydrogenation path. |
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Posters: Fundamental Research in Surface and Colloid Chemistry
6:00 PM-8:00 PM, Monday, March 29, 2004 Disneyland -- North Exhibit Hall, Poster
Division of Colloid and Surface Chemistry |