Pt/Pd nanoparticle catalysts with superior reactivity towards formic acid oxidation were produced by spontaneous deposition of Pd on Pt. Deconvolution of the broad C NMR spectrum yielded two peaks that could be assigned to CO adsorbed on Pt and Pd sites. The 5δ orbital of CO was important in its chemisorption on Pd atoms, which agreed with the theoretical predictions. Interaction of Pd with Pt led to a reduction in the Fermi level local density of states (Ef-LDOS) at the Pd sites. 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 suggested that formic acid oxidation occurs predominantly via the direct dehydrogenation path. This is an abstract of a paper presented at the 227th ACS National Meeting (Anaheim, CA 3/28/2004-4/1/2004).
ASJC Scopus subject areas
- Chemical Engineering(all)