| Abstract
| - The structural and catalytic properties of SiO2- and TiO2-supported Pt−Au bimetallic catalysts prepared bycoimpregnation were compared with those of samples of similar composition synthesized from a Pt2Au4(C⋮CBut)8cluster precursor. The smallest metal particles were formed when the bimetallic cluster was used as a precursor andTiO2 as the support. FTIR data indicate that highly dispersed Au crystallites in these samples, presumably locatedin close proximity to Pt, are capable of linearly coordinating CO molecules with a characteristic vibration observedat 2111 cm-1. The cluster-derived Pt2Au4/TiO2 samples were the only ones exhibiting low-temperature CO oxidationactivity, indicating that both the high dispersion of Au and the nature of the support are important factors affectingthe catalytic activity for this system.
|
