Abstract
Silica-supported Pd clusters were characterized by in situ EXAFS spectroscopy. Clusters with an average nuclearity of six atoms were derived from either an inorganic or an organometallic precursor by reduction at 100–150‡C. Despite the small size of the clusters, EXAFS contributions from the metal-support interface were not detected. These clusters and larger ones formed by reduction at 320‡C absorb hydrogen on cooling in H2 to 30‡C; the resultant interstitial hydride species decompose in vacuo at 30‡C. Vacuum treatment at 300‡C removes chemisorbed H2 yielding bare Pd clusters. In contrast to larger crystallites, the Pd clusters do not react with C2H4 at 150‡ to form interstitial carbide species.
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