Pd/silica cluster catalysts: synthesis and reactivity with H2 and C2H4 |
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Authors: | Scott N Reifsnyder H Henry Lamb |
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Affiliation: | (1) Department of Chemical Engineering, North Carolina State University, Box 7905, 27695 Raleigh, NC, USA |
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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 100–150C. 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 320C absorb hydrogen on cooling in H2 to 30C; the resultant interstitial hydride species decompose in vacuo at 30C. Vacuum treatment at 300C 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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Keywords: | palladium catalysts metal clusters EXAFS spectroscopy hydride carbide |
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