COLL 174 |
| Robert W. J. Scott, Orla M. Wilson, and Richard M. Crooks. Department of Chemistry, Texas A&M University, College Station, TX 77843-3255 |
| We report the synthesis, characterization, and catalytic activity of bimetallic dendrimer-encapsulated nanoparticles (DENs). These materials are prepared by co-complexation of different ratios of metal salts with interior tertiary amines of poly(amidoamine) (PAMAM) dendrimers, followed by chemical reduction, or alternatively by deposition of a second metal onto metallic DEN seeds. EDS results indicate that the percentage composition of the individual bimetallic DENs is consistent with the metal composition in the original synthesis. Catalytic studies of these homogeneous catalysts show that the hydrogenation rate of allyl alcohol is enhanced in the presence of the bimetallic nanoparticles compared to monometallic DENs. These results are important because they provide a means for preparing nearly monodisperse bimetallic catalysts under easily controlled conditions. In addition, dendrimer templates offer the possibility of multi-step sequential design of DEN catalysts that allows for the synthesis of a large range of bimetallic and multimetallic architectures with tunable catalytic properties. |
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The Science and Engineering of Catalyst Preparation
2:00 PM-5:25 PM, Monday, March 29, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |