Synthesis of a Supported Metal Catalyst Using Nanometer-Size Clusters

✍ Scribed by Li-Chih Chao; Ronald P. Andres

• Book ID: 102970122
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 507 KB
• Volume: 165
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1994.1231

✦ Synopsis

A new method for synthesis of supported metal catalysts is described. The steps in this method are: (1) production of nanometer diameter metal clusters by gas aggregation, (2) capture and stabilization of the clusters as a colloidal suspension in an organic solvent, (3) adsorption of the clusters onto a high-surface-area support, (4) removal of the support particles from the solvent, and finally (5) oxidation/reduction treatment to remove residual solvent and surfactant. (\mathrm{Ag} / \mathrm{Si(} \mathrm{O}_{2}) calalysts with controlled (\mathrm{Ag}) cluster diameters of (2.4,4.4,5.2,8), and (1 \mathrm{~nm}) were produced by this method. The size distribution of the clusters as characterized by transmission electron microscopy is essentially constant from step 1 to step 5. O 1994 ^cademic Press, Inc.