CHARACTERIZATION OF PRECIOUS METAL PARTICLES PREPARED USING CHITOSAN AS A PROTECTIVE AGENT

Precious metal particles (Au, Pt, Pd, Rh) were prepared using chitosan as a protective agent. The particle sizes decreased with increasing amounts of chitosan, while the dispersion stability against electrolyte increased. Similarly, stable bimetallic particles of Au-Pd and Au-Rh were obtained and their particle sizes were almost independent of feed composition. Furthermore, these bimetallic particles exhibited characteristic properties for the decomposition of hydrogen peroxide and hydrogenation of methylvinylketone.