Abstract
Ion-exchange of Pt(NH 3) 2+ 4 produces more highly dispersed platinum on silica than impregnation. For the first time, the kinetics of formation of Pt(NH 3) 2+ 4 are shown to be rather slow. The ion-exchange process at high pH involves a decrease in pH, a drop in concentration of platinum in solution, but an increase in silicon solution concentration as the silica undergoes dissolution. The latter process affects the total surface area and probably the dispersion and properties of the final platinum particles on the silica surface.
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