Abstract
Reduction of aqueous salt solutions of gold, silver, copper and platinum group metals were studied. Shapes and particle size distributions of the powders varied among metal species and with reduction conditions. In cases with hydrogen reduction, gold and copper powders were composed of single crystals a few microns in diameter. Silver and palladium powders obtained were irregular in shape and the particles were apt to aggregate, whereas platinum powder had spherical particles 0.5-3μm in diameter.
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