Amine containing polymeric microspheres such as polyvinyl pyridine are complexed with metal salts or acids containing metals such as gold, platinum or iron. After reduction with sodium borohydride, the salt is reduced to finely divided free metal or metal oxides, useful as catalysts. Microspheres containing...http://www.google.fr/patents/US4197220?utm_source=gb-gplus-shareBrevet US4197220 - Impregnated metal-polymeric functional beads
