Method for preparing dispersions of precious metal...

B - Operations – Transporting – 01 – J

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B01J 13/00 (2006.01) B22F 9/24 (2006.01)

Patent

CA 2711790

The present invention is directed to a method for preparing colloidal dispersions of precious metal nanoparticles selected from the group consisting of Pt, Au, Pd, Ag, Rh, Ru and mixtures or alloys thereof, and to a method for isolating such precious metal nanoparticles from these colloidal dispersions. The colloidal dispersions are prepared by reducing suitable precious metal precursor compounds in aqueous alkaline solutions at reaction temperatures between 40 and 70°C and a pH >= 12.0 in the presence of polysaccharides with average molecular weights (M w) in the range of 300.000 to 1.000.000. The precious metal nanoparticles are isolated after decomposing the polysaccharide by heating the colloidal dispersions to temperatures > 80°C. The nanoparticles can be used for the manufacture of core/shell-type catalyst materials and for electronic, decorative and medical ap-plications.

La présente invention concerne un procédé pour préparer des dispersions colloïdales de nanoparticules de métaux précieux choisies dans le groupe consistant en Pt, Au, Pd, Ag, Rh, Ru et leurs mélanges ou alliages, et un procédé pour isoler de telles nanoparticules de métaux précieux de ces dispersions colloïdales. Les dispersions colloïdales sont préparées en réduisant des composés précurseurs de métaux précieux appropriés dans des solutions alcalines aqueuses à des températures de réaction comprises entre 40 et 70 °C et à un pH = 12,0 en présence de polysaccharides de masses moléculaires moyennes (M w) dans la gamme de 300 000 à 1 000 000. Les nanoparticules de métaux précieux sont isolées après décomposition du polysaccharide par chauffage des dispersions colloïdales à des températures > 80°C. Les nanoparticules peuvent être utilisées pour la fabrication de matériaux de catalyseur de type noyau/carapace et pour des applications électroniques, décoratives et médicales.

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