colloidal dispersion, method of making a colloidal dispersion and catalyst

摘要

The present invention relates to colloidal dispersions comprising a plurality of precious group nanoparticles, wherein about 90% or more of the precious group metal is in fully reduced form; a dispersion medium comprising a polar solvent; a water soluble polymer suspension stabilizing agent; and a reducing agent, wherein the nanoparticle concentration is at least about 2% by weight of the colloidal dispersion, wherein the nanoparticles have an average particle size of about 1 to about 6 nm and at least 95% of the Nanoparticles have a particle size within this range, and additionally wherein the colloidal dispersion is substantially free of halogen compounds, alkali metals, alkaline earth metals and sulfur. Methods for preparing, further processing and using such colloidal dispersions are also provided herein.