Wäßrige Edelmetallkolloide und ihre Verwendung

摘要

Aqueous precious metal colloids in the form of a sol with metal particles of 0.5-100 nm containing more than 10 mmol precious metal per litre of sol. Said colloids can be obtained by reduction of a precious metal salt or complex dissolved in water by using an organic reducing agent in the presence of a water-soluble polymer and optionally in the presence of multivalent anions. The aqueous precious metal colloids can be used to produce catalysts with a precious metal support by bringing said colloids into contact with a catalyst support, whereby the precious metal is spontaneously absorbed onto said support.