Patent ID: 7759281
Filing Date: 2010-07-20
Classification: B01J

Abstract:
1. A process for producing a photocatalyst containing metallic ultrafine particles which comprises bringing a substrate comprising fine particles having a photocatalytic function into contact with a metallic nanocolloid liquid that has previously been prepared by adding a reducing agent to a metallic salt solution and removing unreacted metallic salt and reducing agent after reaction completion, said metallic nanocolloid liquid being substantially free from a protective colloid formation agent, so that metallic nanocolloid particles are supported on the substrate having a photocatalytic function, wherein the fine particles having a photocatalytic function are made of anatase-type titanium dioxide, and wherein the concentration of the metallic nanocolloid particles in the metallic nanocolloid liquid is in a range of 40 to 3000 ppm by mass.