Patent ID: 6423331
Filing Date: 2002-07-23
Classification: A01N,A61K,A61L,A61Q,B01J,C01B,C01P,C08K,Y10S

Abstract:
Pyrogenically prepared silica doped with silver or silver oxide, comprising silica prepared pyrogenically by flame oxidation or flame hydrolysis,wherein said silica is doped with a doping component in an amount from 0.0001 wt. % to 20 wt. %, the doping component being selected from the group consisting of silver salts, silver salt mixtures, suspension of a silver compound, suspension of metallic silver and mixtures thereof wherein said doping component is prepared as a solution or suspension and mixed, as an aerosol, with a gas used for flame oxidation or flame hydrolysis, and the resultant mixture of aerosol and gas is fed into a flame in which a pyrogenic silica is prepared by flame oxidation or flame hydrolysis wherein the BET surface area of the doped silica is from 1 to 600 m2/g.