Method for production of ultra-fine gold particle-immobilized oxides
AssigneesAgency of Industrial Science and Technology, Ministry of International Trade & Industry
InventorsMasatake Haruta, Tetsuhiko Kobayashi, Susumu Tsubota, Yoshiko Nakahara
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Abstract
An ultra-fine gold particle-immobilized oxide is produced by a method which comprises adding an alkali compound to an aqueous solution containing a gold compound and a water-soluble metal salt thereby giving rise to a coprecipitate in the aqueous solution, separating the coprecipitate from the aqueous solution, and calcining the separated coprecipitate. This method is characterized by allowing the presence of a carboxylic acid or a carboxylate in the aqueous solution from the beginning or after the occurrence of the coprecipitate.
Claims20
A method for the production of an ultra-fine gold particle-immobilized oxide, which method essentially consists of neutralizing an aqueous solution containing as substantially main components thereof a gold compound and a water-soluble metal salt by the addition of an alkali compound thereby giving rise to a coprecipitate, then adding to the resultant coprecipitate-containing aqueous solution at least one carboxylic acid compound selected from the group consisting of carboxylic acids and salts of said carboxylic acids and separating said coprecipitate from said aqueous solution, and heating the separated coprecipitate.
A method for the production of an ultra-fine gold particle-immobilized oxide, which method essentially consists of neutralizing an aqueous solution containing as substantial main components a gold compound, a water-soluble metal salt, and at least one carboxylic acid compound selected from the group consisting of carboxylic acids and salts of said carboxylic acids by the addition of an alkali compound thereby giving rise to a coprecipitate, separating said coprecipitate from said aqueous solution, and calcining the separated coprecipitate.
Dependencies are inferred from the claim text.