Method for manufacture of catalyst composite having gold or mixture of gold with catalytic metal oxide deposited on carrier
AssigneesAgency of Industrial Science and Technology, Ministry of International Trade & Industry
InventorsMasatake Haruta, Hiroshi Sano, Tetsuhiko Kobayashi
Life of this patent
Estimating the term…
Abstract
A catalyst composite having gold or a mixture of gold with a catalytic metal oxide deposited on a carrier is produced by immersing a carrier in an aqueous solution containing a water-soluble salt of gold or water-soluble salts respectively of gold and other catalytic metal and urea and/or acetamide thereby allowing a precipitate to be deposited on the carrier and then firing the carrier holding the deposited precipitate thereon.
Claims14
A method for manufacturing a catalyst composite having gold deposited on a carrier, which comprises:
- (a) immersing a carrier in an aqueous solution of a mixture consisting of a water-soluble salt of gold and at least one member selected from the group consisting of urea and acetamide, thereby causing precipitation of gold or a precursor of gold or a combination thereof, and deposition thereof on the surface of the carrier;
- and
- (b) firing said carrier having said precipitate deposited thereon, and wherein the concentration of said water-soluble salt of gold in said aqueous solution is in the range of 5.times.10.sup.-3 M to 5.times.10.sup.-1 M and the concentrations of urea and acetamide therein are each in the range of 1.5 to 20 times the stoichiometric amount required for causing precipitation of metallic ions in said aqueous solution.
A method for manufacturing a catalyst composite having a composite of gold and a catalytic metal oxide deposited on a carrier, which comprises:
- (a) immersing a carrier in an aqueous solution of a mixture consisting of water-soluble salts of gold and a catalytic metal and at least one member selected from the group consisting of urea and acetamide, thereby causing precipitation of said composite or a precursor thereof or both, and deposition thereof on the surface of the carrier;
- and
- (b) firing said carrier having said precipitate deposited on the surface thereof and wherein the concentration of said water-soluble salt in said aqueous solution is in the range of 5.times.10.sup.-3 M to 5.times.10.sup.-1 M and the concentration of urea and acetamide therein are each in the range of 1.5 to 20 times the stoichiometric amount required for causing precipitation of metallic ions in said aqueous solution.
Dependencies are inferred from the claim text.