Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Patent
1990-11-23
1992-09-15
Shine, W. J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
252309, B01J 3102, B01J 3112, B01J 1300
Patent
active
051478412
ABSTRACT:
A method is provided for preparing catalytic elemental metal colloidal particles (e.g. gold, palladium, silver, rhodium, iridium, nickel, iron, platinum, molybdenum) or colloidal alloy particles (silver/iridium or platinum/gold). A homogeneous inverse micelle solution of a metal salt is first formed in a metal-salt solvent comprised of a surfactant (e.g. a nonionic or cationic surfactant) and an organic solvent. The size and number of inverse micelles is controlled by the proportions of the surfactant and the solvent. Then, the metal salt is reduced (by chemical reduction or by a pulsed or continuous wave UV laser) to colloidal particles of elemental metal. After their formation, the colloidal metal particles can be stabilized by reaction with materials that permanently add surface stabilizing groups to the surface of the colloidal metal particles. The sizes of the colloidal elemental metal particles and their size distribution is determined by the size and number of the inverse micelles. A second salt can be added with further reduction to form the colloidal alloy particles. After the colloidal elemental metal particles are formed, the homogeneous solution distributes to two phases, one phase rich in colloidal elemental metal particles and the other phase rich in surfactant. The colloidal elemental metal particles from one phase can be dried to form a powder useful as a catalyst. Surfactant can be recovered and recycled from the phase rich in surfactant.
REFERENCES:
patent: 3399145 (1968-08-01), Martinek et al.
patent: 4339345 (1982-07-01), Nakao et al.
patent: 4390514 (1983-06-01), Chianelli et al.
patent: 4425261 (1984-01-01), Stenius et al.
patent: 4593016 (1986-06-01), Amelio et al.
patent: 4842766 (1989-06-01), Blehm et al.
G. Boutonnet et al., "The Preparation of Monodisperse Colloidal Metal Particles From Microemulsions", Colloids and Surfaces, vol. 5, 1982, pp. 209-225.
M. Boutonnet et al., "Monodisperse Colloidal Metal Particles From Nonaqueous Solutions: Catalytic Behavior in Hydrogenation of But-1-ene of Platinum, Palladium, and Rhodium Particles Supported on Pumice", Journal of Catalysis, vol. 103, 1987, pp. 95-104.
J. Belloni et al., "Radiation Induced Preparation of Metal Catalysts: Iridium Aggregates", Nouveau Journal de Chimie, vol. 6, No. 11, pp. 507-509, 1982.
E. Amouyal et al., "Photochemical Production of Hydrogen From Water", Journal of Photochemistry, vol. 29, pp. 227-242, 1985.
J. Wilcoxon et al., "Formation of Metal Colloids in Inverse Micelles and Microemulsions", Proceedings of the Fall MRS, 1989.
Chafin James H.
McMillan Armand
Moser William R.
Shine W. J.
The United States of America as represented by the United States
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