Leached nanocrystalline materials process for manufacture of the

Details Leached nanocrystalline materials process for manufacture of the Leached nanocrystalline materials process for manufacture of the

1997-01-24

1999-02-16

Wood, Elizabeth D

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502335, 502 2, 502523, 502527, 75300, 75352, 148 332, 148336, 148426, 204290R, 204290F, 204293, 429 40, 429 44, 420900, B01U 2358, B22F 100, C22C 3808, H01M 486

Patent

active

058720740

ABSTRACT:
Leached nanocrystalline materials having a high specific surface are particularly useful for storing hydrogen or as catalysts or electrocatalysts in the manufacture electrodes, especially for fuel cells. Such materials can be manufactured by preparing a nanocrystalline material consisting of a metastable composite or alloy of at least two different chemical elements. To be nanocrystalline, this material must have a crystalline structure with the grain size lower than 100 nm. Then, the so prepared nanocrystalline material can be subjected to a leaching treatment in order to eliminate partially or totally one of the elements of the composite or alloy. This leaching results in nanocrystalline materials having a porous structure and, thereby, the requested high specific surface.

REFERENCES:
patent: 5433797 (1995-07-01), Erb et al.
Chen Y et al. "Production of Rutile from Ilmenite by Room Temperature Ball-Milling-Induced Sulphurisation Reaction", Journal of Alloys and Compounds, vol. 245, No. Jan. 2, pp. 54-58.
Jackson, E. "Hydrometallurgical Extraction and Reclamation", Ellis Horwood Ltd., England, 1986, pp. 56-73 and 190-197.
Ivanov E. et al. "Structural and Magnetic Properties of Non-Equilibrium B.C.C. Nickel Prepared by Leaching of Mechanically Alloyed NI35AL65", Journal of Alloys and Compounds, vol. 185, no. 1, pp. 25-34.
Database WPI, Section Ch, Week 9514, Derwent Publications Ltd., London, GB; Class A41, AN 95-101179 (Abstract of JP 7-024318A (Jan. 27, 1995)).

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