Catalyst preparation

Details Catalyst preparation Catalyst preparation

1995-07-13

1997-12-02

Caldarola, Glenn A.

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating is discontinuous single metal or alloy layer

205173, 427304, 427305, 427437, 502439, C25D 1104, B01J 2104

Patent

active

056932073

ABSTRACT:
A substrate metal such as aluminum or titanium, usually in the form of a web, is anodized to form a porous unsealed oxide coating. An inexpensive core metal such as copper or chromium is then electrodeposited in the pores of the oxide coating to form metal nodules extending above the oxide coating in a bulbous, undercut configuration. A second metal, usually an expensive catalytic metal, is deposited onto the surface of the core metal nodules by electro or chemical deposition. A large surface area of catalyst is formed with the use of a minimum amount of catalyst metal. The nodules may be liberated from the substrate metal surface by dissolving the oxide layer and releasing discrete particles to form a fine catalyst powder.

REFERENCES:
patent: 3764564 (1973-10-01), Maselli et al.
patent: 3929594 (1975-12-01), Fromson
patent: 4014756 (1977-03-01), Fromson
patent: 4021592 (1977-05-01), Fromson
patent: 4954370 (1990-09-01), Mahmoud
patent: 4994422 (1991-02-01), Goldman
patent: 5380696 (1995-01-01), Sawada et al.

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