Catalytic structure
AssigneeAlloy Surfaces Company, Inc.
InventorsAlfonso L. Baldi, Victor V. Damiano
Life of this patent
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Abstract
Foil, wire and similar coherent bodies of catalytic metal are provided with catalytically active surfaces by diffusing a chemically removable metal such as aluminum or zinc into those surfaces and then selectively dissolving out at least about a third of the removable metal. Platinum wire screens activated in this way make effective exhaust catalysts for automotive engines.
Claims13
A self-supported coherent structure essentially of metal selected from the class consisting of a platinum family metal and nickel, having its surface in the form of a three-dimensional micro-fissured fragmentation into cells principally ranging from about 500 Angstroms to about 5000 Angstroms in size and produced by dissolving out from that surface a different metal introduced into that surface by activated pack diffusion.
In the preparation of a highly active platinum catalyst, the improvement according to which aluminum is diffused into the platinum by activated pack diffusion, and the aluminum-containing platinum has at least about one-third of its aluminum leached out by a first treatment with aqueous caustic and a second treatment with aqueous acid.
A stirrer propeller whos surface is nickel catalytically activated by first diffusing into it a chemically leachable alloying metal and then chemically leaching at least about a third of that leachable metal.
Dependencies are inferred from the claim text.