platinum black

American  

noun

Chemistry.

1. a black powder consisting of very finely divided metallic platinum, used as a catalyst, especially in organic synthesis.

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platinum black British  

noun

1. chem a black powder consisting of very finely divided platinum metal. It is used as a catalyst, esp in hydrogenation reactions

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Etymology

Origin of platinum black

First recorded in 1850–55

Example Sentences

See Examples For:

platinum black

The View comes in active black, sage green, and lavender dream, while the Charge 5 is available in steel blue / platinum, black / graphite, and lunar white / gold.

From The Verge ● Oct. 13, 2021

If the plates be covered with a deposit of platinum black, in which the gases are absorbed as fast as they are produced, the minimum decomposition point is 1.07 volt, and the process is reversible.

From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" by Various

Acetylene combines with hydrogen in the presence of platinum black, and ethylene and then ethane result.

From Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power by Leeds, F. H. (Frank Henley)

Both sides of this diaphragm are covered with very fine platinum leaf perforated with very numerous small holes, and over this a thin film of platinum black.

From Scientific American Supplement, No. 717, September 28, 1889 by Various

This is important, as if the platinum black becomes wet, it loses its absorbing power for the gases almost completely and stops the work of the battery.

From Scientific American Supplement, No. 717, September 28, 1889 by Various