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

A limpid, colorless, inflammable liquid from the slow oxidation of alcohol under the influence of platinum black.

From Project Gutenberg

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 Project Gutenberg

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 Project Gutenberg

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

From Project Gutenberg

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 Project Gutenberg