platinum black

noun

Chemistry.

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

platinum black

noun

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

Word History and Origins

Origin of platinum black¹

First recorded in 1850–55

Example Sentences

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

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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.

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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.

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

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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.

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