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Cyanide leaching of gold catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
50213 46784 2015 3 PDF Available
Title
Cyanide leaching of gold catalysts
Abstract

•Cyanide leaching of gold catalysts can remove less active gold.•Gold thrifting is thereby enabled for the chosen system investigated.•Cyanide leaching may be selective and may help in gold speciation studies.•Cyanide leaching leads to a modification of gold oxidation state.

Gold catalysts remain of great interest, but a high gold price presents a concern. Gold can be leached from gold–titania catalysts using alkaline cyanide solutions. The specific activity of gold for CO oxidation can thereby be increased substantially, though the precise nature of the gold before and after treatment remains unclear. It seems unlikely that leaching proceeds in a simple manner by selective dissolution of metallic gold particles. Rather it is likely that cyanide ions interact with gold centers in several ways and, in addition, alkali metal ions may also modify activity.

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Keywords
Gold; Titania; Cyanide; Leaching; CO oxidation; Thrifting
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Cyanide leaching of gold catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 67, 5 July 2015, Pages 87–89
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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