Recovery of precious metal
AssigneeJohnson Matthey Public Limited Company
InventorDavid J. Stephenson
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Abstract
The invention relates to the recovery of precious metal lost from precious metal-containing catalysts for example the precious metal-containing catalysts which are used in the production of nitric acid by ammonia oxidation. In more detail, a getter (as herein defined) for recovery of precious metal lost from a precious metal-containing catalyst operating at elevated temperature comprises an agglomeration or assemblage of unwoven fibres made from a metal selected from the group ruthenium, palladium, iridium, platinum, gold, silver, rhodium and alloys containing one or more of the said metals. Preferably, the unwoven fibres are randomly oriented.
Claims21
A getter for recovery of precious metal lost from a precious metal-containing catalyst operating at elevated temperature which comprises a self-supporting or supported agglomeration or assemblage of unwoven, randomly oriented fibres of a length falling within the range of 1/2 to 4 inches, an irregular surface and made from a precious metal selected from the group consisting of ruthenium, rhodium, palladium, iridium, platinum, gold, silver and alloys containing one or more of the said metals, said fibres being produced by a melt extraction or melt spun process.
Dependencies are inferred from the claim text.