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US 4,069,040 AGranted
Method for recovery of platinum and iridium from catalysts
AssigneeRhone-Poulenc Industries
InventorsMaryvonne Thomas, Jean Grosbois
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Abstract
The invention relates to the recovery of the constituent elements of catalysts containing precious metals, such as platinum and iridium deposited on aluminous supports. This recovery is accomplished by a substantially total solubilization of the catalysts by means of hydrochloric acid and by extraction, for example by means of ion exchange resins. This system allows for a good separation of the platinum and the iridium.
Claims12
A method for the recovery of constituents of catalysts containing platinum and iridium on an aluminous support, comprising the steps of
- a. attacking the catalyst with a 3-9 M hydrochloric acid solution to dissolve alumina, platinum and iridium,
- b. adding to the solution a sufficient quantity of reducing agent to convert dissolved iridium to the trivalent state,
- c. passing the solution into contact with an anion exchange medium on which platinum becomes strongly fixed leaving alumina and iridium in solution,
- d. adding an oxidizing agent to the solution from (c) to convert trivalent iridium to the tetravalent state,
- e. passing the solution into contact with an anion exchange medium on which the iridium becomes strongly fixed.
2 more elements
Dependencies are inferred from the claim text.