Recovery of PT/RH from car exhaust catalysts

Details Recovery of PT/RH from car exhaust catalysts Recovery of PT/RH from car exhaust catalysts

1975-05-29

1976-10-12

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Platinum group metal

75102, 75114, 75121, 252415, C01G 5500

Patent

active

039858545

ABSTRACT:
In order to recover platinum, rhodium and other precious metals from catalysts employed in internal combustion engine exhaust systems, the used or unused catalysts, preferably in crushed, powdered or broken form, are reacted with an acidic medium having oxidizing properties to leach out the precious metals. The acidic medium may be an acid containing or oxidizing agent or an oxidizing acid and when a used catalyst is treated the leaching step is preferably preceded by a reduction step in order to convert to the metal any precious metal oxides present in the catalyst.

REFERENCES:
patent: 2344208 (1944-03-01), Kirkpatrick
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patent: 2830877 (1958-04-01), Appell
patent: 2863760 (1958-12-01), Ashley et al.
patent: 3488144 (1970-01-01), Sargent
patent: 3660306 (1972-05-01), Sennewald et al.
patent: 3694376 (1972-09-01), Kalrisch et al.
patent: 3876747 (1975-04-01), Pittie et al.

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