Recovery of platinum, tin and indium from spent catalysts in chloride medium using strong basic anion exchange resins
2011
Marinho, Roberta Santos | Silva, Cristiano Nunes da | Afonso, Julio Carlos | Cunha, José Waldemar Silva Dias da
This work describes a route for platinum recovery from spent commercial Pt and PtSnIn/Al₂O₃ catalysts using strong basic mesoporous and macroporous anion exchange resins (Cl⁻ form). The catalysts were leached with aqua regia (75°C, 20–25min). Platinum adsorption was influenced by the presence of other metals which form chlorocomplexes (tin, indium) and also base metals (aluminum). However, it was possible to overcome this fact by a sequential desorption procedure. Aluminum was selectively removed from the resins by elution with 3molL⁻¹ HCl. Platinum was desorbed passing 1molL⁻¹ Na₂S₂O₃ (pH 9). Tin was removed by elution with 0.1molL⁻¹ ascorbic acid. Indium was removed using 0.1molL⁻¹ EDTA as eluent. Desorption efficiency exceeded 99% for all metals. Metals were recovered in high yields (>98wt%).
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